E. von Toerne

Using 13.5 ${\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to ${D}_{s}^{*+}{\ensuremath{\pi}}^{0}$ with a mass near $2.46\mathrm{GeV}{/c}^{2}.$ The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at $2.32\mathrm{GeV}{/c}^{2},$ the ${D}_{\mathrm{sJ}}^{*}{(2317)}^{+},$ that decays to ${D}_{s}^{+}{\ensuremath{\pi}}^{0}.$ Reconstructing the ${D}_{s}^{+}{\ensuremath{\pi}}^{0}$ and ${D}_{s}^{*+}{\ensuremath{\pi}}^{0}$ final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, $\ensuremath{\Delta}{M(D}_{s}{\ensuremath{\pi}}^{0}{)=M(D}_{s}{\ensuremath{\pi}}^{0})\ensuremath{-}{M(D}_{s})$ and $\ensuremath{\Delta}{M(D}_{s}^{*}{\ensuremath{\pi}}^{0}{)=M(D}_{s}^{*}{\ensuremath{\pi}}^{0})\ensuremath{-}{M(D}_{s}^{*}),$ both of them at values near $350\mathrm{MeV}{/c}^{2}.$ We interpret these peaks as signatures of two distinct states, the ${D}_{\mathrm{sJ}}^{*}{(2317)}^{+}$ plus a new state, designated as the ${D}_{\mathrm{sJ}}{(2463)}^{+}.$ Because of the similar $\ensuremath{\Delta}M$ values, each of these states represents a source of background for the other if photons are lost, ignored or added. A quantitative accounting of these reflections confirms that both states exist. We have measured the mean mass differences $〈\ensuremath{\Delta}{M(D}_{s}{\ensuremath{\pi}}^{0})〉=350.0\ifmmode\pm\else\textpm\fi{}1.2(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.0(\mathrm{syst})\mathrm{MeV}{/c}^{2}$ for the ${D}_{\mathrm{sJ}}^{*}{(2317)}^{+}$ state, and $〈\ensuremath{\Delta}{M(D}_{s}^{*}{\ensuremath{\pi}}^{0})〉=351.2\ifmmode\pm\else\textpm\fi{}1.7(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.0(\mathrm{syst})\mathrm{MeV}{/c}^{2}$ for the new ${D}_{\mathrm{sJ}}{(2463)}^{+}$ state. We have also searched, but find no evidence, for decays of the two states via the channels ${D}_{s}^{*+}\ensuremath{\gamma},{D}_{s}^{+}\ensuremath{\gamma},$ and ${D}_{s}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}.$ The observations of the two states at 2.32 and $2.46\mathrm{GeV}{/c}^{2},$ in the ${D}_{s}^{+}{\ensuremath{\pi}}^{0}$ and ${D}_{s}^{*+}{\ensuremath{\pi}}^{0}$ decay channels, respectively, are consistent with their interpretations as $c\overline{s}$ mesons with an orbital angular momentum $L=1$ and spin and parity ${J}^{P}{=0}^{+}$ and ${1}^{+}.$

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 report on a study of the invariant mass spectrum of the hadronic system in the decay τ−→π−π0ντ. This study was performed with data obtained with the CLEO II detector operating at the CESR e+e− collider. We present fits to phenomenological models in which resonance parameters associated with the ρ(770) and ρ(1450) mesons are determined. The π−π0 spectral function inferred from the invariant mass spectrum is compared with data on e+e−→π+π− as a test of the conserved vector current theorem. We also discuss the implications of our data with regard to estimates of the hadronic contribution to the muon anomalous magnetic moment.Received 21 October 1999DOI:https://doi.org/10.1103/PhysRevD.61.112002©2000 American Physical Society

Using 13.5 inverse fb of e+e- annihilation data collected with the CLEO II detector we have observed a narrow resonance in the Ds*+pi0 final state, with a mass near 2.46 GeV. The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32 GeV, the DsJ*(2317)+ that decays to Ds+pi0. Reconstructing the Ds+pi0 and Ds*+pi0 final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, dM(Dspi0)=M(Dspi0)-M(Ds) and dM(Ds*pi0)=M(Ds*pi0)-M(Ds*), both of them at values near 350 MeV. We interpret these peaks as signatures of two distinct states, the DsJ*(2317)+ plus a new state, designated as the DsJ(2463)+. Because of the similar dM values, each of these states represents a source of background for the other if photons are lost, ignored or added. A quantitative accounting of these reflections confirms that both states exist. We have measured the mean mass differences <dM(Dspi0)> = 350.0 +/- 1.2 [stat] +/- 1.0 [syst] MeV for the DsJ*(2317) state, and <dM(Ds*pi0)> = 351.2 +/- 1.7 [stat] +/- 1.0 [syst] MeV for the new DsJ(2463)+ state. We have also searched, but find no evidence, for decays of the two states via the channels Ds*+gamma, Ds+gamma, and Ds+pi+pi-. The observations of the two states at 2.32 and 2.46 GeV, in the Ds+pi0 and Ds*+pi0 decay channels respectively, are consistent with their interpretations as (c anti-strange) mesons with orbital angular momentum L=1, and spin-parities of 0+ and 1+.

In high-energy physics, with the search for ever smaller signals in ever larger data sets, it has become essential to extract a maximum of the available information from the data. Multivariate classification methods based on machine learning techniques have become a fundamental ingredient to most analyses. Also the multivariate classifiers themselves have significantly evolved in recent years. Statisticians have found new ways to tune and to combine classifiers to further gain in performance. Integrated into the analysis framework ROOT, TMVA is a toolkit which hosts a large variety of multivariate classification algorithms. Training, testing, performance evaluation and application of all available classifiers is carried out simultaneously via user-friendly interfaces. With version 4, TMVA has been extended to multivariate regression of a real-valued target vector. Regression is invoked through the same user interfaces as classification. TMVA 4 also features more flexible data handling allowing one to arbitrarily form combined MVA methods. A generalised boosting method is the first realisation benefiting from the new framework.

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 Cornell Electron-positron Storage Ring beam spot to measure the energy release distribution from the D*(+)-->D(0)pi(+) decay. We find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. We also measure the energy release in the decay and compute Delta m identical with m(D*(+))-m(D(0)) = 145.412+/-0.002 (stat)+/-0.012 (syst) MeV/c(2).

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

We report on determinations of $|{V}_{\mathrm{ub}}|$ resulting from studies of the branching fraction and ${q}^{2}$ distributions in exclusive semileptonic B decays that proceed via the $\stackrel{\ensuremath{\rightarrow}}{b}u$ transition. Our data set consists of the $9.7\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ meson pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the CLEO II detector. We measure $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\mathcal{l}}^{+}\ensuremath{\nu})=(1.33\ifmmode\pm\else\textpm\fi{}0.18\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.07)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ensuremath{-}}{\mathcal{l}}^{+}\ensuremath{\nu})=(2.17\ifmmode\pm\else\textpm\fi{}{0.34}_{\ensuremath{-}0.54}^{+0.47}\ifmmode\pm\else\textpm\fi{}0.41\ifmmode\pm\else\textpm\fi{}0.01)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ where the errors are statistical, experimental systematic, systematic due to residual form-factor uncertainties in the signal, and systematic due to residual form-factor uncertainties in the cross-feed modes, respectively. We also find $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\mathcal{l}}^{+}\ensuremath{\nu})=(0.84\ifmmode\pm\else\textpm\fi{}0.31\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ consistent with what is expected from the $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\pi}\mathcal{l}\ensuremath{\nu}$ mode and quark model symmetries. We extract $|{V}_{\mathrm{ub}}|$ using light-cone sum rules for $0&lt;~{q}^{2}&lt;16{\mathrm{GeV}}^{2}$ and lattice QCD for $16{\mathrm{GeV}}^{2}&lt;~{q}^{2}&lt;{q}_{\mathrm{max}}^{2}.$ Combining both intervals yields $|{V}_{\mathrm{ub}}|=(3.24\ifmmode\pm\else\textpm\fi{}0.22\ifmmode\pm\else\textpm\fi{}{0.13}_{\ensuremath{-}0.39}^{+0.55}\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for $\ensuremath{\pi}\mathcal{l}\ensuremath{\nu},$ and $|{V}_{\mathrm{ub}}|=(3.00\ifmmode\pm\else\textpm\fi{}{0.21}_{\ensuremath{-}0.35\ensuremath{-}0.38}^{+0.29+0.49}\ifmmode\pm\else\textpm\fi{}0.28)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for $\ensuremath{\rho}\mathcal{l}\ensuremath{\nu},$ where the errors are statistical, experimental systematic, theoretical, and \ensuremath{\rho}l\ensuremath{\nu} form-factor shape, respectively. Our combined value from both decay modes is $|{V}_{\mathrm{ub}}|=(3.17\ifmmode\pm\else\textpm\fi{}{0.17}_{\ensuremath{-}0.17\ensuremath{-}0.39}^{+0.16+0.53}\ifmmode\pm\else\textpm\fi{}0.03)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}.$

The resonant structure of the four pion final state in the decay $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}3\ensuremath{\pi}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ has been analyzed using 4.27 million ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ pairs collected by the CLEO II experiment at the Cornell Electron Storage Ring. A partial wave analysis of the resonant structure of the $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}3\ensuremath{\pi}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ decay has been performed; the spectral decomposition of the four pion system is dominated by the $\ensuremath{\omega}\ensuremath{\pi}$ and ${a}_{1}\ensuremath{\pi}$ final states. The mass and width of the ${\ensuremath{\rho}}^{\ensuremath{'}}$ resonance have been extracted from a fit to the $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\omega}\ensuremath{\pi}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ spectral function. We have searched for second class currents in the decay $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\omega}\ensuremath{\pi}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ using spin-parity analysis and established an upper limit on the non-vector current contribution.

We present an update of the search for the lepton family number violating decay $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\mu}\ensuremath{\gamma}$ using 12.6 million ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ pairs collected with the CLEO detector. No evidence of a signal has been found and the corresponding upper limit is $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\mu}\ensuremath{\gamma})&lt;1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at 90% C.L., significantly smaller than previous experimental limits.

In a sample of 9.66x10(6)B&Bmacr; pairs collected with the CLEO detector we make the first observation of B decays to an eta(c) and a kaon. We measure branching fractions B(B+-->eta(c)K+) = (0.69(+0.26)(-0.21)+/-0.08+/-0.20)x10(-3) and B(B degrees -->eta(c)K degrees ) = (1.09(+0.55)(-0.42)+/-0.12+/-0.31)x10(-3), where the first error is statistical, the second is systematic, and the third is from the eta(c) branching fraction uncertainty. From these we extract the eta(c) decay constant in the factorization approximation, f(eta(c)) = 335+/-75 MeV. We also search for B decays to a chi(c0) and a kaon. No evidence for a signal is found and we set 90% C.L. upper limits: B(B+-->chi(c0)K+)<4.8x10(-4) and B(B degrees -->chi(c0)K degrees )<5.0x10(-4).

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.

We report the first observation of exclusive decays of the type B-->D(*)N_NX, where N is a nucleon. Using a sample of 9.7x10(6)B_B pairs collected with the CLEO detector operating at the Cornell Electron Storage Ring, we measure the branching fractions B(B0-->D(*-)p_p pi(+)) = (6.5(+1.3)(-1.2)+/-1.0)x10(-4) and B(B0-->D(*-)p_n) = (14.5(+3.4)(-3.0)+/-2.7)x10(-4). Antineutrons are identified by their annihilation in the CsI electromagnetic calorimeter.

In the Standard Model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix, or a departure from unitarity. We determine the CKM matrix element |Vcb| using a sample of 3 x 10^6 B B-bar events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B0-bar --> D*+ l nu-bar and B- --> D*0 l nu-bar decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate dGamma/dw. By extrapolating dGamma/dw to w=1, the kinematic end point at which the D* is at rest relative to the B, we extract the product |Vcb|F(1), where F(1) is the form factor at w=1. We find |Vcb| = 0.0431 +- 0.0013 (stat) +- 0.0018 (syst). We combined |Vcb|F(1) with theoretical results for F(1) to determine |Vcb| = 0.0469 +- 0.0014(stat) +- 0.0020(syst) +- 0.0018(theo). We also integrate the differential decay rate over w to obtain BF(B0-bar --> D*+ l nu-bar) = (6.09 +- 0.19 +- 0.40)% and BF(B- --> D*0 l nu-bar) = (6.50 +- 0.20 +- 0.43)%.

We present an observation and time-integrated rate measurement of the decay ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ produced in $9{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions near the $\ensuremath{\Upsilon}(4S)$ resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the time-integrated rate of ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ normalized to the rate of $\overline{{D}^{0}}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ to be ${0.0043}_{\ensuremath{-}0.0010}^{+0.0011}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0007(\mathrm{syst})$. This decay can be produced by doubly Cabibbo-suppressed decays or by the ${D}^{0}$ evolving into a $\overline{{D}^{0}}$ through mixing, followed by a Cabibbo-favored decay to ${K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$. We also found the $\mathrm{CP}$ asymmetry $A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({9}_{\ensuremath{-}22}^{+25})%$ be consistent with zero.

We report on a search for charmless hadronic B decays to the three-body final states K(0)(S)h(+)pi(-), K(+)h(-)pi(0), K(0)(S)h(+)pi(0) (h(+/-) denotes a charged pion or kaon), and their charge conjugates, using 13.5 fb(-1) of integrated luminosity produced near sqrt[s]=10.6 GeV, and collected with the CLEO detector. We observe the decay B-->K0pi(+)pi(-) with a branching fraction (50(+10)(-9)(stat.)+/-7(syst.))x10(-6) and the decay B-->K(*+)(892)pi(-) with a branching fraction (16(+6)(-5)(stat.)+/-2(syst.))x10(-6).

We have searched a sample of 9.6 million $B\overline{B}$ events for the lepton-flavor-violating decays $\stackrel{\ensuremath{\rightarrow}}{B}{\mathrm{he}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}},$ ${B}^{+}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{e}^{+}{e}^{+},$ ${B}^{+}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{e}^{+}{\ensuremath{\mu}}^{+},$ and ${B}^{+}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{+},$ where h is $\ensuremath{\pi},$ K, $\ensuremath{\rho},$ and ${K}^{*}(892),$ a total of sixteen modes. We find no evidence for these decays, and place 90% confidence level upper limits on their branching fractions that range from 1.0 to $8.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}.$

We report on a search for CP violation in the decay of D0 and D0B to Kshort pi+pi-. The data come from an integrated luminosity of 9.0 1/fb of e+e- collisions at sqrt(s) ~ 10 GeV recorded with the CLEO II.V detector. The resonance substructure of this decay is well described by ten quasi-two-body decay channels (K*-pi+, K*0(1430)-pi+, K*2(1430)-pi+, K*(1680)-pi+, Kshort rho, Kshort omega, Kshort f0(980), Kshort f2(1270), Kshort f0(1370), and the ``wrong sign'' K*+ pi-) plus a small non-resonant component. We observe no evidence for CP violation in the amplitudes and phases that describe the decay D0 to K_S^0 pi+pi-.

We determine the weak coupling /V(cb)/ between the b and c quarks using a sample of 3 x 10(6) BB; events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B-->D*l nu; decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate d Gamma/dw. By extrapolating d Gamma/dw to w=1, the kinematic end point at which the D* is at rest relative to the B, we extract the product /V(cb)/F(1), where F(1) is the form factor at w=1. Combined with theoretical results for F(1) we determine /V(cb)/=0.0469+/-0.0014(stat)+/-0.0020(syst)+/-0.0018(theor).

Using 12.7 fb(-1) of data collected with the CLEO detector at CESR, we observed two-photon production of the cc states chi(c0) and chi(c2) in their decay to pi(+)pi(-)pi(+)pi(-). We measured gamma(gammagamma)(chi(c))xB(chi(c)-->pi(+)pi(-)pi(+)pi(-)) to be 75+/-13(stat)+/-8(syst) eV for the chi(c0) and 6.4+/-1.8(stat)+/-0.8(syst) eV for the chi(c2), implying gamma(gammagamma)(chi(c0)) = 3.76+/-0.65(stat)+/-0.41(syst)+/-1.69(br) keV and gamma(gammagamma)(chi(c2)) = 0.53+/-0.15(stat)+/-0.06(syst)+/-0.22(br) keV. Also, cancellation of dominant experimental and theoretical uncertainties permits a precise comparison of gamma(gammagamma)(chi(c0))/gamma(gammagamma)(chi(c2)), evaluated to be 7.4+/-2.4(stat)+/-0.5(syst)+/-0.9(br), with QCD-based predictions.

Using 13.4 fb(-1) of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudoscalar charmonium in the decay eta(c)-->K(0)(S)K-/+pi(+/-). We have measured the eta(c) mass to be [2980.4+/-2.3 (stat)+/-0.6 (syst)] MeV and its full width as [27.0+/-5.8 (stat)+/-1.4 (syst)] MeV. We have determined the two-photon partial width of the eta(c) meson to be [7.6+/-0.8 (stat)+/-0.4 (syst)+/-2.3 (br)] keV, with the last uncertainty associated with the decay branching fraction.

We present new measurements of branching fractions for the color-favored decays B^- --> D^0 pi^- and Bbar^0 --> D^+ pi^-. Using 9.67 x 10^6 BBbar pairs collected with the CLEO detector, we obtain the branching fractions BR(B^- --> D^0 pi^- =3D (49.7 +/- 1.2 +/- 2.9 +/- 2.2) x 10^{-4} and BR(Bbar^0 --> D^+ pi^- =3D (26.8 +/- 1.2 +/- 2.4 +/- 1.2) x 10^{-4}. The first error is statistical, the second is systematic, and the third is due to the experimental uncertainty on the production ratio of charged and neutral B mesons in Upsilon(4S) decays. These results, together with the current world average for the color-suppressed branching fraction BR(Bbar^0 --> D^0 pi^0), are used to determine the cosine of the strong phase difference delta_I between the I=1/2 and I=3/2 isospin amplitudes. We find cos(delta_I) = 0.863 (+0.024 -0.023) (+0.036 -0.035) (+0.038 -0.030), and obtain a 90% confidence interval of 16.5 degrees < delta_I < 38.1 degrees. This non-zero value of \delta_I strongly suggests the presence of final state interactions in the Dpi system.

The tau decays to six-pion final states have been studied with the CLEO detector at the Cornell Electron Storage Ring. The measured branching fractions are B(tau(-)-->2pi(-)pi(+)3pi(0)nu(tau)) = (2.2+/-0.3+/-0.4)x10(-4) and B(tau(-)-->3pi(-)2pi(+)pi(0)nu(tau)) = (1.7+/-0.2+/-0.2)x10(-4). A search for substructure in these decays shows that they are saturated by intermediate states with eta or omega mesons. We present the first observation of the decay tau(-)-->2pi(-)pi(+)omega(nu)tau and the branching fraction is measured to be (1.2+/-0.2+/-0.1)x10(-4). The measured branching fractions are in good agreement with the isospin expectations but somewhat below the conserved-vector-current predictions.

The ratio of charged and neutral B meson production at the Upsilon(4S), f_{+-}/f_{00}, is measured through the decays B bar -> D* l- nu_l bar, reconstructed using a partial reconstruction method where the D* is detected only through a pion daughter from the decay D* -> D pi. Using data collected by the CLEO II detector, the charged and neutral B decays are measured in such a way that their ratio is independent of decay model, limited mainly by the uncertainty in the relative efficiency for detecting neutral and charged pions. This measurement yields the ratio of production fractions times the ratio of semileptonic branching fractions, f_{+-}b_{+}/f_{00}b_0. Assuming that b_+/b_0 is equal to the lifetime ratio tau_+/tau_0 and using the world average value of tau_+/tau_0 as input, we obtain f_{+-}/f_{00}=1.058+- 0.084+- 0.136.

Using the CLEO detector at the Cornell Electron Storage Ring, we have observed the Omega_c (css ground state) in the decay Omega_c -> Omega- e+ nu. We find a signal of 11.4 +- 3.8 (stat) events. The probability that we have observed a background fluctuation is 7.6 x 10-5. We measure BF(Omega_c -> Omega- e+ nu) x sigma(e+ e- -> Omega_c X) = (42.2 +- 14.1 (stat) +- 5.7 (syst)) fb and R = Gamma(Omega_c -> Omega- pi+)/Gamma(Omega_c -> Omega- e+ nu) = 0.41 +- 0.19 (stat) +- 0.04 (syst). This is the first statistically significant observation of an individual decay mode of the Omega_c in e+ e- annhiliation, and the first example of a baryon decaying via beta-emmision, where no quarks from the first generation participate in the reaction.

We search for the decay of the B0 meson into a pair of leptons in the suppressed channels B0→e+e−, B0→μ+μ− and in the lepton number violating channel B0→e±μ∓ in a sample of 9.7×106B¯B pairs recorded by CLEO detector. No signal is found, and the following upper limits on the branching fractions are established: B(B0→e+e−)<8.3×10−7, B(B0→μ+μ−)<6.1×10−7, B(B0→e±μ∓)<15×10−7 at 90% confidence level. A new lower limit on the Pati-Salam leptoquark mass MLQ>27TeV is established at 90% confidence level.Received 19 July 2000DOI:https://doi.org/10.1103/PhysRevD.62.091102©2000 American Physical Society

We report results of a search for B-->tau(nu) in a sample of 9.7 x 10(6) charged B meson decays. We exclusively reconstruct the companion B decay to suppress background. We set an upper limit on the branching fraction B(B-->tau(nu))<8.4 x 10(-4) at 90% confidence level. We also establish B(B+/--->K+/-nu(nu))<2.4 x 10(-4) at 90% confidence level.

Using data recorded with the CLEO II and CLEO II.V detector configurations at the Cornell Electron Storage Rings, we report the first observation and mass measurement of the ${\ensuremath{\Sigma}}_{c}^{*+}$ charmed baryon, and an updated measurement of the mass of the ${\ensuremath{\Sigma}}_{c}^{+}$ baryon. We find $M({\ensuremath{\Sigma}}_{c}^{*+})\ensuremath{-}M({\ensuremath{\Lambda}}_{c}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(231.0\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}2.0)\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$, and $M({\ensuremath{\Sigma}}_{c}^{+})\ensuremath{-}M({\ensuremath{\Lambda}}_{c}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(166.4\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\pm\else\textpm\fi{}0.3)\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$, where the errors are statistical and systematic, respectively.

We have searched a sample of $9.6\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events for the flavor-changing neutral current decays $B\ensuremath{\rightarrow}K{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ and $B\ensuremath{\rightarrow}{K}^{*}(892){\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$. We subject the latter decay to the requirement that the dilepton mass ${m}_{\ensuremath{\ell}\ensuremath{\ell}}$ exceed 0.5 GeV. There is no indication of a signal. We obtain the $90%$ confidence level upper limits $B(B\ensuremath{\rightarrow}K{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}})&lt;1.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $B(B\ensuremath{\rightarrow}{K}^{*}(892){\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}{)}_{{m}_{\ensuremath{\ell}\ensuremath{\ell}}&gt;0.5\mathrm{GeV}}&lt;3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also obtain an upper limit on the weighted average $0.65B(B\ensuremath{\rightarrow}K{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}})+0.35B(B\ensuremath{\rightarrow}{K}^{*}(892){\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}{)}_{{m}_{\ensuremath{\ell}\ensuremath{\ell}}&gt;0.5\mathrm{GeV}}&lt;1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. The weighted-average limit is only $50%$ above the standard model prediction.

Using the CLEO II detector operating at the CESR e+e- collider, we have measured the structure functions in the decay tau+/- --> pi+/- pi0 pi0 nu, based on a sample corresponding to 4*10E6 produced tau-pair events. We determine the integrated structure functions, which depend only on the three pion invariant mass, as well as the structure functions differential in the Dalitz plot. We extract model independent limits on non-axial-vector contributions from the measured structure functions as less than 16.6% of the total branching fraction, at the 95% confidence level. Separating the non-axial-vector contributions into scalar and vector contributions, we measure that scalars (vectors) contribute with less than 9.4% (7.3%) to the total branching ratio, at the 95% confidence level.

We present the first observation of the decay B-->J/psistraight phiK. Using 9.6x10(6) B&Bmacr; meson pairs collected with the CLEO detector, we have observed ten fully reconstructed B-->J/psistraight phiK candidates, whereas the estimated background is 0.5+/-0.2 event. We obtain a branching fraction of B(B-->J/psistraight phiK) = (8. 8(+3.5)(-3.0)[stat]+/-1.3[syst])x10(-5). This is the first observed B meson decay requiring the creation of an additional s&smacr; quark pair.

Using the combined CLEO II and CLEO II.V data sets of 9.1 fb(-1) at the Upsilon(4S), we measure properties of psi mesons produced directly from decays of the B meson, where "B" denotes an admixture of B+, B-, B0, and B;(0), and "psi" denotes either J/psi(1S) or psi(2S). We report first measurements of psi polarization in B-->psi(direct)X: alpha(psi(1S))=-0.30(+0.07)(-0.06)+/-0.04 and alpha(psi(2S))=-0.45(+0.22)(-0.19)+/-0.04. We also report improved measurements of the momentum distributions of psi produced directly from B decays, correcting for measurement smearing. Finally, we report measurements of the inclusive branching fraction for B-->psiX and B-->chi(c1)X.

Based on a measurement of high momentum eta' production in B decays, we determine the charmless inclusive B -> eta'X_(nc) branching fraction in the lab-frame momentum interval 2.0<P_eta'<2.7 GeV/c. Using 9.7x10^6 BBbar pairs collected at the Upsilon(4S) center-of-mass energy with the CLEO II and II.V detector configurations, we find Br(B -> eta'X_(nc)) = (4.6 +- 1.1 +- 0.4 +- 0.5)x 10^(-4) in the 2.0<P_(eta')<2.7 GeV/c momentum range, where the uncertainties are statistical, systematic, and from subtraction of background from B decays to charm, respectively.

Using $4.68{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected with the CLEO II detector at the Cornell Electron Storage Ring, we have studied $\ensuremath{\tau}$ radiative decays ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\tau}}{\ensuremath{\mu}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\gamma}$ and ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\tau}}{e}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{e}\ensuremath{\gamma}$. For a 10 MeV minimum photon energy in the $\ensuremath{\tau}$ rest frame, the branching fraction for radiative $\ensuremath{\tau}$ decay to a muon or electron is measured to be $(3.61\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.35)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ or $(1.75\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.17)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, respectively. The branching fractions are in agreement with standard model theoretical predictions.

We report on the observation of B-> D(*) pi+ pi- pi- pi^o decays. The branching ratios for D*+ and D*o are (1.72+/-0.14+/-0.24)% and (1.80+/-0.24+/-0.27)%, respectively. Each final state has a D* omega pi- component, with branching ratios (0.29+/-0.03+/-0.04)% and (0.45+/-0.10+/-0.07)% for the D*+ and D*o modes, respectively. We also observe B -> D omega pi- decays. The branching ratios for D+ and Do are (0.28+/-0.05+/-0.04)% and (0.41+/-0.07+/-0.06)%, respectively. A spin parity analysis of the D omega pi- final state prefers a wide 1^- resonance. A fit to the omega pi- mass spectrum finds a central mass of (1349+/-25^{+10}_{-5}) MeV and width of (547+/-86^{+46}_{-45}) MeV. We identify this object as the rho(1450) or the \rho'.

Measurements of the evolution with redshift of the number density of massive galaxy clusters are used to constrain the energy density of massive neutrinos and so the sum of neutrino masses $\ensuremath{\sum}_{}^{}{m}_{\ensuremath{\nu}}$. We consider a spatially flat cosmological model with cosmological constant, cold dark matter, baryonic matter, and massive neutrinos. Accounting for the uncertainties in the measurements of the relevant cosmological parameters we obtain a limit of $\ensuremath{\sum}_{}^{}{m}_{\ensuremath{\nu}}&lt;2.4\text{ }\text{ }\mathrm{eV}$ (95% C.L.).

We present final measurements of thirteen 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, pp, p Λ, and Λ Λ, as well as a new determination of the ratio B(B → DK)/B(B → Dπ).The results are based on the full CLEO II and CLEO III data samples totalling 15.3 fb -1 at the Υ(4S), and supercede previously published results.

This article describes improved measurements by CLEO of the ${B}^{0}\ensuremath{\rightarrow}{D}_{s}^{+}{D}^{*\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{D}_{s}^{*+}{D}^{*\ensuremath{-}}$ branching fractions, and first evidence for the decay ${B}^{+}\ensuremath{\rightarrow}{D}_{s}^{(*)+}{D}^{**0},$ where ${D}^{**0}$ represents the sum of the ${D}_{1}{(2420)}^{0},$ ${D}_{2}^{*}{(2460)}^{0},$ and ${D}_{1}{(j=1/2)}^{0}L=1$ charm meson states. Also reported is the first measurement of the ${D}_{s}^{*+}$ polarization in the decay ${B}^{0}\ensuremath{\rightarrow}{D}_{s}^{*+}{D}^{*\ensuremath{-}}.$ A partial reconstruction technique, employing only the fully reconstructed ${D}_{s}^{+}$ and slow pion ${\ensuremath{\pi}}_{s}^{\ensuremath{-}}$ from the ${D}^{*\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}_{s}^{\ensuremath{-}}$ decay, enhances sensitivity. The observed branching fractions are $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{D}_{s}^{+}{D}^{*\ensuremath{-}})=(1.10\ifmmode\pm\else\textpm\fi{}0.18\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.28)%,$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{D}_{s}^{*+}{D}^{*\ensuremath{-}})=(1.82\ifmmode\pm\else\textpm\fi{}0.37\ifmmode\pm\else\textpm\fi{}0.24\ifmmode\pm\else\textpm\fi{}0.46)%$, and $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}{D}_{s}^{(*)+}{D}^{**0})=(2.73\ifmmode\pm\else\textpm\fi{}0.78\ifmmode\pm\else\textpm\fi{}0.48\ifmmode\pm\else\textpm\fi{}0.68)%,$ where the first error is statistical, the second systematic, and the third is the uncertainty in the ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{+}$ branching fraction. The measured ${D}_{s}^{*+}$ longitudinal polarization, ${\ensuremath{\Gamma}}_{L}/\ensuremath{\Gamma}=(50.6\ifmmode\pm\else\textpm\fi{}13.9\ifmmode\pm\else\textpm\fi{}3.6)%,$ is consistent with the factorization prediction of 54%.

We report the first observation of the exclusive decays B-->D((*))K(*-), using 9.66 x 10(6) BB pairs collected at the Upsilon(4S) with the CLEO detector. We measure the following branching fractions: B(B--->D(0)K(*-)) = (6.1+/-1.6+/-1.7)x10(-4), B(B(0)-->D(+)K(*-)) = (3.7+/-1.5+/-1.0)x10(-4), B(B(0)-->D(*+)K(*-)) = (3.8+/-1.3+/-0.8)x10(-4), and B(B--->D(*0)K(*-)) = (7.7+/-2.2+/-2.6)x10(-4). The B-->D(*)K(*-) branching ratios are the averages of those corresponding to the 00 and 11 helicity states. The errors shown are statistical and systematic, respectively.

Continuing our studies of radiative Upsilon(1S) decays, we report on a search for Upsilon to gamma eta and Upsilon to gamma f_{J}(2220) in 61.3 pb^{-1} of e^{+}e^{-} data taken with the CLEO II detector at the Cornell Electron Storage Ring. For the gamma eta search the three decays of the eta meson to pi^{+}pi^{-}pi^{0}, pi^{0}pi^{0}pi^{0}, and gamma gamma were investigated. We found no candidate events in the two (3\pi)^{0} modes and no significant excess over expected backgrounds in the gamma gamma mode to set a limit on the branching fraction of B(Upsilon to gamma eta) < 2.1 x 10^{-5} at 90% C.L. The three charged two-body final states h h-bar (h = pi^{+}, K^{+}, p) were investigated for f_{J}(2220) production, with one, one, and two events found, respectively. Limits at 90% C.L. of B(\Upsilon to gamma f_{J}) x B(f_{J} to h h-bar) ~ 1.5 x 10^{-5} have been set for each of these modes. We compare our results to measurements of other radiative Upsilon decays, to measurements of radiative J/psi decays, and to theoretical predictions.

We search for CP non-conservation in the decays of tau leptons produced via $e^+ e^-$ annihilation at $\sqrt{s}\sim$ 10.6 GeV. The method uses correlated decays of pairs of tau leptons, each decaying to the $\pi \pi^0 \nu_{\tau}$ final state. The search is done within the framework of a model with a scalar boson exchange. In an analysis of a data sample corresponding to 12.2 million produced tau pairs collected with the CLEO detector, we find no evidence of violation of CP symmetry. We obtain a limit on the imaginary part of the coupling constant parameterizing the relative contribution of diagrams that would lead to CP violation to be $-0.046 <\Im(\Lambda) < 0.022$ at 90% C.L. This result provides a restriction on CP non-conservation in the tau lepton decays. As a cross check, we study the decay angular distribution and perform a model-independent search for a CP violation effect of a scalar exchange in single $\tau\to \pi\pi^0\nu_\tau$ decays. The limit on the imaginary part of the $\tau$ scalar coupling is $-0.033 < \Im(\Lambda) < 0.089$ at 90% C.L.

We have used the CLEO II detector to study the multiplicity of charged particles in the decays of B mesons produced at the Υ(4S) resonance. Using a sample of 1.5×106 B meson pairs, we find the mean inclusive charged particle multiplicity to be 10.71±0.02+0.21−0.15 for the decay of the pair. This corresponds to a mean multiplicity of 5.36±0.01+0.11−0.08 for a single B meson. Using the same data sample, we have also extracted the mean multiplicities in semileptonic and nonleptonic decays. We measure a mean of 7.82±0.05+0.21−0.19 charged particles per B¯B decay when both mesons decay semileptonically. When neither B meson decays semileptonically, we measure a mean charged particle multiplicity of 11.62±0.04+0.24−0.18 per B¯B pair.Received 8 September 1999DOI:https://doi.org/10.1103/PhysRevD.61.072002©2000 American Physical Society

We present a study of three ${B}^{0}$ decay modes useful for time-dependent $\mathrm{CP}$ asymmetry measurements. From a sample of $9.7\ifmmode\times\else\texttimes\fi{}{10}^{6} B\overline{B}$ meson pairs collected with the CLEO detector, we have reconstructed ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}_{S}^{0},$ ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}{K}_{S}^{0},$ and ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}$ decays. The latter two decay modes have been observed for the first time. We describe a ${K}_{S}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ detection technique and its application to the reconstruction of the decay ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}_{S}^{0}.$ Combining the results obtained using ${K}_{S}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}_{S}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays, we determine $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{0})=(9.5\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ where the first uncertainty is statistical and the second one is systematic. We also obtain $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}{K}^{0}{)=(3.9}_{\ensuremath{-}1.3}^{+1.9}\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}{)=(2.5}_{\ensuremath{-}0.9}^{+1.1}\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}.$

We report on a search for a CP-violating asymmetry in the charmless hadronic decay B -> K*(892)+- pi-+, using 9.12 fb^-1 of integrated luminosity produced at \sqrt{s}=10.58 GeV and collected with the CLEO detector. We find A_{CP}(B -> K*(892)+- pi-+) = 0.26+0.33-0.34(stat.)+0.10-0.08(syst.), giving an allowed interval of [-0.31,0.78] at the 90% confidence level.

Three-dimensional image reconstruction in medical applications (PET or X-ray CT) utilizes sophisticated filter algorithms to linear trajectories of coincident photon pairs or x-rays. The goal is to reconstruct an image of an emitter density distribution. In a similar manner, tracks in particle physics originate from vertices that need to be distinguished from background track combinations. In this study it is investigated if vertex reconstruction in high energy proton collisions may benefit from medical imaging methods. A new method of vertex finding, the Medical Imaging Vertexer (MIV), is presented based on a three-dimensional filtered backprojection algorithm. It is compared to the open-source RAVE vertexing package. The performance of the vertex finding algorithms is evaluated as a function of instantaneous luminosity using simulated LHC collisions. Tracks in these collisions are described by a simplified detector model which is inspired by the tracking performance of the LHC experiments. At high luminosities (25 pileup vertices and more), the medical imaging approach finds vertices with a higher efficiency and purity than the RAVE “Adaptive Vertex Reconstructor” algorithm. It is also much faster if more than 25 vertices are to be reconstructed because the amount of CPU time rises linearly with the number of tracks whereas it rises quadratically for the adaptive vertex fitter AVR.

CLEO III is the new experimental phase of the CLEO experiment at the CESR accelerator. Both the accelerator and the detector have recently been upgraded. A new charged particle tracking system with the addition of a ring imaging Cherenkov particle identification system has been installed. A major part of the tracking system upgrade was the construction of a new four-layer double-sided silicon tracker with 93% solid angle coverage and new readout electronics. The CLEO III upgrade was completed in February 2000 with the installation of the silicon detector. CLEO III has finished the commissioning phase and is now taking data. The design of the detector and first performance results are presented here.

Using data collected on the Υ(4S) resonance and the nearby continuum by the CLEO detector at the Cornell Electron Storage Ring, we have searched for the semileptonic decay of B mesons to ep¯ inclusive final states. We obtain an upper limit for b→c decays of B(B→p¯e−ν¯eX)<5.9×10−4. For the b→u decay, we find an upper limit of B(B−→pp¯e−ν¯e)<1.2×10−3 based on a V−A model, while a phase space model gives an upper limit of B(B−→pp¯e−ν¯e)<5.2×10−3. All upper limits are measured at the 90% confidence level.Received 8 April 2003DOI:https://doi.org/10.1103/PhysRevD.68.012004©2003 American Physical Society

Using $13.3{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ data recorded with the CLEO II and CLEO II.V detector configurations at CESR, we have searched for ${f}_{J}(2220)$ decays to ${K}_{S}^{0}{K}_{S}^{0}$ in untagged two-photon interactions. We report an upper limit on the product of the two-photon partial width and the branching fraction, ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}\ensuremath{\gamma}}\mathcal{B}({f}_{J}(2220)\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{S}^{0}),$ of less than 1.1 eV at the 95% confidence level; systematic uncertainties are included. This data set is four times larger than that used in the previous CLEO publication.

Using 13.53 fb(-1) of CLEO data, we have measured the ratios of the branching fractions R(+)(e),R(+)(mu) and the combined branching fraction ratio R(+)(l), defined by R(+)(l)=[B(D+-->K(*0)l(+)nu(l))]/[B(D+-->K-pi(+)pi(+))]. We find R(+)(e)=0.74+/-0.04+/-0.05, R(+)(mu)=0.72+/-0.10+/-0.05, and R(+)(l)=0.74+/-0.04+/-0.05, where the first and second errors are statistical and systematic, respectively. The known branching fraction B(D+-->K-pi(+)pi(+)) leads to B(D+-->K(*0)e(+)nu(e))=(6.7+/-0.4+/-0.5+/-0.4)%, B(D+-->K(*0)mu(+)nu(mu))=(6.5+/-0.9+/-0.5+/-0.4)%, and B(D+-->K(*0)l(+)nu(l))=(6.7+/-0.4+/-0.5+/-0.4)%, where the third error is due to the uncertainty in B(D+-->K-pi(+)pi(+)).

Abstract The Self-Organizing-Map (SOM) is a widely used neural network for dimensional reduction and clustering. It has yet to find its use in high energy physics. This paper discusses two applications of SOM: first, we find map regions with a high relative content of a rare process ( H → WW *). Second we obtain Monte Carlo normalization factors for different physics processes by fitting the dimensionally reduced representation. Analysis and training are performed on ATLAS open data.

We have searched for the baryon-containing radiative penguin decays ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{p}\ensuremath{\gamma}$ and ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{0}\overline{p}\ensuremath{\gamma},$ using a sample of $9.7\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at the $\ensuremath{\Upsilon}(4S)$ with the CLEO detector. We find no evidence for either, and set 90% confidence level upper limits of $\mathcal{B}{(B}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{p}\ensuremath{\gamma})+0.3\mathcal{B}{(B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{0}\overline{p}\ensuremath{\gamma}){]}_{{E}_{\ensuremath{\gamma}}&gt;2.0 \mathrm{GeV}}&lt;3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $[\mathcal{B}{(B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{0}\overline{p}\ensuremath{\gamma})+0.4\mathcal{B}{(B}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{p}\ensuremath{\gamma}){]}_{{E}_{\ensuremath{\gamma}}&gt;2.0 \mathrm{GeV}}&lt;6.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}.$ From the latter, we estimate $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{B}{X}_{s}\ensuremath{\gamma}{,X}_{s} \mathrm{containing}\mathrm{}\mathrm{baryons}{)}_{{E}_{\ensuremath{\gamma}}&gt;2.0 \mathrm{GeV}}&lt;3.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}.$ This limit implies upper limits on corrections to CLEO's recent measurement of branching fraction, mean photon energy, and variance in photon energy from $\stackrel{\ensuremath{\rightarrow}}{b}s\ensuremath{\gamma}$ that are less than half the combined statistical and systematic errors quoted on these quantities.

We report on the observation of ${B}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays. The branching ratio is $(0.30\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.06)%.$ Interest in this particular mode was sparked by Ligeti, Luke and Wise who propose it as a way to check the validity of factorization tests in ${B}^{0}\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decays.

Calorimeter-assisted track finding algorithm takes advantage of the finely segmented electromagnetic calorimeter proposed for the SiD detector concept by looking for "MIP stubs" produced by charged particles in the calorimeter, and using them as seeds for pattern recognition in the tracker. The algorithm allows for efficient reconstruction of tracks that cannot be found using seeds provided by the vertex detector, even if standalone pattern recognition in the outer tracker is difficult. The algorithm has been implemented as a package in the org.lcsim framework. Current status of the package and its performance in non-prompt tracks reconstruction are described.

From a data sample of 29058 ${\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ decays observed in the CLEO detector we derive a 95% confidence upper limit on the tau neutrino mass of 28 MeV.

Abstract Due to the large size of datasets accumulated at the LHC, analysis results are often limited by systematic effects. The application of multivariate analysis techniques such as Boosted Decision Trees (BDTs) or artificial neural nets typically maximises the statistical significance of the results while ignoring systematic effects. There is a known strategy to mitigate systematic effects for neural nets but no firmly established procedure for BDTs. We present a method to incorporate systematic uncertainties into a BDT, the systematics-aware BDT (saBDT). We evaluate our method on open data of the ATLAS Higgs machine learning challenge and compare our results to neural nets trained with an adversary.

The CLEO III detector has recently commenced data taking at the Cornell electron Storage Ring (CESR). One important component of this detector is a 4 layer double-sided silicon tracker with 93% solid angle coverage. This detector ranges in size and number of readout channels between the LEP and LHC silicon detectors. In order to reach the detector performance goals of signal-to-noise ratios greater than 15:1 low noise front-end electronics together with highly regulated low noise power supplies were used. In this paper we describe the low-noise power supply system and associated monitoring and safety features used by the CLEO III silicon tracker.

The design and operation of the CLEO III silicon vertex detector is described in this report. This detector consists of four layers of double-sided silicon wafers covering 93% of the solid angle. After initially meeting its signal-to-noise and spatial resolution design goals, the r−φ side efficiency of layers 1 and 2 decreased dramatically due to radiation-induced sensor effects.

We have searched for the two-body decay of the B meson to a light pseudoscalar meson h = π γ , K γ , K 0 S and a massless neutral feebly interacting particle X° such as the familon, the Nambu-Goldstone boson associated witha spontaneously broken global family symmetry. We find no significant signal by analyzing a data sample containing 9.7 X 10 6 BB mesons collected with the CLEO detector at the Cornell Electron Storage Ring, and set 90% C.L. upper limits B(B γ → h γ X 0 ) = 4.9 X 10 - 5 and B(B 0 → K 0 S X 0 ) = 5.3 × 10 - 5 . These limits correspond to a lower bound of approximately 10 8 GeV on the family symmetry breaking scale with vector coupling involving the third generation of quarks.

B. I. Eisenstein,1 J. Ernst,1 G. E. Gladding,1 G. D. Gollin,1 R. M. Hans,1 E. Johnson,1 I. Karliner,1 M. A. Marsh,1 C. Plager,1 C. Sedlack,1 M. Selen,1 J. J. Thaler,1 J. Williams,1 K. W. Edwards,2 A. J. Sadoff,3 R. Ammar,4 A. Bean,4 D. Besson,4 X. Zhao,4 S. Anderson,5 V. V. Frolov,5 Y. Kubota,5 S. J. Lee,5 R. Poling,5 A. Smith,5 C. J. Stepaniak,5 J. Urheim,5 S. Ahmed,6 M. S. Alam,6 S. B. Athar,6 L. Jian,6 L. Ling,6 M. Saleem,6 S. Timm,6 F. Wappler,6 A. Anastassov,7 E. Eckhart,7 K. K. Gan,7 C. Gwon,7 T. Hart,7 K. Honscheid,7 D. Hufnagel,7 H. Kagan,7 R. Kass,7 T. K. Pedlar,7 J. B. Thayer,7 E. von Toerne,7 M. M. Zoeller,7 S. J. Richichi,8 H. Severini,8 P. Skubic,8 A. Undrus,8 V. Savinov,9 S. Chen,10 J. W. Hinson,10 J. Lee,10 D. H. Miller,10 E. I. Shibata,10 I. P. J. Shipsey,10 V. Pavlunin,10 D. Cronin-Hennessy,11 A. L. Lyon,11 E. H. Thorndike,11 T. E. Coan,12 V. Fadeyev,12 Y. S. Gao,12 Y. Maravin,12 I. Narsky,12 R. Stroynowski,12 J. Ye,12 T. Wlodek,12 M. Artuso,13 K. Benslama,13 C. Boulahouache,13 K. Bukin,13 E. Dambasuren,13 G. Majumder,13 R. Mountain,13 T. Skwarnicki,13 S. Stone,13 J. C. Wang,13 A. Wolf,13 S. Kopp,14 M. Kostin,14 A. H. Mahmood,15 S. E. Csorna,16 I. Danko,16 K. W. McLean,16 Z. Xu,16 R. Godang,17 G. Bonvicini,18 D. Cinabro,18 M. Dubrovin,18 S. McGee,18 A. Bornheim,19 E. Lipeles,19 S. P. Pappas,19 A. Shapiro,19 W. M. Sun,19 A. J. Weinstein,19 D. E. Jaffe,20 R. Mahapatra,20 G. Masek,20 H. P. Paar,20 D. M. Asner,21 A. Eppich,21 T. S. Hill,21 R. J. Morrison,21 R. A. Briere,22 G. P. Chen,22 T. Ferguson,22 H. Vogel,22 J. P. Alexander,23 C. Bebek,23 B. E. Berger,23 K. Berkelman,23 F. Blanc,23 V. Boisvert,23 D. G. Cassel,23 P. S. Drell,23 J. E. Duboscq,23 K. M. Ecklund,23 R. Ehrlich,23 P. Gaidarev,23 R. S. Galik,23 L. Gibbons,23 B. Gittelman,23 S. W. Gray,23 D. L. Hartill,23 B. K. Heltsley,23 L. Hsu,23 C. D. Jones,23 J. Kandaswamy,23 D. L. Kreinick,23 M. Lohner,23 A. Magerkurth,23 H. Mahlke-Kruger,23 T. O. Meyer,23 N. B. Mistry,23 E. Nordberg,23 M. Palmer,23 J. R. Patterson,23 D. Peterson,23 D. Riley,23 A. Romano,23 H. Schwarthoff,23 J. G. Thayer,23 D. Urner,23 B. Valant-Spaight,23 G. Viehhauser,23 A. Warburton,23 P. Avery,24 C. Prescott,24 A. I. Rubiera,24 H. Stoeck,24 J. Yelton,24 G. Brandenburg,25 A. Ershov,25 D. Y.-J. Kim,25 and R. Wilson25

Based on a high statistics e+e−→c¯c data sample, we report on the inclusive rate for charmed baryons to decay into Λ particles using charm-event tagging. We select e+e−→c¯c events which have a clear anti-charm tag and measure the Λ content in the hemisphere opposite the tag (charge conjugate modes are implicit). This allows us to determine the product branching fraction BΛ=B(→cΘcX)×B(Θc→ΛX), where Θc represents a sum over all charmed baryons produced in e+e− fragmentation at √s=10.5 GeV, given our specific tags. We obtain BΛ=(1.87±0.03±0.33)%. Received 28 April 2000DOI:https://doi.org/10.1103/PhysRevD.62.092007©2000 American Physical Society

KASP (Kansas Advanced Semiconductor Project) completed the new Layer 0 upgrade for D0, assumed key electronics projects for the US CMS project, finished important new physics measurements with the D0 experiment at Fermilab, made substantial contributions to detector studies for the proposed e+e- international linear collider (ILC), and advanced key initiatives in non-accelerator-based neutrino physics.

The recent upgrade of the DØ detector for the Tevatron Run II significantly improved the B reconstruction capabilities of DØ. Based on an integrated luminosity of about 115 pb−1, we introduce the reader to DØ’s B reconstruction techniques and present first results in B spectroscopy as well as an improved limit for Bs → μ−μ+.

D. M. Asner, H. N. Nelson, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, N. E. Adam, J. P. Alexander, K. Berkelman, V. Boisvert, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Kruger, T. O. Meyer, N. B. Mistry, J. R. Patterson, D. Peterson, J. Pivarski, S. J. Richichi, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, T. Wilksen, A. Warburton, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, K. Benslama, C. Cawlfield, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, D. Besson, X. Zhao, S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. Saleem, F. Wappler, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, M. M. Zoeller, H. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P. J. Shipsey, D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, E. Dambasuren, O. Dorjkhaidav, N. Horwitz, G. C. Moneti, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, and A. J. Weinstein

S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, K. Benslama, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, D. Besson, X. Zhao, S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. Saleem, F. Wappler, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, M. M. Zoeller, H. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P. J. Shipsey, D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, E. Dambasuren, O. Dorjkhaidav, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, N. E. Adam, J. P. Alexander, K. Berkelman, V. Boisvert, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. MahlkeKruger, T. O. Meyer, N. B. Mistry, J. R. Patterson, D. Peterson, J. Pivarski, S. J. Richichi, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, T. Wilksen, A. Warburton, and M. Weinberger

N. E. Adam, J. P. Alexander, C. Bebek, B. E. Berger, K. Berkelman, F. Blanc, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Kruger, T. O. Meyer, N. B. Mistry, E. Nordberg, M. Palmer, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, B. Valant-Spaight, G. Viehhauser, A. Warburton, M. Weinberger, S. B. Athar, P. Avery, H. Stoeck, J. Yelton, G. Brandenburg, A. Ershov, D. Y. J. Kim, R. Wilson, K. Benslama, B. I. Eisenstein, J. Ernst, G. D. Gollin, R. M. Hans, I. Karliner, N. Lowrey, M. A. Marsh, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, R. Ammar, D. Besson, X. Zhao, S. Anderson, V. V. Frolov, Y. Kubota, S. J. Lee, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, S. Ahmed, M. S. Alam, L. Jian, M. Saleem, F. Wappler, E. Eckhart, K. K. Gan, C. Gwon, T. Hart, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, J. B. Thayer, E. von Toerne, T. Wilksen, M. M. Zoeller, S. J. Richichi, H. Severini, P. Skubic, S. A. Dytman, S. Nam, V. Savinov, S. Chen, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, E. I. Shibata, I. P. J. Shipsey, D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, I. Narsky, R. Stroynowski, J. Ye, M. Artuso, C. Boulahouache, K. Bukin, E. Dambasuren, R. Mountain, T. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, Z. Xu, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, G. Masek, H. P. Paar, R. Mahapatra, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, and H. Vogel

N. E. Adam, J. P. Alexander, K. Berkelman, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Kruger, T. O. Meyer, N. B. Mistry, J. R. Patterson, D. Peterson, J. Pivarski, S. J. Richichi, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, T. Wilksen, A. Warburton, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, K. Benslama, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, A. Bean, D. Besson, X. Zhao, S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. Saleem, F. Wappler, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, M. M. Zoeller, H. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P. J. Shipsey, D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, K. Bukin, E. Dambasuren, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, and H. Vogel

The CLEO detector is located at the CESR e+e- collider in Ithaca, NY. CLEO's wide range of experimental measurements in b-hadron decays is represented by improved measurements of Vcb and Vub, rare B decays, and bb-bar spectroscopy. New experimental results in exclusive hadronic transitions will aid theorists in developing a theory of hadronic B decays. Such a theory will have consequences for the extraction of angles of the unitarity triangle, especially gamma. Recently, the CLEO collaboration has shifted its focus towards precision measurements at lower energies. Based on the new Y(3S) data, we present the observation of a new bound bb-bar state. An outlook on the planned running at tau/charm-energies (CLEO-c) is given and implications for b-physics are discussed.

The CLEO-III silicon vertex detector is a 4-layer device with double-sided silicon sensors arranged in a barrel design, covering 93% of the solid angle. After initially meeting its design goals of signal-to-noise performance and spatial resolution, the signal efficiency deteriorated on the rφ sensor side in the two innermost layers due to radiation induced sensor effects. Operation of the two outermost layers and the z-coordinate readout in all layers is stable.

The CLEO detector is located at the CESR e+e- collider in Ithaca, NY. CLEO's wide range of experimental measurements in b-hadron decays is represented by improved measurements of Vcb and Vub, rare B decays, and bb-bar spectroscopy. New experimental results in exclusive hadronic transitions will aid theorists in developing a theory of hadronic B decays. Such a theory will have consequences for the extraction of angles of the unitarity triangle, especially gamma. Recently, the CLEO collaboration has shifted its focus towards precision measurements at lower energies. Based on the new Y(3S) data, we present the observation of a new bound bb-bar state. An outlook on the planned running at tau/charm-energies (CLEO-c) is given and implications for b-physics are discussed.

Based on the CLEO II and II.5 data sets CLEO has observed several new rare and hadronic B decays and also updated the b-&gt;s+gamma measurement.

Based on the CLEO II and II.5 data sets CLEO has observed several new rare and hadronic B decays and also updated the b→sγ measurement.Rare and hadronic B meson decays provide an excellent experimental field to test the Standard Model of particle physics.While effects like CP-violation have been observed in hadronic B decays B→J/ΨK 0 s , the extraction of CKM-matrix elements and phases might still prove difficult since many decay channels have to be measured and effects like final state interactions, re-scattering and interference between dominant and suppressed decay amplitudes have to be understood [1,2].This makes it necessary to study extensively all rare and hadronic B decays to gain full understanding of the dynamics in B decays.The results presented here are based on the CLEO II and II.5 data sets.The CLEO detector is located at the CESR e + e -collider in Ithaca, NY.An integrated luminosity of 9.1 fb -1 was collected on the Υ(4S) resonance and 4.3 fb -1 ∼60 MeV below the resonance to study the continuum background from e + e -→ qq.The kinematics of the Υ(4S) decay, in which two B mesons with equal masses are produced, allow us to define two sensitive variables: the Beam-constrained mass M B = E 2 beam -P 2 B and the Energy difference ∆E = E B -E beam , where E B and P B are the measured energy and momentum of the B candidate and E beam is the beam energy.* Speaker.