James Alexander

The new detector for data recording by the CLEO collaboration at the Cornell Electron Storage Ring is described. This detector has been designed to optimize studying e+ e− annihilation into hadronic matter at a total energy of 10 GeV. It consists of high precesion charged particle tracking chambers and an electromagnetic calorimeter together with systems for particle identification. The design of the detector and its performance over the first year and a half of operation are presented.

Using the CLEO II detector, we have measured the differential cross sections for exclusive two-photon production of light pseudoscalar mesons ${\ensuremath{\pi}}^{0},$ \ensuremath{\eta}, and ${\ensuremath{\eta}}^{\ensuremath{'}}.$ From our measurements we have obtained the form factors associated with the electromagnetic transitions ${\ensuremath{\gamma}}^{*}\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}\mathrm{meson}.$ We have measured these form factors in the momentum transfer ranges from 1.5 to 9, 20, and $30{\mathrm{GeV}}^{2}$ for ${\ensuremath{\pi}}^{0},$ \ensuremath{\eta}, and ${\ensuremath{\eta}}^{\ensuremath{'}},$ respectively, and have made comparisons to various theoretical predictions.

We present the results of a study of muon pairs with invariant masses greater than 4.05 GeV/${c}^{2}$ produced in high-energy pion-nucleon interactions. The production cross section together with the inferred pion and nucleon structure functions are reported and compared with other experiments and with QCD predictions. The transverse-momentum distributions are also presented. Finally, the full angular distribution in cos\ensuremath{\theta} and \ensuremath{\varphi} is given as a function of mass, Feynman x, and transverse momentum. Longitudinal photon polarization is seen in the lower portion of the mass range at high ${x}_{\ensuremath{\pi}}$. This result is compared with a higher-twist model.

Electric drive systems, which include electric machines and power electronics, are a key enabling technology for advanced vehicle propulsion systems that reduce the petroleum dependence of the ground transportation sector. To have significant effect, electric drive technologies must be economical in terms of cost, weight, and size while meeting performance and reliability expectations. This paper will provide details of the design, analysis, and testing of an advanced interior permanent magnet (PM) machine that was developed to meet the FreedomCAR 2020 specifications. The 12-slot/10-pole machine has segmented stator structure equipped with fractional-slot nonoverlapping concentrated windings. The rotor has a novel spoke structure/assembly. Several prototypes with different thermal management schemes have been built and tested. This paper will cover the test results for all these prototypes and highlight the tradeoffs between the various schemes. Due to the high machine frequency (~1.2 kHz at the top speed), detailed analysis of various loss components and ways to reduce them will be presented. In addition, due to the high coolant inlet temperature and the fact that the machine is designed to continuously operate at 180 °C, detailed PM demagnetization analysis will be presented. The key novelty in this paper is the advanced rotor structure and the thermal management schemes.

Using data collected with the CLEO detector operating at the CESR e+e- collider at sqrt[s]=3.97-4.26 GeV, we investigate 15 charmonium decay modes of the psi(4040), psi(4160), and Y(4260) resonances. We confirm, at 11 sigma significance, the BABAR Y(4260)-->pi+pi- J/psi discovery, make the first observation of Y(4260)--> pi(0)pi(0) J/psi (5.1 sigma), and find the first evidence for Y(4260)-->K+K- J/psi(3.7 sigma). We measure e+e- cross sections at sqrt[s]=4.26 GeV as sigma(pi+pi- J/psi)=58(+12)(-10)+/-4 pb, sigma(pi(0)pi(0) J/psi)=23(+12)(-8)+/-1 pb, and sigma(K+K- J/psi)=9(+9)(-5)+/-1 pb, in which the uncertainties are statistical and systematic, respectively. Upper limits are placed on other decay rates from all three resonances.

We report the first evidence of charmless semileptonic decays of B mesons. In the momentum interval 2.4–2.6 GeV/c where the background from b→clν is negligible, the average of the measured b→ueν and b→uμν partial branching ratios is ΔBub(2.4,2.6) =(1.8±0.4±0.3)×10−4. Inclusion of data from the interval 2.2–2.4 GeV/c, where the lepton yield is dominated by b→clν, gives ΔBub(2.2,2.6) =(3.3±0.8±0.8)×10−4. ‖Vub/Vcb‖ depends on the theoretical model of b→ulν decay and is approximately 0.1.Received 8 November 1989DOI:https://doi.org/10.1103/PhysRevLett.64.16©1990 American Physical Society

Using $13.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data taken in the $\ensuremath{\Upsilon}(1S\ensuremath{-}4S)$ region with the CLEO III detector at the CESR collider, a search has been made for the new resonance $Y(4260)$ recently reported by the BABAR Collaboration. The production of $Y(4260)$ in initial state radiation (ISR), and its decay into ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$, are confirmed. A good quality fit to our data is obtained with a single resonance. We determine $M(Y(4260))=({4284}_{\ensuremath{-}16}^{+17}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4(\mathrm{syst}))\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, $\ensuremath{\Gamma}(Y(4260))=({73}_{\ensuremath{-}25}^{+39}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}5(\mathrm{syst}))\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, and ${\ensuremath{\Gamma}}_{ee}(Y(4260))\ifmmode\times\else\texttimes\fi{}\mathcal{B}(Y(4260)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi})=({8.9}_{\ensuremath{-}3.1}^{+3.9}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.8(\mathrm{syst}))\text{ }\text{ }\mathrm{eV}/{c}^{2}$.

Interior permanent magnet (PM) machines are considered the state of the art for traction motors, particularly in light-duty hybrid and electrical vehicles. These motors usually use neodymium-iron-boron (NdFeB) PMs. These magnets include both light rare-earth materials such as neodymium (Nd) as well as heavy rare-earth materials such as dysprosium (Dy). The main purpose of Dy is to enhance the magnet coercivity to avoid demagnetization under both high temperatures as well as flux weakening. One of the key risks in terms of using these rare-earth magnets is the significant fluctuation/increase in their prices over the past few years. Applications that use large quantities of these magnets, such as traction motors and wind generators, are the most affected by these fluctuations. There has been an ongoing global effort to try to reduce or eliminate the use of rare-earth materials (particularly Dy which is the most expensive) without sacrificing too much performance. This paper will focus on advanced spoke designs targeting traction applications. The goal of this paper is to come up with new spoke designs using various grades of Dy-free magnets as well as ferrites targeting the same set of specifications. This paper will provide a detailed comparison between the various designs highlighting the key tradeoffs in terms of power density, efficiency, flux-weakening capability, and magnet susceptibility to demagnetization. Also, a prototype using ferrites has been built and tested, and the experimental results will be presented.

The CMS detector team describes their experiment and observation of decay products from a standard model Higgs boson, allowing its mass to be determined.

There has been growing interest in electrical machines that reduce or eliminate rare-earth material content. Traction applications are among the key applications where reducing cost and, hence, reduction of rare-earth materials are key requirements. This paper will assess the potential of different variants of flux-switching machines (FSMs) that either reduce or eliminate rare-earth materials in the context of traction applications. Two designs use different grades of dysprosium-free permanent magnets (PMs), and the third design is a wound-field variant that does not include PMs at all. A detailed analysis of all three designs in comparison to the required set of specifications will be presented. The key opportunities and challenges will be highlighted. The impact of the high pole-count/frequency of the FSMs will also be evaluated. Experimental results for one of the designs with dysprosium-free PMs will also be presented.

We present the first measurement of the D*+ width using 9/fb of e+ e- data collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical size of the CESR beam spot to measure the energy release distribution from the D*+ -> D0 pi+ decay. We find Gamma(D*+) = 96 +- 4 (Statistical) +- 22 (Systematic) keV. We also measure the energy release in the decay and compute Delta m = m(D*+) - m(D0) = 145.412 +- 0.002 (Statistical) +- 0.012 (Systematic) MeV/c^2

We have measured the mass of the Z boson to be 91.11±0.23 GeV/c2, and its width to be 1.61+0.60−0.43 GeV. If we constrain the visible width to its standard-model value, we find the partial width to invisible decay modes to be 0.62±0.23 GeV, corresponding to 3.8±1.4 neutrino species.Received 24 July 1989DOI:https://doi.org/10.1103/PhysRevLett.63.724©1989 American Physical Society

We have studied exclusive, radiative B meson decays to charmless mesons in 9.7x10(6) B&Bmacr; decays accumulated with the CLEO detector. We measure B(B0-->K(*0)(892)gamma) = (4.55(+0.72)(-0. 68)+/-0.34)x10(-5) and B(B+-->K(*+)(892)gamma) = (3.76(+0.89)(-0. 83)+/-0.28)x10(-5). We have searched for CP asymmetry in B-->K(*)(892)gamma decays and measure A(CP) = +0.08+/-0.13+/-0.03. We report the first observation of B-->K(*)(2)(1430)gamma decays with a branching fraction of (1.66(+0.59)(-0.53)+/-0.13)x10(-5). No evidence for the decays B-->rhogamma and B0-->omegagamma is found and we limit B(B-->(rho/omega)gamma)/B(B-->K(*)(892)gamma)<0.32 at 90% C.L.

We use data collected with the CLEO II detector to perform a high-statistics measurement of the resonant substructure in ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ decays. We find that the Dalitz plot is well represented by a combination of seven quasi-two-body decay channels $[{K}^{*0}{\ensuremath{\pi}}^{0},{K}^{\ensuremath{-}}\ensuremath{\rho},{K}^{*\ensuremath{-}}{\ensuremath{\pi}}^{+},{K}_{0}{(1430)}^{\ensuremath{-}}{\ensuremath{\pi}}^{+},{K}_{0}{(1430)}^{0}{\ensuremath{\pi}}^{0},{K}^{\ensuremath{-}}{\ensuremath{\rho}}^{+}(1700),$ and ${K}^{*}{(1680)}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}],$ plus a small non-resonant component. We see no evidence of a scalar $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\kappa}}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ resonance in the mass range recently reported by other groups. Using the amplitudes and phases from this analysis, we calculate an integrated $\mathrm{CP}$ asymmetry of $\ensuremath{-}0.031\ifmmode\pm\else\textpm\fi{}0.086.$

Using $281\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at the $\ensuremath{\psi}(3770)$ resonance with the CLEO-c detector at CESR (Cornell Electron Storage Ring), we determine absolute hadronic branching fractions of charged and neutral $D$ mesons using a double tag technique. Among measurements for three ${D}^{0}$ and six ${D}^{+}$ modes, we obtain reference branching fractions $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(3.891\ifmmode\pm\else\textpm\fi{}0.035\ifmmode\pm\else\textpm\fi{}0.059\ifmmode\pm\else\textpm\fi{}0.035)%$ and $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})=(9.14\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.07)%$, where the first uncertainty is statistical, the second is all systematic errors other than final-state radiation (FSR), and the third is the systematic uncertainty due to FSR. We include FSR in these branching fractions by allowing for additional unobserved photons in the final state. Using an independent determination of the integrated luminosity, we also extract the cross sections $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{\overline{D}}^{0})=(3.66\ifmmode\pm\else\textpm\fi{}0.03\ifmmode\pm\else\textpm\fi{}0.06)\text{ }\text{ }\mathrm{nb}$ and $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}})=(2.91\ifmmode\pm\else\textpm\fi{}0.03\ifmmode\pm\else\textpm\fi{}0.05)\text{ }\text{ }\mathrm{nb}$ at a center-of-mass energy, ${E}_{\mathrm{cm}}=3774\ifmmode\pm\else\textpm\fi{}1\text{ }\text{ }\mathrm{MeV}$.

We extract a relatively precise value for the decay constant of the ${D}^{+}$ meson by measuring $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu})=(4.40\ifmmode\pm\else\textpm\fi{}{0.66}_{\ensuremath{-}0.12}^{+0.09})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ using $281\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of data taken on the $\ensuremath{\psi}(3770)$ resonance with the CLEO-$c$ detector. We find ${f}_{{D}^{+}}=(222.6\ifmmode\pm\else\textpm\fi{}{16.7}_{\ensuremath{-}3.4}^{+2.8})\text{ }\text{ }\mathrm{MeV}$, and compare with current theoretical calculations. We also set a 90% confidence upper limit on $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu})&lt;2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ which constrains new physics models.

Using $20.7\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data taken at $\sqrt{s}=3.671\text{ }\text{ }\mathrm{GeV}$ with the $\mathrm{CLEO}\mathrm{\text{\ensuremath{-}}}c$ detector, precision measurements of the electromagnetic form factors of the charged pion, charged kaon, and proton have been made for timelike momentum transfer of $|{Q}^{2}|=13.48\text{ }\text{ }{\mathrm{GeV}}^{2}$ by the reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{+}{h}^{\ensuremath{-}}$. The measurements are the first ever with identified pions and kaons of $|{Q}^{2}|&gt;4\text{ }\text{ }{\mathrm{GeV}}^{2}$, with the results ${F}_{\ensuremath{\pi}}(13.48\text{ }\text{ }{\mathrm{GeV}}^{2})=0.075\ifmmode\pm\else\textpm\fi{}0.008(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.005(\mathrm{syst})$ and ${F}_{K}(13.48\text{ }\text{ }{\mathrm{GeV}}^{2})=0.063\ifmmode\pm\else\textpm\fi{}0.004(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.001(\mathrm{syst})$. The result for the proton, assuming ${G}_{E}^{p}={G}_{M}^{p}$, is ${G}_{M}^{p}(13.48\text{ }\text{ }{\mathrm{GeV}}^{2})=0.014\ifmmode\pm\else\textpm\fi{}0.002(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.001(\mathrm{syst})$, which is in agreement with earlier results.

Using the entire CLEO-c ψ(3770)→DD¯ event sample, corresponding to an integrated luminosity of 818 pb−1 and approximately 5.4×106 DD¯ events, we present a study of the decays D0→π−e+νe, D0→K−e+νe, D+→π0e+νe, and D+→K¯0e+νe. Via a tagged analysis technique, in which one D is fully reconstructed in a hadronic mode, partial rates for semileptonic decays by the other D are measured in several q2 bins. We fit these rates using several form factor parametrizations and report the results, including form factor shape parameters and the branching fractions B(D0→π−e+νe)=(0.288±0.008±0.003)%, B(D0→K−e+νe)=(3.50±0.03±0.04)%, B(D+→π0e+νe)=(0.405±0.016±0.009)%, and B(D+→K¯0e+νe)=(8.83±0.10±0.20)%, where the first uncertainties are statistical and the second are systematic. Taking input from lattice quantum chromodynamics, we also find |Vcd|=0.234±0.007±0.002±0.025 and |Vcs|=0.985±0.009±0.006±0.103, where the third uncertainties are from lattice quantum chromodynamics.4 MoreReceived 16 June 2009DOI:https://doi.org/10.1103/PhysRevD.80.032005©2009 American Physical Society

CLEO has studied B decays to πℓν, ρℓν, and ωℓν, where ℓ=eorμ, by incorporating the missing momentum into full B reconstruction. With the B0 and B+ modes combined according to isospin predictions for the relative partial widths, we obtain B(B0→π−ℓ+ν)=(1.8±0.4±0.3±0.2)×10−4 and B(B0→ρ−ℓ+ν)=(2.5±0.4+0.5−0.7±0.5)×10−4, where the errors are statistical, systematic, and the estimated model dependence. We also estimate |Vub|=(3.3±0.2+0.3−0.4±0.7)×10−3.Received 1 July 1996DOI:https://doi.org/10.1103/PhysRevLett.77.5000©1996 American Physical Society

Multihadronic e+e− annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q2-Q1, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p⊥, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e+e− data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z0, are also presented.Received 14 May 1987DOI:https://doi.org/10.1103/PhysRevD.37.1©1988 American Physical Society

Using the CLEO-c detector at the Cornell Electron Storage Ring, we have measured inclusive and exclusive cross sections for the production of D+, D0 and Ds+ mesons in e+e- annihilations at thirteen center-of-mass energies between 3.97 and 4.26 GeV. Exclusive cross sections are presented for final states consisting of two charm mesons (DD, D*D, D*D*, Ds+Ds-, Ds*+Ds-, and Ds*+Ds*-) and for processes in which the charm-meson pair is accompanied by a pion. No enhancement in any final state is observed at the energy of the Y(4260).

We report the first determination of the relative strong-phase difference between ${D}^{0}\ensuremath{\rightarrow}{K}_{S,L}^{0}{K}^{+}{K}^{\ensuremath{-}}$ and ${\overline{D}}^{0}\ensuremath{\rightarrow}{K}_{S,L}^{0}{K}^{+}{K}^{\ensuremath{-}}$. In addition, we present updated measurements of the relative strong-phase difference between ${D}^{0}\ensuremath{\rightarrow}{K}_{S,L}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\overline{D}}^{0}\ensuremath{\rightarrow}{K}_{S,L}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. Both measurements exploit the quantum coherence between a pair of ${D}^{0}$ and ${\overline{D}}^{0}$ mesons produced from $\ensuremath{\psi}(3770)$ decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle $\ensuremath{\gamma}/{\ensuremath{\phi}}_{3}$ in ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\stackrel{\texttildelow{}}{D}}^{0}$ decays, where ${\stackrel{\texttildelow{}}{D}}^{0}$ is a ${D}^{0}$ or ${\overline{D}}^{0}$ meson decaying to ${K}_{S}^{0}{h}^{+}{h}^{\ensuremath{-}}$ ($h=\ensuremath{\pi}$, $K$), in a manner independent of the model assumed to describe the ${D}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{h}^{+}{h}^{\ensuremath{-}}$ decay. Using our results, the uncertainty in $\ensuremath{\gamma}/{\ensuremath{\phi}}_{3}$ due to the error on the strong-phase difference is expected to be between 1.7\ifmmode^\circ\else\textdegree\fi{} and 3.9\ifmmode^\circ\else\textdegree\fi{} for an analysis using ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\stackrel{\texttildelow{}}{D}}^{0}$, ${\stackrel{\texttildelow{}}{D}}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays, and between 3.2\ifmmode^\circ\else\textdegree\fi{} and 3.9\ifmmode^\circ\else\textdegree\fi{} for an analysis based on ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\stackrel{\texttildelow{}}{D}}^{0}$, ${\stackrel{\texttildelow{}}{D}}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+}{K}^{\ensuremath{-}}$ decays. A measurement is also presented of the $CP$-odd fraction, ${\mathcal{F}}_{\ensuremath{-}}$, of the decay ${D}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+}{K}^{\ensuremath{-}}$ in the region of the $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ resonance. We find that in a region within $0.01\text{ }\text{ }{\mathrm{GeV}}^{2}/{c}^{4}$ of the nominal $\ensuremath{\phi}$ mass squared ${\mathcal{F}}_{\ensuremath{-}}&gt;0.91$ at the 90% confidence level.

We measure the branching ratio of the purely leptonic decay of the D+ meson with unprecedented precision as B(D+ -> mu+ nu) = (3.82 +/- 0.32 +/- 0.09)x10^(-4), using 818/pb of data taken on the psi(3770) resonance with the CLEO-c detector at the CESR collider. We use this determination to derive a value for the pseudoscalar decay constant fD+, combining with measurements of the D+ lifetime and assuming |Vcd| = |Vus|. We find fD+ = (205.8 +/- 8.5 +/- 2.5) MeV. The decay rate asymmetry [B(D+ -> mu+ nu)-B(D- -> mu- nu)]/[B(D+ -> mu+ nu)+B(D- -> mu- nu)] = 0.08 +/- 0.08, consistent with no CP violation. We also set 90% confidence level upper limits on B(D+ -> tau+ nu) < 1.2x10^(-3) and B(D+ -> e+ nu) < 8.8x10^(-6).

General Electric, under contract with the Air Force Research Labs (AFRL), has successfully developed and tested a high speed, multimegawatt superconducting generator. The generator was built to demonstrate high temperature superconducting (HTS) generator technology for application in a high power density Multimegawatt Electric Power System (MEPS) for the Air Force. The demonstration tested the generator under load conditions up to 1.3 MW at over 10,000 rpm. The new MEPS generator achieved 97% efficiency including cryocooler losses. All test results indicate that the generator has a significant margin over the test points and that its performance is consistent with program specifications. This demonstration is the first successful full-load test of a superconducting generator for the Air Force. In this paper we describe the development of the generator and present some key test results used to validate the design. Extrapolation to a higher power density generator is also discussed.

While interior permanent magnet (IPM) machines have been considered the state-of-the art for traction motors, synchronous reluctance (SynRel) motors with advanced materials can provide a competitive alternative. IPM machines typically utilize neodymium iron boron permanent magnets, which pose an issue in terms of price, sustainability, demagnetization at higher operating temperatures, and uncontrolled generation. On the other hand, SynRel machines do not contain any magnets and are free from these issues. However, the absence of magnets as well the presence of bridges and center post limit the flux-weakening capability of a SynRel machine and limit the achievable constant power speed ratio for a given power converter rating. In this paper, a new material referred to as the dual-phase magnetic material will be evaluated for SynRel designs. This material allows for nonmagnetic regions to be selectively introduced in the bridge and post regions, thereby eliminating one of the key limitations of the SynRel designs in terms of torque density and flux weakening. This paper will focus on advanced SynRel designs utilizing dual-phase material targeting traction applications. The paper will provide a detailed comparison between a dual-phase SynRel design, a conventional SynRel design, and a spoke PM design with rare-earth-free magnets. It will highlight the key tradeoffs in terms of power density, efficiency, and flux-weakening capability.

In e(+)e(-) collisions using the CLEO detector, we have studied the decay of the D0 to the final state K(0)(S)pi(+)pi(-) with the initial flavor of the D0 tagged by the decay D(*+)-->D0pi(+). We use the Dalitz technique to measure the resonant substructure in this final state and clearly observe ten different contributions by fitting for their amplitudes and relative phases. We observe a K(*)(892)(+)pi(-) component which arises from doubly Cabibbo suppressed decays or D0-D0; mixing.

Based on a sample corresponding to 4.3 million produced tau-pair events, we have studied hadronic dynamics in the decay tau- --> nu_tau pi- pi0 pi0 in data recorded by the CLEO II detector operating at the CESR e+e- collider. The decay is dominated by the process tau --> nu_tau a_1(1260), with the a_1 meson decaying to three pions predominantly via the lowest dimensional (mainly S-wave) a_1 --> rho pi Born amplitude. From fits to the Dalitz plot and angular observables, we find significant additional contributions from amplitudes for a_1 decay to sigma pi, f_0(1370) pi and f_2(1270) pi, as well as higher dimensional a_1 --> rho pi and rho' pi amplitudes. The squared sigma pi amplitude accounts for ~15% of the total tau- --> nu_tau pi- pi0 pi0 rate in the models considered. We have searched for additional contributions from tau --> nu_tau pi'(1300). We place 90% confidence level upper limits on the branching fraction for this channel of between 1.0*10^{-4} and 1.9*10^{-4}, depending on the pi' decay mode. The pi- pi0 pi0 mass spectrum is parametrized by a Breit-Wigner form with a mass-dependent width which is specified according to the results of the Dalitz plot fits plus a coupling to an a_1 --> K* K amplitude. From a chi^2 fit, we extract the pole mass and width of the a_1, as well as the magnitude of the K* K coupling. We have also investigated the impact of a possible contribution from the a_1'(1700) meson on this spectrum. Finally, exploiting the parity-violating angular asymmetry in a_1 --> 3pi decay, we determine the signed value of the tau neutrino helicity to be h_{\nu_\tau} = -1.02 +- 0.13(stat.) +- 0.03(syst.+model), confirming the left-handedness of the tau neutrino.

We have searched for two-body charmless hadronic decays of $B$ mesons. Final states include $ππ$, $K π$, and $KK$ with both charged and neutral kaons and pions; $πρ$, $K ρ$, and $K^*π$; and $Kϕ$, $ K^*ϕ$, and $ϕϕ$. The data used in this analysis consist of 2.6~million $B\bar{B}$~pairs produced at the $Υ(4S)$ taken with the CLEO-II detector at the Cornell Electron Storage Ring (CESR). We measure the branching fraction of the sum of $B^0 \rightarrow π^+π^-$ and $B^0 \rightarrow K^+π^-$ to be $(1.8^{+0.6+0.2}_{-0.5-0.3}\pm0.2) \times 10^{-5}$. In addition, we place upper limits on individual branching fractions in the range from $10^{-4}$ to $10^{-6}$.

We study the exclusive semileptonic B meson decays ${\mathit{B}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}0}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{} and B${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}+}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{} using data collected with the CLEO II detector at the Cornell Electron-positron Storage Ring (CESR). We present measurements of the branching fractions scrB(B${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}+}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{})= (0.5/${\mathit{f}}_{00}$)[4.49\ifmmode\pm\else\textpm\fi{}0.32(stat.)\ifmmode\pm\else\textpm\fi{}0.39 (syst.)]% and scrB(${\mathit{B}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}0}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$(\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{})= (0.5/${\mathit{f}}_{+\mathrm{\ensuremath{-}}}$)[5.13\ifmmode\pm\else\textpm\fi{}0.54 (stat) \ifmmode\pm\else\textpm\fi{}0.64 (syst)]%, where ${\mathit{f}}_{00}$ and ${\mathit{f}}_{+\mathrm{\ensuremath{-}}}$ are the neutral and charged B meson production fractions at the \ensuremath{\Upsilon}(4S) resonance, respectively. Assuming isospin invariance and taking the ratio of charged to neutral B meson lifetimes measured at higher energy machines, we determine the ratio ${\mathit{f}}_{+\mathrm{\ensuremath{-}}}$/${\mathit{f}}_{00}$=1.04\ifmmode\pm\else\textpm\fi{}0.13 (stat) \ifmmode\pm\else\textpm\fi{}0.12 (syst) \ifmmode\pm\else\textpm\fi{}0.10 (lifetime); further assuming ${\mathit{f}}_{+\mathrm{\ensuremath{-}}}$+${\mathit{f}}_{00}$=1 we also determine the partial width \ensuremath{\Gamma}(B\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}}$l\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{})=[29.9\ifmmode\pm\else\textpm\fi{}1.9 (stat) \ifmmode\pm\else\textpm\fi{}2.7 (syst.) \ifmmode\pm\else\textpm\fi{}2.0 (lifetime)] ${\mathrm{ns}}^{\mathrm{\ensuremath{-}}1}$ (independent of ${\mathit{f}}_{+\mathrm{\ensuremath{-}}}$/${\mathit{f}}_{00}$).From this partial width we calculate B\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}}$l\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{} branching fractions that do not depend on ${\mathit{f}}_{+\mathrm{\ensuremath{-}}}$/${\mathit{f}}_{00}$ or the individual B lifetimes, but only on the charged to neutral B lifetime ratio. The product of the CKM matrix element \ensuremath{\Vert}${\mathit{V}}_{\mathit{c}\mathit{b}}$\ensuremath{\Vert} times the normalization of the decay form factor at the point of no recoil of the ${\mathit{D}}^{\mathrm{*}}$ meson, scrF(y=1), is determined from a linear fit to the combined differential decay rate of the exclusive B\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}${\mathit{D}}^{\mathrm{*}}$l\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{} decays: \ensuremath{\Vert}${\mathit{V}}_{\mathit{c}\mathit{b}}$\ensuremath{\Vert}scrF(1)=0.0351\ifmmode\pm\else\textpm\fi{}0.0019 (stat) \ifmmode\pm\else\textpm\fi{}0.0018 (syst) \ifmmode\pm\else\textpm\fi{}0.0008 (lifetime). The value for \ensuremath{\Vert}${\mathit{V}}_{\mathit{c}\mathit{b}}$\ensuremath{\Vert} is extracted using theoretical calculations of the form factor normalization.

We have studied the "wrong-sign" process D0-->K+pi(-) to search for D0-&Dmacr;( 0) mixing. The data come from 9.0 fb(-1) of e(+)e(-) collisions at sqrt[s] approximately 10 GeV recorded with the CLEO II. V detector. We measure the relative rate of the wrong-sign process D0-->K+pi(-) to the Cabibbo-favored process &Dmacr;( 0)-->K+pi(-) to be R = (0.332(+0.063)(-0.065)+/-0.040)%. We study D0-->K+pi(-) as a function of decay time to distinguish direct doubly Cabibbo-suppressed decay from D0-&Dmacr;( 0) mixing. The amplitudes that describe D0-&Dmacr;( 0) mixing, x(') and y('), are consistent with zero. At the 95% C.L. and without assumptions concerning charge-parity ( CP) violating parameters, we find (1/2)x('2)<0.041% and -5.8%<y(')<1.0%.

In a sample of 19 million produced B mesons, we have observed the decays B -> eta K* and improved our previous measurements of B -> eta'K. The branching fractions we measure for these decay modes are BR(B+ -> eta K*+) = (26.4 +9.6-8.2 +- 3.3) x $10^{-6}$, BR(B0 -> eta K*0) = (13.8 +5.5-4.6 +- 1.6) x $10^{-6}$, BR(B+ -> eta' K+) = (80 +10-9 +- 7) x $10^{-6}$ and BR(B0 -> eta' K0) = (89 +18-16 +- 9) x $10^{-6}$. We have searched with comparable sensitivity for related decays and report upper limits for these branching fractions.

Using the CLEO II detector and a sample of 955 000 Υ(4S) decays we have confirmed charmless semileptonic decays of B mesons. In the momentum interval 2.3–2.6 GeV/c we observe an excess of 107±15±11 leptons, which we attribute to b→ulν. This result yields a model-dependent range of values for ‖Vub/Vcb‖ that is lower than has been obtained in previous studies. For the inclusive spectator model of Altarelli et al. we find ‖Vub/Vcb‖=0.076±0.008. Models that describe b→ulν with a limited set of exclusive final states give ‖Vub/Vcb‖=0.06-0.10.Received 7 September 1993DOI:https://doi.org/10.1103/PhysRevLett.71.4111©1993 American Physical Society

We report a measurement of the ${\mathit{D}}^{\mathrm{*}+}$ and ${\mathit{D}}^{\mathrm{*}0}$ decay branching fractions based on 780 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ of data collected with the CLEO II detector. For radiative ${\mathit{D}}^{\mathrm{*}+}$ decay, we obtain an upper limit, scrB(${\mathit{D}}^{\mathrm{*}+}$\ensuremath{\rightarrow}${\mathit{D}}^{+}$\ensuremath{\gamma})4.2% (90% confidence level), which is substantially below previous results, and eliminates the need for an anomalously large charm quark magnetic moment.

We report on the observation of the ηc′(2S01), the radial excitation of the ηc(1S01) ground state of charmonium, in the two-photon fusion reaction γγ→ηc′→KS0K±π∓ in 13.6 fb−1 of CLEO II/II.V data and 13.1 fb−1 of CLEO III data. We obtain M(ηc′)=3642.9±3.1(stat)±1.5(syst) MeV and M(ηc)=2981.8±1.3(stat)±1.5(syst) MeV. The corresponding values of hyperfine splittings between S01 and S13 states are ΔMhf(1S)=115.1±2.0 MeV and ΔMhf(2S)=43.1±3.4 MeV. Assuming that the ηc and ηc′ have equal branching fractions to KSKπ, we obtain Γγγ(ηc′)=1.3±0.6 keV.Received 23 December 2003DOI:https://doi.org/10.1103/PhysRevLett.92.142001©2004 American Physical Society

We present final measurements of 13 charmless hadronic B decay modes from the CLEO experiment. The decay modes include the ten ππ, Kπ, and KK final states and new limits on dibaryonic final states, p¯p, p¯Λ, and Λ¯Λ, as well as a new determination of the ratio B(→BDK)/B(→BDπ). The results are based on the full CLEO II and CLEO III data samples totalling 15.3fb−1 at the Υ(4S), and supercede previously published results.Received 13 February 2003Corrected 6 June 2007DOI:https://doi.org/10.1103/PhysRevD.68.052002©2003 American Physical Society

Using $55.8\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at the $\ensuremath{\psi}(3770)$ resonance with the CLEO-c detector at CESR, we determine absolute hadronic branching fractions of charged and neutral $D$ mesons using a double tag technique. Among measurements for three ${D}^{0}$ and six ${D}^{+}$ modes, we obtain reference branching fractions $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(3.91\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.09)%$ and $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})=(9.5\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\pm\else\textpm\fi{}0.3)%$, where the uncertainties are statistical and systematic, respectively. Final state radiation is included in these branching fractions by allowing for additional, unobserved, photons in the final state. Using a determination of the integrated luminosity, we also extract the cross sections $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{\overline{D}}^{0})=(3.60\ifmmode\pm\else\textpm\fi{}{0.07}_{\ensuremath{-}0.05}^{+0.07})\text{ }\text{ }\mathrm{nb}$ and $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}})=(2.79\ifmmode\pm\else\textpm\fi{}{0.07}_{\ensuremath{-}0.04}^{+0.10})\text{ }\text{ }\mathrm{nb}$.

We search for a non-SM-like CP-odd Higgs boson (a(1)(0)) decaying to tau(+)tau(-) or mu(+)mu(-) in radiative decays of the Upsilon(1S). No significant signal is found, and upper limits on the product branching ratios are set. Our tau(+)tau(-) results are almost 2 orders of magnitude more stringent than previous upper limits. Our data provide no evidence for a Higgs state with a mass of 214 MeV decaying to mu(+)mu(-), previously proposed as an explanation for 3 Sigma(+)-->pmu(+)mu(-) events observed by the HyperCP experiment. Our results constrain NMSSM models.

The decays of $\ensuremath{\psi}(2S)$ into $\ensuremath{\gamma}p\overline{p}$, ${\ensuremath{\pi}}^{0}p\overline{p}$, and $\ensuremath{\eta}p\overline{p}$ have been studied with the CLEO-c detector using a sample of $24.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(2S)$ events obtained from ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at $\sqrt{s}=3686\text{ }\text{ }\mathrm{MeV}$. The data show evidence for the excitation of several ${N}^{*}$ resonances in $p{\ensuremath{\pi}}^{0}$ and $p\ensuremath{\eta}$ channels in ${\ensuremath{\pi}}^{0}p\overline{p}$ and $\ensuremath{\eta}p\overline{p}$ decays, and ${f}_{2}$ states in $\ensuremath{\gamma}p\overline{p}$ decay. Branching fractions for decays of $\ensuremath{\psi}(2S)$ to $\ensuremath{\gamma}p\overline{p}$, ${\ensuremath{\pi}}^{0}p\overline{p}$, and $\ensuremath{\eta}p\overline{p}$ have been determined. No evidence for $p\overline{p}$ threshold enhancements was found in the reactions $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}Xp\overline{p}$, where $X=\ensuremath{\gamma}$, ${\ensuremath{\pi}}^{0}$, $\ensuremath{\eta}$. We do, however, find confirming evidence for a $p\overline{p}$ threshold enhancement in $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$ as previously reported by BES.

Using $2.45\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $\ensuremath{\psi}(2S)$ decays collected with the CLEO-c detector at the Cornell Electron Storage Ring we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure $\mathcal{B}\mathbf{(}\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}\mathbf{)}=(4.32\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.60)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, $\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c})/\mathcal{B}\mathbf{(}\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}\mathbf{)}=4.59\ifmmode\pm\else\textpm\fi{}0.23\ifmmode\pm\else\textpm\fi{}0.64$, and $\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c})=(1.98\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.30)%$. We observe a distortion in the ${\ensuremath{\eta}}_{c}$ line shape due to the photon-energy dependence of the magnetic dipole transition rate. We find that measurements of the ${\ensuremath{\eta}}_{c}$ mass are sensitive to the line shape, suggesting an explanation for the discrepancy between measurements of the ${\ensuremath{\eta}}_{c}$ mass in radiative transitions and other production mechanisms.

We report the measurement of the transverse momentum dependence of inclusive J/psi polarization in p+p collisions at sqrt(s)=200 GeV performed by the PHENIX Experiment at RHIC. The polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for p_T < 5 GeV/c and |y| < 0.35. The J/psi polarization in the helicity and Gottfried-Jackson frames is consistent with zero for all transverse momenta, with a slight (1.8 sigma) trend towards longitudinal polarization for transverse momenta above 2 GeV/c. No conclusion is allowed due to the limited acceptance in the Collins-Soper frame and the uncertainties of the current data. The results are compared to observations for other collision systems and center of mass energies and to different quarkonia production models.

We report evidence for the ground state of bottomonium, eta_b(1S), in the radiative decay Upsilon(3S) --> gamma eta_b in e^+e^- annihilation data taken with the CLEO III detector. Using 6 million Upsilon(3S) decays, and assuming Gamma(eta_b) = 10 MeV/c^2, we obtain B(Upsilon(3S) --> gamma eta_b) = (7.1 +- 1.8 +- 1.1) X 10^{-4}, where the first error is statistical and the second is systematic. The statistical significance is about 4 sigma. The mass is determined to be M(eta_b) = 9391.8 +- 6.6 +- 2.0 MeV/c^2, which corresponds to the hyperfine splitting Delta M_{hf}(1S)_b = 68.5 +- 6.6 +- 2.0 MeV/c^2. Using 9 million Upsilon(2S) decays, we place an upper limit on the corresponding Y(2S) decay, B(Y(2S) --> gamma eta_b) < 8.4 X 10^{-4} at 90 % confidence level.

We perform a Dalitz plot analysis of about 100,000 Ds+ decays to K+ K- pi+ and measure the complex amplitudes of the intermediate resonances which contribute to this decay mode. We also measure the relative branching fractions of Ds+ --> K+ K+ pi- and Ds+ --> K+ K+ K-. For this analysis we use a 384 fb-1 data sample, recorded by the BABAR detector at the PEP-II asymmetric-energy e+e- collider running at center-of-mass energies near 10.58 GeV.

While interior permanent magnet (IPM) machines have been considered state of the art for traction motors, synchronous reluctance (SynRel) motors with advanced materials can provide a competitive alternative. IPM machines typically utilize neodymium iron boron permanent magnets, which pose an issue in terms of price, sustainability, demagnetization at higher operating temperatures, and uncontrolled generation. On the other hand, SynRel machines do not contain any magnets and are free from these issues. However, the absence of magnets as well as the presence of bridges and centerposts limit the flux-weakening capability of a SynRel machine, and limit the achievable constant power speed ratio without having to significantly oversize the machine and/or the power converter. In this paper, a new material referred to as the dual-phase magnetic material, where nonmagnetic regions can be selectively introduced within each lamination, will be evaluated for SynRel designs. The dual-phase feature of this material enables nonmagnetic bridges and posts, eliminating one of the key limitations of the SynRel designs in terms of torque density and flux weakening. This paper will present the design, analysis, and test results of an advanced proof-of-concept SynRel design utilizing dual-phase material with traction applications as the ultimate target application.

The COVID-19 pandemic affected tourists’ traveling behavior and resulted in the stoppage of Bali’s tourism growth. Hence, this study aimed to determine the factors that influence Indonesians to travel to Bali during the COVID-19 pandemic by utilizing the extended theory of planned behavior (TBP) approach. A total of 269 respondents participated in the survey and answered forty (40) questions developed from seven (7) latent variables. Structural equation modeling (SEM) specified that hedonic motivation had the highest direct effect on tourist traveling intention, followed by attitude, and COVID-19 safety protocols. Meanwhile, social media influence, perceived behavioral control, and subjective norms were insignificant to tourists’ intention to travel during the COVID-19 pandemic. These findings contributed to the proposed strategies that increased the number of local and international tourists. Since this study aimed to stabilize the tourism sector and improve the economy in Bali, the government and tourism stakeholders benefit from the results.

We report results of searches for charmless hadronic B meson decays to pseudoscalar( pi(+/-), K+/-, pi(0), or K(0)(S))-vector( rho, K(*), or omega) final states. By using 9.7x10(6) BB pairs collected with the CLEO detector, we report the first observation of B(-)--->pi(-)rho(0), B(0)-->pi(+/-)rho(-/+), and B(-)-->pi(-)omega, which are expected to be dominated by hadronic b-->u transitions. The measured branching fractions are (10.4(+3.3)(-3.4)+/-2.1)x10(-6), (27.6(+8.4)(-7.4)+/-4.2)x10(-6), and (11.3(+3.3)(-2.9)+/-1. 4)x10(-6), respectively. Branching fraction upper limits are set for all of the other decay modes investigated.

We have used the CLEO II detector and $2.06{\mathrm{fb}}^{\ensuremath{-}1}$ of $\ensuremath{\Upsilon}(4S)$ data to measure the $B$-meson semileptonic branching fraction. The $B\ensuremath{\rightarrow}\mathrm{Xe}\ensuremath{\nu}$ momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations in events with a high-momentum lepton tag and an additional electron. We find $B(B\ensuremath{\rightarrow}\mathrm{Xe}\ensuremath{\nu})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(10.49\ifmmode\pm\else\textpm\fi{}0.17\ifmmode\pm\else\textpm\fi{}0.43)%$, with overall systematic uncertainties less than those of untagged single-lepton measurements. We use this result to calculate the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element ${V}_{\mathrm{cb}}$ and to set an upper limit on the fraction of $\ensuremath{\Upsilon}(4S)$ decays to final states other than $B\overline{B}$.

We have studied charmless hadronic decays of $B$ mesons into two-body final states with kaons and pions and observe three new processes with the following branching fractions: $B(B\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({4.3}_{\ensuremath{-}1.4}^{+1.6}\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B(B\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({14.6}_{\ensuremath{-}5.1\ensuremath{-}3.3}^{+5.9+2.4})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and $B(B\ensuremath{\rightarrow}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({11.6}_{\ensuremath{-}2.7\ensuremath{-}1.3}^{+3.0+1.4})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also update our previous measurements for the decays $B\ensuremath{\rightarrow}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ and ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$.

We have measured the first and second moments of the hadronic mass-squared distribution in B -> X_c l nu, for P(lepton) > 1.5 GeV/c. We find <M_X^2 - M_D[Bar]^2> = 0.251 +- 0.066 GeV^2, < (M_X^2 -<M_X^2>)^2 > = 0.576 +- 0.170 GeV^4, where M_D[Bar] is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b -> s gamma, we find the HQET parameter lambda_1 (MS[Bar], to order 1/M^3 and beta_0 alpha_s^2) to be -0.24 +- 0.11 GeV^2. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain |V_cb| = 0.0404 +- 0.0013.

We have measured the B0B¯0 mixing probability, χd, using a sample of 965 000 BB¯ pairs from Υ(4S) decays. Counting dilepton events, we find χd=0.157±0.016±0.018−0.021+0.028. Using tagged B0 events, we find χd=0.149±0.023±0.019±0.010. The first (second) error is statistical (systematic). The third error reflects a ±15% uncertainty in the assumption, made in both cases, that charged and neutral B pairs contribute equally to dilepton events. We also obtain a limit on the CP impurity in the Bd0 system, ‖Re(εB0)‖<0.045 at 90% C.L.Received 29 April 1993DOI:https://doi.org/10.1103/PhysRevLett.71.1680©1993 American Physical Society

We report a new measurement of the CKM parameter V_ub made with a sample of 9.7 million B B-bar events collected with the CLEO II detector. Using Heavy Quark theory, we combine the observed yield of leptons from semileptonic B decay in the end-point momentum interval 2.2-2.6 GeV/c with recent CLEO II data on B --> X_s gamma to find |V_ub| = (4.08 +/- 0.34 +/- 0.44 +/- 0.16 +/- 0.24) x 10^-3, where the first two uncertainties are experimental and the last two are from theory.

We present measurements of spectral moments extracted from the invariant mass distributions of the final states of hadronic τ decay products recorded in the CLEO detector. From a fit of theoretical predictions to the measurements of spectral moments and the total hadronic decay width of the τ, we determine the strong coupling constant and a set of non-perturbative QCD parameters. The strong coupling constant is measured to be αs(mτ) = 0.306 ± 0.024, which when extrapolated to the Z mass, yields αs(Mz) = 0.114 ± 0.003.

We observe signals for the decays ψ(3770)→XJ/ψ from data acquired with the CLEO detector operating at the CESR e+e− collider with √s=3773 MeV. We measure the following branching fractions B(ψ(3770)→XJ/ψ) and significances: (189±20±20)×10−5 (11.6σ) for X=π+π−, (80±25±16)×10−5 (3.4σ) for X=π0π0, and (87±33±22)×10−5 (3.5σ) for X=η, where the errors are statistical and systematic, respectively. The radiative return process e+e−→γψ(2S) populates the same event sample and is used to measure Γee[ψ(2S)]=(2.54±0.03±0.11) keV.Received 9 August 2005DOI:https://doi.org/10.1103/PhysRevLett.96.082004©2006 American Physical Society

We report new measurements of semileptonic branching fractions of $B$ mesons produced at the $\ensuremath{\Upsilon}(4S)$ resonance determined by fitting the inclusive electron and muon momentum spectra to different theoretical models. Using $B(\overline{B}\ensuremath{\rightarrow}X{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}})$ to denote the average of the semileptonic branching fractions for $B$ decay to electrons and muons, we obtain $B(\overline{B}\ensuremath{\rightarrow}X{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}})=(10.5\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\pm\else\textpm\fi{}0.4)%$ using the refined free-quark model of Altarelli et al., and $B(\overline{B}\ensuremath{\rightarrow}X{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}})=(11.2\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.4)%$ using a modified version of the form-factor model of Isgur et al., in which the ${D}^{**}{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}}$ contribution is allowed to float in the fit. The average of these two results is $B(\overline{B}\ensuremath{\rightarrow}X{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}})=(10.8\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}0.4)%$, where the errors are statistical, systematic uncertainties in the measurement, and systematic uncertainties associated with the theoretical models, respectively. Semileptonic branching fractions as low as this are difficult to accommodate in theoretical models where hadronic $B$-meson decays arise only from spectator diagrams. We use dilepton yields to limit the uncertainty in the semileptonic branching fraction due to the possible existence of non-$B\overline{B}$ decays of the $\ensuremath{\Upsilon}(4S)$. In addition, we tag neutral $B$ mesons using the decays ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}}$ to obtain the first direct measurement of semileptonic branching fractions for neutral $B$ mesons; the average of the electron and muon results for neutral $B$ mesons is $B({\overline{B}}^{0}\ensuremath{\rightarrow}X{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}})=(9.9\ifmmode\pm\else\textpm\fi{}3.0\ifmmode\pm\else\textpm\fi{}0.9)%$.

We report new measurements of the branching fractions B(B−→D0l−¯ν), B(¯B0→D+l−¯ν), and B(B−→D*0l−¯ν). Combining these results with our previous measurement of B(¯B0→D*+l−¯ν), we find that the ratio of semileptonic widths for final states with a vector meson and pseudoscalar meson is (2.6+1.1+1.0−0.6−0.8) and the ratio of charged- to neutral-B-meson lifetimes is (0.89±0.19±0.13)(f00f+−) where (f00f+−) is the ratio of neutral- to charged-B-meson production at the Υ(4S). From the ¯B→Dl−¯ν branching fraction, we calculate |Vcb|=0.040±0.006±0.006, where the first error is statistical and the second is systematic and dominated by the uncertainty in the B-meson lifetime.Received 1 August 1990DOI:https://doi.org/10.1103/PhysRevD.43.651©1991 American Physical Society

The resonant substructure in D0 --> K0S pi+ pi- decays is described by a combination of ten quasi two-body intermediate states which include both CP-even and CP-odd eigenstates and one doubly-Cabibbo suppressed channel. We present a formalism that connects the variation in D0 decay time over the Dalitz plot with the mixing parameters, x and y, that describe off-shell and on-shell D0-D0B mixing. We analyze the CLEO II.V data sample and find the parameters x and y are consistent with zero. We limit (-4.7 < x < 8.6)% and (-6.1 < y < 3.5)% at the 95\% confidence level

A precision measurement of the mass of the h_c(1P1) state of charmonium has been made using a sample of 24.5 million psi(2S) events produced in e+e- annihilation at CESR. The reaction used was psi(2S) -> pi0 h_c, pi0 -> gamma gamma, h_c -> gamma eta_c, and the reaction products were detected in the CLEO-c detector. Data have been analyzed both for the inclusive reaction and for the exclusive reactions in which eta_c decays are reconstructed in fifteen hadronic decay channels. Consistent results are obtained in the two analyses. The averaged results of the present measurements are M(h_c)=3525.28+-0.19 (stat)+-0.12(syst) MeV, and B(psi(2S) -> pi0 h_c)xB(h_c -> gamma eta_c)= (4.19+-0.32+-0.45)x10^-4. Using the 3PJ centroid mass, Delta M_hf(1P)=<M(chi_cJ)> - M(h_c) = +0.02+-0.19+-0.13 MeV.

Analyzing 600/pb of e+e- collisions at 4170 MeV center-of-mass energy with the CLEO-c detector, we measure the branching fraction B(Ds+ -> tau+ nu)=(5.52\pm 0.57\pm 0.21)% using the tau+ -> rho^+ anti-nu decay mode. Combining with other CLEO measurements of B(Ds+ -> tau+ nu) we determine the pseudoscalar decay constant fDs = (259.7\pm 7.8\pm 3.4) MeV consistent with the value obtained from our Ds+ -> mu+ nu measurement of (257.6\pm 10.3\pm 4.3) MeV. Combining these measurements we find a value of fDs=(259.0 \pm 6.2\pm 3.0) MeV, that differs from the most accurate prediction based on unquenched lattice gauge theory of (241\pm 3) MeV by 2.4 standard deviations. We also present the first measurements of B(Ds+ -> K0 pi+ pi0)=(1.00\pm0.18\pm 0.04)%, and B(Ds+ -> pi+ pi0 pi0)=(0.65\pm0.13\pm 0.03)%, and measure a new value for B(Ds+ -> eta rho+)=(8.9\pm0.6\pm0.5)%.

Using 586 pb(-1) of e+ e- collision data at E(c.m.) = 4170 MeV, produced at the Cornell Electron Storage Ring collider and collected with the CLEO-c detector, we observe the process e+ e- → π+ π- h(c)(1P). We measure its cross section to be 15.6±2.3±1.9±3.0 pb, where the third error is due to the external uncertainty on the branching fraction of ψ(2S) → π0 h(c)(1P), which we use for normalization. We also find evidence for e+ e- → ηh(c)(1P) at 4170 MeV at the 3σ level and see hints of a rise in the e+ e- → π+ π- h(c)(1P) cross section at 4260 MeV.

The branching fractions of ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}$ meson decays serve to normalize many measurements of processes involving charm quarks. Using $586\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for 13 ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}$ decays in 16 reconstructed final states with a double tag technique. In particular we make a precise measurement of the branching fraction $\mathcal{B}({D}_{s}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{+})=(5.55\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.13)%$, where the uncertainties are statistical and systematic, respectively. We find a significantly reduced value of $\mathcal{B}({D}_{s}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}^{\ensuremath{'}})$ compared to the world average, and our results bring the inclusively and exclusively measured values of $\mathcal{B}({D}_{s}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}X)$ into agreement. We also search for $CP$-violating asymmetries in ${D}_{s}$ decays and measure the cross section of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{*}{D}_{s}$ at ${E}_{\mathrm{cm}}=4.17\text{ }\text{ }\mathrm{GeV}$.

We have used the CLEO-II detector at the Cornell Electron Storage Ringe (CESR) to study the inclusive production of charmonium mesons in a sample of 2.15 million BB¯ events. We find inclusive branching fractions of (1.12±0.04±0.06)% for B→J/ψX, (0.34±0.04±0.03)% for B→ψ′X, and (0.40±0.06±0.04)% for B→χc1X. We also find some evidence for the inclusive production of χc2, and set an upper limit for the branching fraction of the inclusive decay B→ηcX of 0.9% at 90% confidence level. Momentum spectra for inclusive J/ψ, ψ′, and χc1 production are presented. These measurements are compared to theoretical calculations.Received 13 December 1994DOI:https://doi.org/10.1103/PhysRevD.52.2661©1995 American Physical Society

We have studied two-body charmless hadronic decays of B mesons into the final states $\pi\pi$, $K \pi$, and $KK$. Using 3.3 million $B\bar{B}$ pairs collected with the CLEO-II detector, we have made the first observation of the decays $B^0\to K^+\pi^-$, $B^+\to K^0\pi^+$, and the sum of $B^+ \to \pi^+\pi^0$ and $B^+ \to K^+\pi^0$ decays (an average over charge-conjugate states is always implied). We place upper limits on branching fractions for the remaining decay modes.

We have studied hadronic decays of B mesons. We report measurements of exclusive branching ratios of several charm decay modes of B mesons to final states with a D or D∗ and one to three charged pions or a charged ρ and to final states with a ψ or ψ′, a kaon, and up to two charged pions. We have also measured inclusive branching ratios for B decays to D and D∗ and the spectra of these particles in B decays. The total charm content in B decay is found to be (101±12)%. The branching ratios and spectra are compared to form-factor models. We extract the parameters a1 and a2 of the model of Bauer, Stech, and Wirbel and the DS decay constant. The masses of the ¯B0 and B− mesons are measured. The mass difference between ¯B0 and B− is found to be -0.4±0.6±0.5 MeV/c2.Received 29 July 1991DOI:https://doi.org/10.1103/PhysRevD.45.21©1992 American Physical Society

Using the CLEO detector at the Cornell Electron-positron Storage Ring, we have measured the scaled momentum spectra, $d\ensuremath{\sigma}/d{x}_{p}$, and the inclusive production cross sections of the charm mesons ${D}^{+}$, ${D}^{0}$, ${D}^{\ensuremath{\star}+}$, and ${D}^{\ensuremath{\star}0}$ in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at about 10.5 GeV center of mass energy, excluding the decay products of $B$ mesons. The statistical accuracy and momentum resolution are superior to previous measurements at this energy.

We describe a search for psi(3770) decay to two-body non-DDbar final states in e+e- data produced by the CESR collider and analyzed with the CLEO-c detector. Vector-pseudoscalar production of Rho0Pi0, Rho+Pi-, OmegaPi0, PhiPi0, RhoEta, OmegaEta, PhiEta, RhoEtaPrime, OmegaEtaPrime, PhiEtaPrime, Kstar0 K0bar, and Kstar+K- is studied along with that of BOnePi (BOne0Pi0 and BOne+Pi-) and Pi+Pi-Pi0. A statistically significant signal is found for PhiEta, at an excess cross section of (2.4 +- 0.6) pb [Gamma_{PhiEta} (psi(3770)) =(74 +- 16)Mev], and a suggestive suppression of Pi+Pi-Pi0 and RhoPi. We conclude with form factor determinations for OmegaPi0, RhoEta, and RhoEtaPrime.

The spin-singlet $P$-wave state of charmonium, ${h}_{c}{(}^{1}{P}_{1})$, has been observed in the decay $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{h}_{c}$ followed by ${h}_{c}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}$. Inclusive and exclusive analyses of the $M({h}_{c})$ spectrum have been performed. Two complementary inclusive analyses select either a range of energies for the photon emitted in ${h}_{c}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}$ or a range of values of $M({\ensuremath{\eta}}_{c})$. These analyses, consistent with one another within statistics, yield $M({h}_{c})=[3524.9\ifmmode\pm\else\textpm\fi{}0.7\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4\text{ }\text{ }(\mathrm{sys})]\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and a product of the branching ratios ${\mathcal{B}}_{\ensuremath{\psi}}(\ensuremath{\psi}(2S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{h}_{c})\ifmmode\times\else\texttimes\fi{}{\mathcal{B}}_{h}({h}_{c}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c})=[3.5\ifmmode\pm\else\textpm\fi{}1.0\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.7\text{ }\text{ }(\mathrm{sys})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. When the ${\ensuremath{\eta}}_{c}$ is reconstructed in seven exclusive decay modes, $17.5\ifmmode\pm\else\textpm\fi{}4.5$ ${h}_{c}$ events are seen with an average mass $M({h}_{c})=[3523.6\ifmmode\pm\else\textpm\fi{}0.9\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.5\text{ }\text{ }(\mathrm{sys})]\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, and ${\mathcal{B}}_{\ensuremath{\psi}}{\mathcal{B}}_{h}=[5.3\ifmmode\pm\else\textpm\fi{}1.5\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.0\text{ }\text{ }(\mathrm{sys})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. If combined, the inclusive and exclusive data samples yield an overall mass $M({h}_{c})=[3524.4\ifmmode\pm\else\textpm\fi{}0.6\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4\text{ }\text{ }(\mathrm{sys})]\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and product of branching ratios ${\mathcal{B}}_{\ensuremath{\psi}}{\mathcal{B}}_{h}=[4.0\ifmmode\pm\else\textpm\fi{}0.8\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.7\text{ }\text{ }(\mathrm{sys})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The ${h}_{c}$ mass implies a $P$-wave hyperfine splitting $\ensuremath{\Delta}{M}_{\mathrm{HF}}(1P)\ensuremath{\equiv}⟨M({1}^{3}P)⟩\ensuremath{-}M({1}^{1}{P}_{1})=[1.0\ifmmode\pm\else\textpm\fi{}0.6\text{ }\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4\text{ }\text{ }(\mathrm{sys})]\text{ }\text{ }\mathrm{MeV}/{c}^{2}$.

Using a sample of integrated luminosity 1.68 fb−1 collected with the CLEO-II detector at the Cornell Electron Storage Ring, we measure the branching ratios for the dominant exclusive semileptonic decays D → Klν and D → K∗lν, using charged and neutral D mesons. We also make a precise measurement of the vector form factor for the decay D0 → K−l+ν, using a sample of 2700 events.

We measure the cross section for e+e- -->psi(3770) -->hadrons at Ec.m.=3773 MeV to be (6.38+/-0.08(+0.41)(-0.30) nb using the CLEO detector at the CESR e+e- collider. The difference between this and the e+e- -->psi(3770) -->DD cross section at the same energy is found to be (-0.01+/-0.08(+0.41)(-0.30) nb. With the observed total cross section, we extract Gamma(ee)(psi(3770))=(0.204+/-0.003(+0.041)(-0.027) keV. Uncertainties shown are statistical and systematic, respectively.

Using the CLEO detector at the Cornell Electron Storage Ring, we have found evidence for L=1 charmed mesons in e+e− annihilations. We observe a D**0 state at mass 2461±3±1 MeV/c2 and width 20−12−10+9+9 MeV/c2 decaying to D+π−. We also see an enhancement in the m(D*+π−)−m(D*+) mass-difference spectrum and by examining D*+ decay-angle dependence, we see structure consistent with two states decaying to D*+π−. We observe a lower-mass state, at mass (2428±3±2) MeV/c2 and width (23−6−4+8+10) MeV/c2, assuming that the higher-mass component is from the decay D**0(2461)→D*+π−. We present arguments for the spin-parity assignments of these states. We also report observation of candidate L=1 cs¯ state decaying to D*+Ks0.Received 24 August 1989DOI:https://doi.org/10.1103/PhysRevD.41.774©1990 American Physical Society

The distributions of quarks in the pion and nucleon are extracted from measurements of the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}N\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}X$ at 253 GeV/c in a naive Drell-Yan analysis, as well as QCD-corrected analyses at leading-log and next-to-leading-log order. As ${x}_{\ensuremath{\pi}}\ensuremath{\rightarrow}1$ the pion structure function shows a term that varies as $\frac{1}{{m}_{\ensuremath{\mu}\ensuremath{\mu}}^{4}}$, which we interpret as a higher-twist effect. Additionally, the angular distribution of the ${\ensuremath{\mu}}^{+}$ in the muon-pair rest frame tends towards ${sin}^{2}\ensuremath{\theta}$ as ${x}_{\ensuremath{\pi}}\ensuremath{\rightarrow}1$ and as ${m}_{\ensuremath{\mu}\ensuremath{\mu}}\ensuremath{\rightarrow}0$ in a manner consistent with higher-twist effects. When the strongly mass-dependent higher-twist effects are included as part of the pion structure function, the nucleon structure function agrees well with leading-twist results from deeply inelastic lepton-hadron scattering. A significant advance of the present work is the extension of the analysis to low masses by the subtraction of the $\frac{J}{\ensuremath{\psi}}$ and ${\ensuremath{\psi}}^{\ensuremath{'}}$ resonances from the continuum. Our analysis covers the kinematic range $0.4&lt;{x}_{\ensuremath{\pi}}&lt;1.0$ and $0.02&lt;{x}_{N}&lt;0.33$ with $3.0&lt;{m}_{\ensuremath{\mu}\ensuremath{\mu}}&lt;8.55$ GeV/${\mathit{c}}^{2}$. Cross sections for ${\ensuremath{\psi}}^{\ensuremath{'}}$ production are presented in an appendix.

A precision measurement of the D0 meson mass has been made using ∼281 pb−1 of e+e− annihilation data taken with the CLEO-c detector at the ψ(3770) resonance. The exclusive decay D0→KSϕ has been used to obtain M(D0)=1864.847±0.150(stat)±0.095(syst) MeV. This corresponds to M(D0¯¯¯D*0)=3871.81±0.36 MeV, and leads to a well-constrained determination of the binding energy of the proposed D0¯¯¯D*0 molecule X(3872), as Eb=0.6±0.6 MeV.Received 8 January 2007DOI:https://doi.org/10.1103/PhysRevLett.98.092002©2007 American Physical Society

We perform a Dalitz plot analysis of D^+ -> K^-pi^+pi^+ decay with the CLEO-c data set of 572 pb^-1 of e^+e^- collisions accumulated at the psi(3770). This corresponds to 1.6 million D^+D^- pairs from which we select 140793 candidate events with a small background of 1.1%. We compare our results with previous measurements using the isobar model. We modify the isobar model with improved description of some of the contributing resonances, and get better agreement with our data. We also consider a quasi-model-independent approach and measure the magnitude and phase of the contributing K pi S wave in the range of invariant masses from the threshold to the maximum in this decay. This gives an improved descriptions of our data over the isobar model. Finally we allow for an isospin-two pi^+pi^+ S-wave contribution, and find that adding this to both the isobar model and quasi-model-independent approach gives the best description of our data.

Using a sample of 484 000 B mesons collected with the CLEO detector at the Cornell Electron Storage Ring, we have measured B(B\ifmmode\bar\else\textasciimacron\fi{} $^{0}\mathrm{D}^{\mathrm{*}+}$${\mathrm{l}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\nu}) and found that the polarization of the ${D}^{\mathrm{*}+}$ is small. These results are compared with models of semileptonic B decay.

The branching fractions of D±s meson decays serve to normalize many measurements of processes involving charm quarks. Using 298 pb−1 of e+e− collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for eight D±s decays with a double tag technique. In particular we determine the branching fraction B(D+s→K−K+π+)=(5.50±0.23±0.16)%, where the uncertainties are statistical and systematic, respectively. We also provide partial branching fractions for kinematic subsets of the K−K+π+ decay mode.Received 18 December 2007DOI:https://doi.org/10.1103/PhysRevLett.100.161804©2008 American Physical Society

We have studied the leptonic decay ${D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}$, via the decay channel ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\nu}}_{e}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}}$, using a sample of tagged ${D}_{s}^{+}$ decays collected near the ${D}_{s}^{*\ifmmode\pm\else\textpm\fi{}}{D}_{s}^{\ensuremath{\mp}}$ peak production energy in ${e}^{+}{e}^{\ensuremath{-}}$ collisions with the CLEO-c detector. We obtain $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(5.30\ifmmode\pm\else\textpm\fi{}0.47\ifmmode\pm\else\textpm\fi{}0.22)%$ and determine the decay constant ${f}_{{D}_{s}}=(252.5\ifmmode\pm\else\textpm\fi{}11.1\ifmmode\pm\else\textpm\fi{}5.2)\text{ }\text{ }\mathrm{MeV}$, where the first uncertainties are statistical and the second are systematic.

We measure the decay constant f(Ds+) using the D(s+)-->l+ nu channel, where the l+ designates either a mu+ or a tau+, when the tau+ -->pi+ nu. Using both measurements we find f(Ds+)=274+/-13+/-7 MeV. Combining with our previous determination of f(D+), we compute the ratio f(Ds+)/f(D+)=1.23+/-0.11+/-0.04. We compare with theoretical estimates.

We report determination of branching fractions for the decays psi(2S) --> h + J/psi, where h=any, pi+pi-, pi0pi0, eta, pi0, and gamma gamma through chi_{c0,1,2}. These measurements use 27M psi(2S) decays produced in e+e- collision data collected with the CLEO detector. The resulting branching fractions and ratios thereof improve upon previously achieved precision in all cases, and in combination with other measurements permit determination of B(chi_cJ --> gamma J/psi) and B(psi(2S) --> light hadrons).

We present a measurement of the cross section and transverse single-spin asymmetry ($A_N$) for $\eta$ mesons at large pseudorapidity from $\sqrt{s}=200$~GeV $p^{\uparrow}+p$ collisions. The measured cross section for $0.5<p_T<5.0$~GeV/$c$ and $3.0<|\eta|<3.8$ is well described by a next-to-leading-order perturbative-quantum-chromodynamics calculation. The asymmetries $A_N$ have been measured as a function of Feynman-$x$ ($x_F$) from $0.2<|x_{F}|<0.7$, as well as transverse momentum ($p_T$) from $1.0<p_T<4.5$~GeV/$c$. The asymmetry averaged over positive $x_F$ is $\langle{A_{N}}\rangle=0.061{\pm}0.014$. The results are consistent with prior transverse single-spin measurements of forward $\eta$ and $\pi^{0}$ mesons at various energies in overlapping $x_F$ ranges. Comparison of different particle species can help to determine the origin of the large observed asymmetries in $p^{\uparrow}+p$ collisions.

Important global efforts are underway toward lowering the cost of electric machines for electric and hybrid vehicles by reducing or eliminating the use of rare earth materials which have been experiencing significant price increases and volatility. This study will present several designs that reduce or eliminate rare-earth materials. All these designs are targeting the same set of specifications of 55 kW peak at 2800 rpm and 30 kW continuous over a speed range going from 2800–14,000 rpm. This provides a fair basis of comparison of various machine topologies. The study will provide a quantitative comparison of the performance of various machine topologies as well as highlight the key tradeoffs.

Using a sample of 3.3×106 Υ(4S)→B¯B events collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR), we measure B(→Bρlν), |Vub|, and the partial rate (ΔΓ) in three bins of q2≡(pB−pρ)2. We find B(B0→ρ−l+ν)=(2.69±0.41+0.35−0.40±0.50)×10−4, |Vub|=(3.23±0.24+0.23−0.26±0.58)×10−3, ΔΓ(0<q2<7GeV2/c4)=(7.6±3.0+0.9−1.2±3.0)×10−2ns−1, ΔΓ(7<q2<14GeV2/c4)=(4.8±2.9+0.7−0.8±0.7)×10−2ns−1, and ΔΓ(14<q2<21GeV2/c4)=(7.1±2.1+0.9−1.1±0.6)×10−2ns−1. Here, l=e or μ, but not both, and the errors are statistical, systematic, and theoretical. The method is sensitive primarily to →Bρlν decays with leptons in the energy range above 2.3 GeV. Averaging with the previously published CLEO results for →Bρlν, we obtain B(B0→ρ−l+ν)=(2.57±0.29+0.33−0.46±0.41)×10−4 and |Vub|=(3.25±0.14+0.21−0.29±0.55)×10−3. Received 24 May 1999DOI:https://doi.org/10.1103/PhysRevD.61.052001©2000 American Physical Society

We describe several measurements using the decays D 0 → K + K -and π + π -.We find the ratio of partial widths, Γ D 0 → K + K -/Γ D 0 → π + π -, to be 2.96 ± 0.16 ± 0.15, where the first error is statistical and the second is systematic.We observe no evidence for direct CP violation, obtaining A CP (KK) = (0.0 ± 2.2 ± 0.8)% and A CP (ππ) = (1.9 ± 3.2 ± 0.8)%.In the limit of no CP violation we measure the mixing parameter y CP = -0.012± 0.025 ± 0.

Using data taken with the CLEO II detector at the Cornell Electron Storage Ring, we present the first full angular analysis in the color-suppressed modes B0→J/ψK*0 and B+→J/ψK*+. This leads to a complete determination of the decay amplitudes of these modes including the longitudinal polarization γL/γ=0.52±0.07±0.04 and the P wave component |P|2=0.16±0.08±0.04. In addition, we update the branching fractions for B→J/ψK and B→J/ψK∗.Received 24 February 1997DOI:https://doi.org/10.1103/PhysRevLett.79.4533©1997 American Physical Society

Using data recorded by the CLEO II detector at the Cornell Electron Storage Ring, we report the first observation of an excited charmed baryon decaying into ${\ensuremath{\Xi}}_{c}^{0}{\ensuremath{\pi}}^{+}$. The state has mass difference $M({\ensuremath{\Xi}}_{c}^{0}{\ensuremath{\pi}}^{+})\ensuremath{-}M({\ensuremath{\Xi}}_{c}^{0})$ of $174.3\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}1.0\mathrm{MeV}{/c}^{2}$, and a width of $&lt;3.1\mathrm{MeV}{/c}^{2}$ (90% confidence level limit). We identify the new state as the ${\ensuremath{\Xi}}_{c}^{*+}$, the isospin partner of the recently discovered ${\ensuremath{\Xi}}_{c}^{*0}$.

The decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ has been observed with the CLEO II detector. The $\ensuremath{\eta}$ meson is reconstructed using two decay channels, $\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ and ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$. The measured branching fraction is $B({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(2.6\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, somewhat higher than theoretical estimates. An improved upper limit for the second-class-current decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ is set, $B({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}})&lt;1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at 95% C.L., consistent with theoretical expectations.

We have measured the CP asymmetry A(CP) identical with[gamma(b-->sgamma)-gammab-->sgamma)]/[gamma(b-->sgamma)+gamma(b-->sgamma)] to be A(CP) = (-0.079+/-0.108+/-0.022) (1.0+/-0.030), implying that, at 90% confidence level, A(CP) lies between -0.27 and +0.10. These limits rule out some extreme non-standard-model predictions, but are consistent with most, as well as with the standard model.

We consider the decay of \ensuremath{\Upsilon}(1S) particles produced at CESR into a photon which is observed by the CLEO detector plus particles which are not seen. These could be real particles which fall outside of our acceptance, or particles which are noninteracting. We report the results of our search fo the process \ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}+``unseen'' for photon energies &gt;1 GeV, obtaining limits for the case where ``unseen'' is either a single particle or a particle-antiparticle pair. Our upper limits represent the highest sensitivity measurements for such decays to date.

We have studied the inclusive photon spectra in Upsilon(2S) and Υ(3S) decays using a large statistics data sample obtained with the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates and photon energies for Upsilon(2S)-&gt;gamma chi_bJ(1P) and Upsilon(3S)-&gt;gamma chi_bJ(2P) J=0,1,2. We measure the rate for a rare E1 transition Upsilon(3S)-&gt;gamma chi_b0(1P) for the first time. We also set upper limits on the rates for the hindered magnetic dipole (M1) transitions to the eta_b(1S) and eta_b(2S) states.

Using the CLEO II detector, we have measured the branching fractions for $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\Upsilon}(1S)$, $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\Upsilon}(2S)$, and the cascade $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(2S)+X$, $\ensuremath{\Upsilon}(2S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\Upsilon}(1S)$, analyzing the exclusive mode where the daughter $\ensuremath{\Upsilon}$ state decays to a ${e}^{+}{e}^{\ensuremath{-}}$ or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ pair, as well as the inclusive ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ transitions where the final $\ensuremath{\Upsilon}$ state decays into hadrons. Properties of the $\ensuremath{\pi}\ensuremath{\pi}$ system are analyzed. Searches for the cascade decay $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{h}_{b}$, ${h}_{b}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{b}$ and $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{h}_{b}$ were also performed.

We report results from a search for the decays ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$, ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$, and ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$. We find 90% confidence level upper limits on the branching fractions, ${\mathit{B}}_{\mathrm{\ensuremath{\pi}}\mathrm{\ensuremath{\pi}}}$2.9\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}5}$, ${\mathit{B}}_{\mathit{K}\mathrm{\ensuremath{\pi}}}$2.6\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}5}$, and ${\mathit{B}}_{\mathit{K}\mathit{K}}$0.7\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}5}$. While there is no statistically significant signal in the individual modes, the sum of ${\mathit{B}}_{\mathrm{\ensuremath{\pi}}\mathrm{\ensuremath{\pi}}}$ and ${\mathit{B}}_{\mathit{K}\mathrm{\ensuremath{\pi}}}$ exceeds zero with a significance of more than 4 standard deviations, indicating that we have observed charmless hadronic B decays.

The decay ${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\ensuremath{\nu}}_{\mathrm{\ensuremath{\tau}}}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{0}$\ensuremath{\eta} has been observed for the first time using the CLEO-II detector at the Cornell Electron Storage Ring. The measured branching ratio (0.17\ifmmode\pm\else\textpm\fi{}0.02\ifmmode\pm\else\textpm\fi{}0.02)%, agrees with the CVC (conserved vector current) prediction based on ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\eta} data. Upper limits on the branching ratios for other \ensuremath{\tau} decays to final states including \ensuremath{\eta} mesons are improved by an order of magnitude compared to previous measurements.

We have studied the inclusive photon spectrum in psi(2S) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates for psi(2S)--> gamma chicJ(1P) (J=0,1,2). We also confirm the hindered magnetic dipole (M1) transition, psi(2S)-->gamma etac(1S). However, the direct M1 transition psi(2S)-->gamma etac(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 MeV is not found in our data.

We present measurements of D--> KS0 pi and D--> KL0 pi branching fractions using 281 pb(-1) of psi(3770) data at the CLEO-c experiment. We find that B(D0--> KS0 pi 0) is larger than B(D0--> KL0 pi 0), with an asymmetry of R(D0)=0.108+/-0.025+/-0.024. For B(D+--> KS0 pi+) and B(D+--> KL0 pi+), we observe no measurable difference; the asymmetry is R(D+)=0.022+/-0.016+/-0.018. The D0 asymmetry is consistent with the value based on the U-spin prediction A(D0--> K0 pi 0)/A(D0--> K0 pi 0)=-tan2 theta C, where theta C is the Cabibbo angle.

Using $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}D\overline{D}$ events collected with the CLEO-c detector at the Cornell ${e}^{+}{e}^{\ensuremath{-}}$ storage ring, tagged by fully reconstructing one $D$ meson in a hadronic decay mode, we measure absolute branching fractions and differential decay rates for ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e}$, ${D}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}{\ensuremath{\nu}}_{e}$, ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e}$, and ${D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{0}{e}^{+}{\ensuremath{\nu}}_{e}$. The measured decay rates are used to study semileptonic form factors governing these transitions and to test unquenched Lattice QCD (LQCD) calculations. We average our results with previously published CLEO-c measurements of the same quantities using a neutrino reconstruction technique. Combining LQCD calculations of form factor absolute normalizations ${f}_{+}(0)$ and measurements of ${f}_{+}^{\ensuremath{\pi}}(0)|{V}_{cd}|$ and ${f}_{+}^{K}(0)|{V}_{cs}|$, we find $|{V}_{cd}|=0.222(8)(3)(23)$ and $|{V}_{cs}|=1.018(10)(8)(106)$, where the uncertainties are statistical, experimental systematic, and from LQCD, respectively.

Using ψ(2S)→π+π−J/ψ, J/ψ→γη′ events acquired with the CLEO-c detector at the CESR e+e− collider, we make the first observations of the decays η′→π+π−π0 and η′→π+π−e+e−, measuring absolute branching fractions (37+11−9±4)×10−4 and (25+12−9±5)×10−4, respectively. For η′→π+π−π0, this result probes the mechanism of isospin violation and the roles of π0/η/η′-mixing and final state rescattering in strong decays. We also set upper limits on branching fractions for η′ decays to π+π−μ+μ−, 2(π+π−), π+π−2π0, 2(π+π−)π0, 3(π+π−), and invisible final states.Received 15 September 2008DOI:https://doi.org/10.1103/PhysRevLett.102.061801©2009 American Physical Society

We report the first measurement of transverse single-spin asymmetries in $J/\psi$ production from transversely polarized $p+p$ collisions at $\sqrt{s} = 200$ GeV with data taken by the PHENIX experiment in 2006 and 2008. The measurement was performed over the rapidity ranges $1.2 < |y| < 2.2$ and $ |y| < 0.35$ for transverse momenta up to 6 GeV/$c$. $J/\psi$ production at RHIC is dominated by processes involving initial-state gluons, and transverse single-spin asymmetries of the $J/\psi$ can provide access to gluon dynamics within the nucleon. Such asymmetries may also shed light on the long-standing question in QCD of the $J/\psi$ production mechanism. Asymmetries were obtained as a function of $J/\psi$ transverse momentum and Feynman-$x$, with a value of $-0.086 \pm 0.026^{\rm stat} \pm 0.003^{\rm syst}$ in the forward region. This result suggests possible nonzero trigluon correlation functions in transversely polarized protons and, if well defined in this reaction, a nonzero gluon Sivers distribution function.

Electric drive systems, which include electric machines and power electronics, are a key enabling technology for advanced vehicle propulsion systems that reduce the petroleum dependence of the ground transportation sector. To have significant effect, electric drive technologies must be economical in terms of cost, weight, and size while meeting performance and reliability expectations. This paper will provide details of the design, analysis and testing of an advanced interior permanent magnet (IPM) machine that was developed to meet the FreedomCar 2020 specifications. The 12 slot/10 pole machine has segmented stator structure equipped with fractional-slot concentrated-windings (FSCW). The rotor has a novel spoke structure. Several prototypes with different thermal management schemes have been built and tested. The paper will cover the test results for all these prototypes and highlight the tradeoffs between the various schemes.

The cross section and transverse single-spin asymmetries of $\mu^{-}$ and $\mu^{+}$ from open heavy-flavor decays in polarized $p$+$p$ collisions at $\sqrt{s}=200$ GeV were measured by the PHENIX experiment during 2012 at the Relativistic Heavy Ion Collider. Because heavy-flavor production is dominated by gluon-gluon interactions at $\sqrt{s}=200$ GeV, these measurements offer a unique opportunity to obtain information on the trigluon correlation functions. The measurements are performed at forward and backward rapidity ($1.4<|y|<2.0$) over the transverse momentum range of $1.25<p_T<7$ GeV/$c$ for the cross section and $1.25<p_T<5$ GeV/$c$ for the asymmetry measurements. The obtained cross section is compared to a fixed-order-plus-next-to-leading-log perturbative-quantum-chromodynamics calculation. The asymmetry results are consistent with zero within uncertainties, and a model calculation based on twist-3 three-gluon correlations agrees with the data.

Using a sample of 3.3 million B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied $B^- \to D^0 \ell\nu$ and $\bar{B}^0 \to D^+ \ell\nu$ decays, where $\ell$ can be either an electron or muon. We distinguish $B \to D \ell\nu$ from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against the D-lepton pairs. We find the decay rate $\Gamma(B \to D\ell\nu)$ = (14.1 +- 1.0 +- 1.2) ns-1 and derive branching fractions for $B^- \to D^0 \ell\nu$ and $\bar{B^0} \to D^+ \ell\nu$ of (2.32 +- 0.17 +- 0.20)% and 2.20 +- 0.16 +- 0.19)% respectively, where the uncertainties are statistical and systematic. We also investigate the $B \to D \ell\nu$ form factor and the implication of the result for $|V_{cb}|$.

Using the CLEO detector at the Cornell Electron Storage Ring, we observe B-meson decays to Λc+ and report on improved measurements of inclusive branching fractions and momentum spectra of other baryons. For the inclusive decay B¯→Λc+X with Λc+→pK−π+, we find that the product branching fraction B(B¯→Λc+X)B(Λc+→pK−π+)=(0.273±0.051±0.039)%. Our measured inclusive branching fractions to noncharmed baryons are B(B→pX)=(8.0±0.5±0.3)%, B(B→ΛX)=(3.8±0.4±0.6)%, and B(B→Ξ−X)=(0.27±0.05±0.04)%. From these rates and studies of baryon-lepton and baryon-antibaryon correlations in B decays, we have estimated the branching fraction B(B¯→Λc+X) to be (6.4±0.8±0.8)%. Combining these results, we calculate B(Λc+→pK−π+) to be (4.3±1.0±0.8)%.Received 15 April 1991DOI:https://doi.org/10.1103/PhysRevD.45.752©1992 American Physical Society

We have studied the color-suppressed hadronic decays of neutral B mesons into the final states ${D}^{(*)0}{\ensuremath{\pi}}^{0}$. Using $9.67\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected with the CLEO detector, we observe the decays ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\pi}}^{0}$ with the branching fractions $B({\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({2.74}_{\ensuremath{-}0.32}^{+0.36}\ifmmode\pm\else\textpm\fi{}0.55)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $B({\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({2.20}_{\ensuremath{-}0.52}^{+0.59}\ifmmode\pm\else\textpm\fi{}0.79)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The first error is statistical and the second systematic. The statistical significance of the ${D}^{0}{\ensuremath{\pi}}^{0}$ signal is $12.1\ensuremath{\sigma}$ ( $5.9\ensuremath{\sigma}$ for ${D}^{*0}{\ensuremath{\pi}}^{0}$). Utilizing the ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{(*)0}{\ensuremath{\pi}}^{0}$ branching fractions we determine the strong phases ${\ensuremath{\delta}}_{I,D(*)}$ between isospin $1/2$ and $3/2$ amplitudes in the $D\ensuremath{\pi}$ and ${D}^{*}\ensuremath{\pi}$ final states to be $\mathrm{cos}{\ensuremath{\delta}}_{I,D}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.89\ifmmode\pm\else\textpm\fi{}0.08$ and $\mathrm{cos}{\ensuremath{\delta}}_{I,D*}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.89\ifmmode\pm\else\textpm\fi{}0.08$, respectively.

From electron-positron collision data collected with the CLEO detector operating at Cornell Electron Storage Ring near sqrt[s]=10.6 GeV, improved measurements of the branching fractions for tau decays into three explicitly identified hadrons and a neutrino are presented as B(tau(-)-->pi(-)pi(+)pi(-)nu(tau))=(9.13+/-0.05+/-0.46)%, B(tau(-)-->K-pi(+)pi(-)nu(tau))=(3.84+/-0.14+/-0.38) x 10(-3), B(tau(-)-->K-K+pi(-)nu(tau))=(1.55+/-0.06+/-0.09) x 10(-3), and B(tau(-)-->K-K+K-nu(tau))<3.7 x 10(-5) at 90% C.L., where the uncertainties are statistical and systematic, respectively.