Y. Maravin

We have measured the branching fraction and photon energy spectrum for the radiative penguin process b-->s gamma. We find Beta(b-->s gamma) = (3.21+/-0.43+/-0.27(+0.18)(-0.10))x10(-4), where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, <E( gamma)> = 2.346+/-0.032+/-0.011 GeV, and <E(2)(gamma)>-<E(gamma)>(2) = 0.0226+/-0.0066+/-0.0020 GeV(2), where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/M(3)(B) and beta(0)alpha(2)(s)) the heavy quark effective theory parameter Lambda = 0.35+/-0.08+/-0.10 GeV.

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 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 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

Gravitational waves potentially represent our only direct probe of the universe when it was less than one second old. In particular, first-order phase transitions in the early universe can generate a stochastic background of gravitational waves which may be detectable today. We briefly summarize the physical sources of gravitational radiation from phase transitions and present semianalytic expressions for the resulting gravitational wave spectra from three distinct realistic sources: bubble collisions, turbulent plasma motions, and inverse-cascade helical magnetohydrodynamic turbulence. Using phenomenological parameters to describe phase transition properties, we determine the region of parameter space for which gravitational waves can be detected by the proposed Laser Interferometer Space Antenna. The electroweak phase transition is detectable for a wide range of parameters.

We consider the generation of gravitational waves by primordial helical inverse-cascade magnetohydrodynamic (MHD) turbulence produced by bubble collisions at the electroweak phase transition. We extend the previous study [1] by considering both currently discussed models of MHD turbulence. For popular electroweak phase transition parameter values, the generated gravitational wave spectrum is only weakly dependent on the MHD turbulence model. Compared with the unmagnetized electroweak phase transition case, the spectrum of MHD-turbulence-generated gravitational waves peaks at lower frequency with larger amplitude and can be detected by the proposed Laser Interferometer Space Antenna.

We provide a pedagogical introduction to extensions of the Standard Model in which the Higgs is composite. These extensions are known as models of dynamical electroweak symmetry breaking or, in brief, Technicolor. Material covered includes: motivations for Technicolor, the construction of underlying gauge theories leading to minimal models of Technicolor, the comparison with electroweak precision data, the low-energy effective theory, the spectrum of the states common to most of the Technicolor models, the decays of the composite particles and the experimental signals at the Large Hadron Collider. The level of the presentation is aimed at readers familiar with the Standard Model but who have little or no prior exposure to Technicolor. Several extensions of the Standard Model featuring a composite Higgs can be reduced to the effective Lagrangian introduced in the text. We establish the relevant experimental benchmarks for Vanilla, Running, Walking, and Custodial Technicolor, and a natural fourth family of leptons, by laying out the framework to discover these models at the Large Hadron Collider.

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).

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.

We describe the design, construction and performance of a Ring Imaging Cherenkov Detector (RICH) constructed to identify charged particles in the CLEO experiment. Cherenkov radiation occurs in LiF crystals, both planar and ones with a novel “sawtooth”-shaped exit surface. Photons in the wavelength interval 135–165 nm are detected using multi-wire chambers filled with a mixture of methane gas and triethylamine vapor. Excellent π/K separation is demonstrated.

We briefly describe the design, construction and performance of the LiF-Tea RICH detector built to identify charged particles in the CLEO III experiment. Excellent pion/kaon separation is demonstrated.

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.

A primordial magnetic field in the early universe will cause Faraday rotation of the linear polarization of the cosmic microwave background generated via Compton scattering at the surface of last scattering. This rotation induces a nonzero parity-odd (B-mode) polarization component. The Wilkinson Microwave Anisotropy Probe 5-year data puts an upper limit on the magnitude of the B-polarization power spectrum; assuming that the B-polarization signal is totally due to the Faraday rotation effect, the upper limits on the comoving amplitude of a primordial stochastic magnetic field range from $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ to $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}\text{ }\text{ }\mathrm{G}$ on a comoving length scale of 1 Mpc, depending on the power spectrum of the magnetic field.

We search for CP-violating charge asymmetries (alpha(CP)) in the B meson decays to K(+/-)pi(-/+), K(+/-)pi(0), K(0)(S)pi(+/-), K(+/-)eta('), and omega pi(+/-). Using 9.66 million upsilon(4S) decays collected with the CLEO detector, the statistical precision on alpha(CP) is in the range of +/-0.12 to +/-0.25 depending on decay mode. While CP-violating asymmetries of up to +/-0.5 are possible within the standard model, the measured asymmetries are consistent with zero in all five decay modes studied.

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 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 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 $|{V}_{\mathrm{ub}}|=(3.17\ifmmode\pm\else\textpm\fi{}{0.17}_{\ensuremath{-}0.17\ensuremath{-}0.39}^{+0.16+0.53}\ifmmode\pm\else\textpm\fi{}0.03)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}.$

We consider different renormalizable models of Lorentz invariance violation. We show that the limits on birefringence of the propagation of cosmic microwave background photons from the five year data of the Wilkinson Microwave Anisotropy Probe (WMAP) can be translated into a limit of Lorentz symmetry violation. The obtained limits on Lorentz invariance violation are stronger than other published limits. We also cast them in terms of limits on a birefringent effective photo mass and on a polarization dependence of the speed of light.

We study primordial magnetic field effects on the matter perturbations in the universe. We assume magnetic field generation prior to the big bang nucleosynthesis (BBN), i.e., during the radiation-dominated epoch of the universe expansion, but do not limit analysis by considering a particular magnetogenesis scenario. Contrary to previous studies, we limit the total magnetic field energy density and not the smoothed amplitude of the magnetic field at large (of the order of 1 Mpc) scales. We review several cosmological signatures, such as halo abundance, thermal Sunyaev–Zel'dovich effect, and Lyα data. For a cross-check, we compare our limits with that obtained through the cosmic microwave background faraday rotation effect and BBN. The limits range between 1.5 nG and 4.5 nG for nB ∈ (− 3; −1.5).

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).

If a primordial magnetic field in the universe has non-zero helicity, the violation of parity symmetry results in non-zero correlations between cosmic microwave background temperature and B-mode polarization. In this paper we derive approximations to the relevant microwave background power spectra arising from a helical magnetic field. Using the cross-power spectrum between temperature and B-mode polarization from the WMAP nine-year data, we set a 95\% confidence level upper limit on the helicity amplitude to be 10 nG$^2$ Gpc for helicity spectral index $n_H = -1.9$, for a cosmological magnetic field with effective field strength of 3 nG and a power-law index $n_B = -2.9$ near the scale-invariant value. Future microwave background polarization maps with greater sensitivity will be able to detect the helicity of an inflationary magnetic field well below the maximum value allowed by microwave background constraints on the magnetic field amplitude.

Using the CLEO detector at the Cornell Electron Storage Ring, we have made a measurement of $R\ensuremath{\equiv}\ensuremath{\sigma}{(e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons})/\ensuremath{\sigma}{(e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})=3.56\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.07$ at $\sqrt{s}$=10.52 GeV. This implies a value for the strong coupling constant of ${\ensuremath{\alpha}}_{s}(10.52 \mathrm{GeV})=0.20\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.06$, or ${\ensuremath{\alpha}}_{s}{(M}_{Z})=0.13\ifmmode\pm\else\textpm\fi{}0.005\ifmmode\pm\else\textpm\fi{}0.03$.

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

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 have searched for two-body charmless decays of B mesons to purely hadronic exclusive final states including $\omega$ or $\phi$ mesons using data collected with the CLEO II detector. With this sample of $6.6 \times 10^6$ B mesons we observe a signal for the $\omega K^+$ final state, and measure a branching fraction of B($B^+ \to \omega K^+$) = 1.5 +0.7 -0.6 +-0.2 $\times 10^{-5}$. We also observe some evidence for the $\phi K^*$ final state, and upper limits are given for 22 other decay modes. These results provide the opportunity for studies of theoretical models and physical parameters.

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.

We report the first observation of two narrow charmed strange baryons decaying to $\Xi_c^+\gamma$ and $\Xi_c^0\gamma$, respectively, using data from the CLEO II detector at CESR. We interpret the observed signals as the $\Xi_c^{+\prime}(c{su})$ and $\Xi_c^{0\prime}(c{sd})$, the symmetric partners of the well-established antisymmetric $\Xi_c^+(c[su])$ and $\Xi_c^0(c[sd])$. The mass differences $M(\Xi_c^{+\prime})-M(\Xi_c^+)$ and $M(\Xi_c^{0\prime})-M(\Xi_c^0)$ are measured to be $107.8\pm 1.7\pm 2.5$ and $107.0\pm 1.4\pm 2.5 MeV/c^2$, respectively.

We have searched for the effective FCNC decays b->s l+l- using an inclusive method. We set upper limits on the branching ratios B(b->s e+e-) < 5.7 10^{-5}, B(b->s mu+mu-) < 5.8 10^{-5}, and B(b->s e+-mu-+) < 2.2 10^{-5} (at 90 %\ C.L.). Combining the di-electron and di-muon decay modes we find: B(b->s l+l-) < 4.2 10^{-5} (at 90 % C.L.).

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.

We consider the generation of gravitational waves by primordial helical inverse cascade magnetohydrodynamic (MHD) turbulence produced by bubble collisions at the electroweak phase transition. We extend the previous study \cite{kgr08} by considering both currently discussed models of MHD turbulence. For popular electroweak phase transition parameter values, the generated gravitational wave spectrum is only weakly dependent on the MHD turbulence model. Compared to the unmagnetized electroweak phase transition case, the spectrum of MHD-turbulence-generated gravitational waves peaks at lower frequency with larger amplitude and can be detected by the proposed Laser Interferometer Space Antenna

A search for the lepton-family-number-violating decays →e␥ and →␥ has been performed using CLEO II data.No evidence of a signal has been found and the corresponding upper limits are B(→e␥)Ͻ2.7ϫ10Ϫ6 and B(→␥)Ͻ3.0ϫ10Ϫ6 at 90% C.L. ͓S0556-2821͑97͒50207-4͔

two typographical errors in Table I of our Letter: In the ninth row of Table I for the K 2 1430, the phase should read 335 not 155.In the eleventh row of Table I for the nonresonant, the phase should read 340 not 160.

Using data collected by the CLEO detector in the Upsilon(4S) region, we report new measurements of the exclusive decays of B mesons into final states of the type Lambda_c^+ p-bar n(pi), where n=0,1,2,3. We find signals in modes with one, two and three pions and an upper limit for the two body decay Lambda_c^+ pbar. We also make the first measurements of exclusive decays of B mesons to Sigma_c p-bar n(pi), where n=0,1,2. We find signals in modes with one and two pions and an upper limit for the two body decay Sigma_c p-bar. Measurements of these modes shed light on the mechanisms involved in B decays to baryons.

We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). Our report includes new computational tool developments, studies of the implications of the Higgs boson discovery on new physics, important signatures for searches for natural new physics at the LHC, new studies of flavour aspects of new physics, and assessments of the interplay between direct dark matter searches and the LHC.

The branching fractions for $\ensuremath{\tau}\ensuremath{\rightarrow}e\ensuremath{\nu}{\ensuremath{\nu}}_{\ensuremath{\tau}},$ $\ensuremath{\mu}\ensuremath{\nu}{\ensuremath{\nu}}_{\ensuremath{\tau}},$ and $h{\ensuremath{\nu}}_{\ensuremath{\tau}}$ are measured using data collected with the CLEO detector at the CESR ${e}^{+}{e}^{\ensuremath{-}}$ collider: ${\mathcal{B}}_{e}$=0.1776$\ifmmode\pm\else\textpm\fi{}$0.0006$\ifmmode\pm\else\textpm\fi{}$0.0017, ${\mathcal{B}}_{\ensuremath{\mu}}$=0.1737$\ifmmode\pm\else\textpm\fi{}$0.0008$\ifmmode\pm\else\textpm\fi{}$0.0018, and ${\mathcal{B}}_{h}$=0.1152$\ifmmode\pm\else\textpm\fi{}$0.0005$\ifmmode\pm\else\textpm\fi{}$0.0012, where the first error is statistical, the second systematic, and $h$ refers to either a charged $\ensuremath{\pi}$ or $K$. Also measured is the $\ensuremath{\tau}$ mass, ${m}_{\ensuremath{\tau}}$=(1778.2$\ifmmode\pm\else\textpm\fi{}$1.4) MeV. Lepton universality is affirmed by the relative branching fractions $({\mathcal{B}}_{\ensuremath{\mu}}$/${\mathcal{B}}_{e}$=0.9777$\ifmmode\pm\else\textpm\fi{}$0.0063$\ifmmode\pm\else\textpm\fi{}$0.0087, ${\mathcal{B}}_{h}$/${\mathcal{B}}_{e}$=0.6484$\ifmmode\pm\else\textpm\fi{}$0.0041$\ifmmode\pm\else\textpm\fi{}$0.0060) and the charged-current gauge coupling-constant ratios ${(g}_{\ensuremath{\mu}}{/g}_{e}$=1.0026$\ifmmode\pm\else\textpm\fi{}$0.0055, ${g}_{\ensuremath{\tau}}{/g}_{\ensuremath{\mu}}$=0.9990$\ifmmode\pm\else\textpm\fi{}$0.0098). The $\ensuremath{\tau}$ mass result may be recast as a $\ensuremath{\tau}$ neutrino mass limit, ${m}_{{\ensuremath{\nu}}_{\ensuremath{\tau}}}&lt;$60 MeV at 95% C.L.

We report new measurements of the differential and total branching ratios for inclusive B decay to D^0, D^+ and D^{*+} and the first measurement of the same quantities for inclusive B decay to $D^{*0}$. Here B is the mixture of B_d and B_u from $\Upsilon(4S)$ decay. Furthermore, since more than one charm particle (or antiparticle) of the same kind can be produced in B decay, here ``inclusive B branching ratio'' is used to mean the average number of charm particles and their antiparticles of a certain species produced in B decay. We obtain the following results (the first error is statistical, the second systematic of this analysis, the third is propagated from other measurements): ${\cal B}(B\to D^0 X) = (0.636\pm 0.014\pm 0.019\pm 0.018), {\cal B}(B\to D^+ X) = (0.235\pm 0.009\pm 0.009\pm 0.024), {\cal B}(B\to D^{*0} X) = (0.247\pm 0.012\pm 0.018\pm 0.018), {\cal B}(B\to D^{*+} X) = (0.239\pm 0.011\pm 0.014\pm 0.009)$. The following ratio of branching ratios is not affected by most of the systematic errors: ${\cal B}(B\to D^{*0} X)/{\cal B}(B\to D^{*+} X) = (1.03\pm 0.07\pm 0.09\pm 0.08).$ We also report the first measurement of the momentum-dependent $D^{*0}$ polarization and a new measurement of the $D^{*+}$ polarization in inclusive B decay. Using these measurements and other CLEO results and making some additional assumptions, we calculate the average number of c and $\bar c$ quarks produced in B decay to be $< n_c > = 1.10\pm 0.05$.

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 have observed new channels for τ decays with an η in the final state. We study 3-prong tau decays, using the η→γγ and η→3π0 decay modes and 1-prong decays with two π0's using the η→γγ channel. The measured branching fractions are B(τ−→π−π−π+ηντ)=(3.4−0.5+0.6±0.6)×10−4 and B(τ−→π−2π0ηντ)=(1.4±0.6±0.3)×10−4. We observe clear evidence for f1→ηππ substructure and measure B(τ−→f1π−ντ)=(5.8−1.3+1.4±1.8)×10−4. We have also searched for η′(958) production and obtain 90% C.L. upper limits B(τ−→π−η′ντ)<7.4×10−5 and B(τ−→π−π0η′ντ)<8.0×10−5.Received 25 June 1997DOI:https://doi.org/10.1103/PhysRevLett.79.2406©1997 American Physical Society

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).

Using data taken with the CLEO II detector at the Cornell Electron Storage Ring, we have determined the ratio of branching fractions: ${R}_{\ensuremath{\gamma}}\ensuremath{\equiv}\ensuremath{\Gamma}(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}\mathrm{gg})/\ensuremath{\Gamma}(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\mathrm{ggg})=[2.75\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.15(\mathrm{syst})]%$. From this ratio, we have determined the QCD scale parameter ${\ensuremath{\Lambda}}_{\overline{\mathrm{MS}}}$ (defined in the modified minimal subtraction scheme) to be ${\ensuremath{\Lambda}}_{\overline{\mathrm{MS}}}=233\ifmmode\pm\else\textpm\fi{}11\ifmmode\pm\else\textpm\fi{}59$ MeV, from which we determine a value for the strong coupling constant ${\ensuremath{\alpha}}_{s}{(M}_{\ensuremath{\Upsilon}(1S)})=0.163\ifmmode\pm\else\textpm\fi{}0.002\ifmmode\pm\else\textpm\fi{}0.014$, or ${\ensuremath{\alpha}}_{s}{(M}_{Z})=0.110\ifmmode\pm\else\textpm\fi{}0.001\ifmmode\pm\else\textpm\fi{}0.007$.

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 have searched for the two-body decay of the B meson to a light pseudoscalar meson h = pi(+/-),K+/-,K(0)(S) and a massless neutral feebly interacting particle X(0) such as the familon, the Nambu-Goldstone boson associated with a spontaneously broken global family symmetry. We find no significant signal by analyzing a data sample containing 9.7x10(6) BBbar mesons collected with the CLEO detector at the Cornell Electron Storage Ring, and set 90% C.L. upper limits italicB(B(+/-) --> h(+/-)X(0)) = 4.9x10(-5) and italicB(B(0) --> K(0)(S)X(0)) = 5.3x10(-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.

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 13.8 fb(-1) of data collected at or just below the Upsilon(4S) with the CLEO detector, we report the result of a search for the flavor changing neutral current process D0-->gammagamma. We observe no significant signal for this decay mode and determine 90% confidence level upper limits on the branching fractions B(D0-->gammagamma)/B(D0-->pi(0)pi(0))<0.033 and B(D0-->gammagamma)<2.9 x 10(-5).

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.

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we determine the ratio R(chrg) for the mean charged multiplicity observed in Upsilon(1S)->gggamma events, to the mean charged multiplicity observed in e+e- -> qqbar gamma events. We find R(chrg)=1.04+/-0.02+/-0.05 for jet-jet masses less than 7 GeV.

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 a sample of 4.7 ${\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity accumulated with the CLEO-II detector at the Cornell Electron Storage Ring (CESR), we have measured the ratios of the branching fractions $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{h}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})/\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{h}^{+}{h}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(5.16\ifmmode\pm\else\textpm\fi{}0.20\ifmmode\pm\else\textpm\fi{}0.50)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2},$ $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{h}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})/\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{h}^{+}{h}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(2.54\ifmmode\pm\else\textpm\fi{}0.44\ifmmode\pm\else\textpm\fi{}0.39)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2},$ $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})/\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{h}^{+}{h}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(1.52\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.29)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, and the upper limit $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})/\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{h}^{+}{h}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})&lt;0.0154$ at 95% C.L. Coupled with additional experimental information, we use our results to extract information on the structure of three-prong tau decays to charged kaons.

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.

The decay τ−→K*−ηντ has been observed with the CLEO II detector. The K*− is reconstructed in two decay channels, K*−→KSπ−→π−π+π− and K*−→K−π0. The η is reconstructed from the decay η→γγ. The measured branching fraction is B(τ−→K*−ηντ)=(2.9±0.8±0.4)×10−4. We also measure the inclusive branching fractions without requiring the K* resonance, B(τ−→KSπ−ηντ)=(1.10±0.35±0.11)×10−4 and B(τ−→K−π0ηντ)=(1.77±0.56±0.71)×10−4. The results indicate that the K*− resonance dominates the KSπ− mass spectrum.Received 15 September 1998DOI:https://doi.org/10.1103/PhysRevLett.82.281©1999 American Physical Society

The CLEO experiment at the CESR collider has used 13.7fb−1 of data to search for the production of the Ω0c (css ground state) in e+e− collisions at √s≃10.6GeV. The modes used to study the Ω0c are Ω−π+, Ω−π+π0, Ξ−K−π+π+, Ξ0K−π+, and Ω−π+π+π−. We observe a signal of 40.4±9.0(stat) events at a mass of 2694.6±2.6(stat)±1.9(syst)MeV/c2, for all modes combined.Received 11 October 2000DOI:https://doi.org/10.1103/PhysRevLett.86.3730©2001 American Physical Society

We report the results of a search for the rare baryonic decay modes B -> Lambda Lambdabar, B -> Lambdabar p, B -> Lambdabar p pi, and B -> p pbar using 5.8M BBbar pairs collected with the CLEO detector. We see no statistically significant signals in any of these modes and set 90% confidence level upper limits on their branching fractions, B(B -> Lambda Lambdabar) < 3.9 \times 10^{-6}, B(B -> Lambdabar p) < 2.6 \times 10^{-6}, B(B -> Lambdabar p pi) < 1.3 \times 10^{-5}, and B(B -> p pbar) < 7.0 \times 10^{-6}.

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.

We report on a search for a supersymmetric $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{B}$ meson with mass between 3.5 and $4.5\mathrm{GeV}{/c}^{2}$ using $4.52{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity produced at $\sqrt{s}=10.52\mathrm{GeV},$ just below the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}B\overline{B}$ threshold, and collected with the CLEO detector. We find no evidence for a light scalar bottom quark.

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.

We use data collected by the CLEO II detector at the Cornell Electron Storage Ring (CESR) to search for ${B}^{+}\ensuremath{\rightarrow}{h}^{+}{h}^{\ensuremath{-}}{h}^{+}$ (nonresonant) decays, where ${h}^{\ifmmode\pm\else\textpm\fi{}}$ can be either ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{,K}^{\ifmmode\pm\else\textpm\fi{}}$, or $p(\overline{p})$. We see no evidence for signals and set upper limits on the branching fractions in the range $(2.8--8.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. If observed, these decays may display CP violating asymmetries.

The CLEOII detector at the Cornell e+ e- storage ring CESR has been used to search for the two-photon production of the $f_J(2220)$ decaying into pi+ pi-. No evidence for a signal is found in data corresponding to an integrated luminosity of 4.77/fb and a 95% CL upper limit on $\Gamma_{two-photon} * BR{pi+ pi-}$ of 2.5 eV is set. If this result is combined with the BES Collaboration's measurement of $f_J(2220) -> pi+ pi-$ in radiative $J/\psi$ decay, a 95% CL lower limit on the stickiness of the $f_J(2220)$ of 73 is obtained. If the recent CLEO result for $\Gamma_{two-photon} * BR{\K_S K_S}$ is combined with the present result, the stickiness of the $f_J(2220)$ is found to be larger than 102 at the 95% CL. These results for the stickiness (the ratio of the probabilities for two-gluon coupling and two-photon coupling) provide further support for a substantial neutral parton content in the $f_J(2220)$.

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we present new measurements of the branching fractions for ${D}^{+}\ensuremath{\rightarrow}{K}_{S}{K}^{+}$ and ${D}^{+}\ensuremath{\rightarrow}{K}_{S}{\ensuremath{\pi}}^{+}$. These results are combined with other CLEO measurements to extract the ratios of isospin amplitudes and phase shifts for $D\ensuremath{\rightarrow}\mathrm{KK}$ and $D\ensuremath{\rightarrow}K\ensuremath{\pi}$.

Using $3.1{\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ of data accumulated at the $\ensuremath{\Upsilon}(4S)$ by the CLEO-II detector, corresponding to $3.3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs, we have searched for the color-suppressed $B$ hadronic decay processes ${B}^{0}\ensuremath{\rightarrow}{D}^{0}{(D}^{*0}){\mathrm{X}}^{0},$ where ${\mathrm{X}}^{0}$ is a light neutral meson ${\ensuremath{\pi}}^{0},$ ${\ensuremath{\rho}}^{0},$ \ensuremath{\eta}, ${\ensuremath{\eta}}^{\ensuremath{'}}$ or \ensuremath{\omega}. The ${D}^{*0}$ mesons are reconstructed in ${D}^{*0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0}$ and the ${D}^{0}$ mesons in ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+},$ ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ and ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decay modes. No obvious signal is observed. We set 90% C.L. upper limits on these modes, varying from $1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ for ${B}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0}$ to $1.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for ${B}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\eta}}^{\ensuremath{'}}.$

We report on a study of exclusive radiative decays of the $\ensuremath{\Upsilon}(1S)$ resonance collected with the CLEO II detector operating at the Cornell Electron Storage Ring. We present the first observation of the radiative decays $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$. For the dipion mass regime ${m}_{\ensuremath{\pi}\ensuremath{\pi}}&gt;1.0\phantom{\rule{0ex}{0ex}}\mathrm{GeV}$, we obtain $B(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(6.3\ifmmode\pm\else\textpm\fi{}1.2\ifmmode\pm\else\textpm\fi{}1.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $B(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(1.7\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$.

Using the CLEO detector at the Cornell e ϩ e Ϫ storage ring CESR we study the two-photon production of ⌳⌳ ¯, making the first observation of ␥␥→⌳⌳ ¯.We present the cross section for ␥␥→⌳⌳ ¯as a function of the ␥␥ center of mass energy and compare it to that predicted by the quark-diquark model.͓S0556-2821͑97͒50217-7͔

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.

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 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.

An overview of the system architecture and algorithms used for the DO Central Track Trigger (CTT) in the Run 2 of the Fermilab Tevatron Proton-Antiproton Collider is presented. This system uses information from the newly commissioned Central Fiber Tracker and Preshower Detectors to generate Level 1 trigger decisions. It also generates lists of seed tracks and preshower clusters that are sent to the Level 1 Muon Trigger, L2 Silicon Track Trigger, and Central and Forward Preshower Level 2 preprocessors. The system consists of modular boards which utilize field-programmable gate arrays (FPGAs) to implement trigger algorithms. The system delivers trigger decisions every 132 ns, based on input data flowing at a maximum sustained rate of 475 gigabits per second. The first results of trigger efficiency studies are presented.

We present a collection of signatures for physics beyond the standard model that need to be explored at the LHC. First, are presented various tools developed to measure new particle masses in scenarios where all decays include an unobservable particle. Second, various aspects of supersymmetric models are discussed. Third, some signatures of models of strong electroweak symmetry are discussed. In the fourth part, a special attention is devoted to high mass resonances, as the ones appearing in models with warped extra dimensions. Finally, prospects for models with a hidden sector/valley are presented. Our report, which includes brief experimental and theoretical reviews as well as original results, summarizes the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 8-26 June, 2009).

The MIP Timing Detector will provide additional timing capabilities for detection of minimum ionizing particles (MIPs) at CMS during the High Luminosity LHC era, improving event reconstruction and pileup rejection. The central portion of the detector, the Barrel Timing Layer (BTL), will be instrumented with LYSO:Ce crystals and Silicon Photomultipliers (SiPMs) providing a time resolution of about 30 ps at the beginning of operation, and degrading to 50-60 ps at the end of the detector lifetime as a result of radiation damage. In this work, we present the results obtained using a 120 GeV proton beam at the Fermilab Test Beam Facility to measure the time resolution of unirradiated sensors. A proof-of-concept of the sensor layout proposed for the barrel region of the MTD, consisting of elongated crystal bars with dimensions of about 3 x 3 x 57 mm$^3$ and with double-ended SiPM readout, is demonstrated. This design provides a robust time measurement independent of the impact point of the MIP along the crystal bar. We tested LYSO:Ce bars of different thickness (2, 3, 4 mm) with a geometry close to the reference design and coupled to SiPMs manufactured by Hamamatsu and Fondazione Bruno Kessler. The various aspects influencing the timing performance such as the crystal thickness, properties of the SiPMs (e.g. photon detection efficiency), and impact angle of the MIP are studied. A time resolution of about 28 ps is measured for MIPs crossing a 3 mm thick crystal bar, corresponding to an MPV energy deposition of 2.6 MeV, and of 22 ps for the 4.2 MeV MPV energy deposition expected in the BTL, matching the detector performance target for unirradiated devices.

A limit on the mass of the tau neutrino is derived from 4.5 million tau pairs produced in an integrated luminosity of 5.0 fb^{-1} of electron-positron annihilation to tau pairs at center of mass energies near 10.6 GeV. The measurement technique involves a two-dimensional extended likelihood analysis, including the dependence of the end-point population on the neutrino mass, and allows for the first time an explicit background contribution. We use the decays of the tau to five charged pions and a neutrino as well as the decay to three charged pions, two neutral pions and a neutrino to obtain an upper limit of 30 MeV/c^2 at 95% C.L.

Using a data sample with integrated luminosity of about 3.9 fb^{-1} collected in e+ e- annihilation with the CLEO-II detector at the Cornell Electron Storage Ring, we have measured the branching ratios for the decay modes Ds -> (eta, eta') pi and Ds -> (eta, eta') rho relative to Ds -> phi pi. These decay modes are among the most common hadronic decays of the Ds's and can be related by factorization to the semileptonic decays Ds -> (eta,eta') l nu. The results obtained are compared with previous CLEO results and with the branching ratios measured for the related semileptonic decays. We also report results on the Cabibbo-suppressed decays of the D+ to the same final states.

Using the CLEO II detector we have performed the first search for $CP$ violation in tau lepton decay. CP violation in lepton decay does not occur in the minimal standard model but can occur in extensions such as the multi-Higgs doublet model. It appears as a characteristic difference between the $\tau^+$ and $\tau^-$ decay angular distributions for the semi-leptonic decay modes such as $\tau^- \to K^0 \pi^- \nu$. We define an observable asymmetry to exploit this and find no evidence for any CP violation.

Using a sample of $9.7\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ meson pairs collected with the CLEO detector, we study B decays to the ${\ensuremath{\chi}}_{c1}$ and ${\ensuremath{\chi}}_{c2}$ charmonia states, which are reconstructed via their radiative decays to $J/\ensuremath{\psi}.$ We first measure the branching fraction for inclusive ${\ensuremath{\chi}}_{c1}$ production in B decays to be $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c1}X)=(4.14\ifmmode\pm\else\textpm\fi{}0.31\ifmmode\pm\else\textpm\fi{}0.40)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3},$ where the first uncertainty is statistical and the second one is systematic. We derive the branching fractions for direct ${\ensuremath{\chi}}_{c1}$ and ${\ensuremath{\chi}}_{c2}$ production in B decays by subtracting the known contribution of the decay chain $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\psi}(2S)X$ with $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1,2}\ensuremath{\gamma}.$ We obtain $\mathcal{B}[\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c1}(\mathrm{direct})X]=(3.83\ifmmode\pm\else\textpm\fi{}0.31\ifmmode\pm\else\textpm\fi{}0.40)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}.$ No statistically significant signal for ${\ensuremath{\chi}}_{c2}$ production is observed in either case. Using the Feldman-Cousins approach, we determine the 95% confidence intervals to be $[0.2,2.0]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c2}X),$ $[0.0,1.7]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for $\mathcal{B}[\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c2}(\mathrm{direct})X],$ and [0.00,0.44] for the ratio $\ensuremath{\Gamma}[\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c2}(\mathrm{direct})X]/\ensuremath{\Gamma}[\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c1}(\mathrm{direct})X].$ We also measure the branching ratio $\ensuremath{\Gamma}[\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c2}(\mathrm{direct}{)X}_{s}]/\ensuremath{\Gamma}[\stackrel{\ensuremath{\rightarrow}}{B}{\ensuremath{\chi}}_{c1}(\mathrm{direct}{)X}_{s}]$ for different ${X}_{s}$ configurations by reconstructing B decays into exclusive final states with $J/\ensuremath{\psi},$ \ensuremath{\gamma}, a kaon, and up to four pions. For all the ${X}_{s}$ configurations, we observe a strong ${\ensuremath{\chi}}_{c1}$ signal yet no statistically significant ${\ensuremath{\chi}}_{c2}$ signal. We discuss how our results compare with theoretical predictions in different models of charmonium production.

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 search for the ``wrong-sign'' decay D0 -> K+ pi- pi+ pi- using 9 fb-1 of e+e- collisions on and just below the Upsilon(4S) resonance. This decay can occur either through a doubly Cabibbo-suppressed process or through mixing to a D0bar followed by a Cabibbo-favored process. Our result for the time-integrated wrong-sign rate relative to the decay D0 -> K- pi+ pi- pi+ is (0.0041 +0.0012-0.0011(stat.) +-0.0004(syst.))x(1.07 +-0.10)(phase space), which has a statistical significance of 3.9 standard deviations.

We have searched for the rare decay of the $\ensuremath{\eta}$ meson $\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ using the CLEO II detector. The $\ensuremath{\eta}$'s were produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions with 10 GeV center-of-mass energy at the Cornell Electron Storage Ring (CESR). We find with $90%$ confidence the upper limit on the branching fraction $B(\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})&lt;7.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. The application of conventional elementary particle theory to this decay predicts a branching fraction of about ${10}^{\ensuremath{-}9}$.

We have measured the spectral shape Michel parameters $\ensuremath{\rho}$ and $\ensuremath{\eta}$ using leptonic decays of the $\ensuremath{\tau}$, recorded by the CLEO II detector. Assuming $e\ensuremath{-}\ensuremath{\mu}$ universality in the vectorlike couplings, we find ${\ensuremath{\rho}}_{e\ensuremath{\mu}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.735\ifmmode\pm\else\textpm\fi{}0.013\ifmmode\pm\else\textpm\fi{}0.008$ and ${\ensuremath{\eta}}_{e\ensuremath{\mu}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}0.015\ifmmode\pm\else\textpm\fi{}0.061\ifmmode\pm\else\textpm\fi{}0.062$, where the first error is statistical and the second systematic. We also present measurements for the parameters for $e$ and $\ensuremath{\mu}$ final states separately.

Using a data sample collected with the CLEO II detector at CESR, we have searched for dipion transitions between pairs of $\Upsilon$ resonances at energies near the $\Upsilon(4S)$. We obtain upper limits $B(\Upsilon(4S)\to \Upsilon(2S)\pi^+\pi^-) < 3.9 \times 10^{-4}$ and $B(\Upsilon(4S)\to \Upsilon(1S)\pi^+\pi^-) < 1.2 \times 10^{-4}$. We also observe the transitions $\Upsilon(3S)\to \Upsilon(1S)$, $\Upsilon(3S)\to \Upsilon(2S)$, and $\Upsilon(2S)\to \Upsilon(1S)$, from which we measure the cross-sections for the radiative processes $e^+e^- \to \Upsilon(3S)\gamma$ and $e^+e^- \to \Upsilon(2S)\gamma$.

A measurement of the spin alignment of charged D^* mesons produced in continuum e^+ e^- \to c \bar{c} events at \sqrt{s}=10.5 GeV is presented. This study using 4.72 fb^{-1} of CLEO II data shows that there is little evidence of any D^* spin alignment.

We present new measurements of photon energies and branching fractions for the radiative transitions Υ(2S)→γχb(J=0,1,2)(1P). The masses of the χb states are determined from the measured radiative photon energies. The ratio of mass splittings between the χb substates, r≡(MJ=2−MJ=1)/(MJ=1−MJ=0), with M the χb mass, provides information on the nature of the b¯b confining potential. We find r(1P)=0.542±0.022±0.024. This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that r(1P)<r(2P); i.e., that this mass splitting ratio is smaller for the χb(1P) states than for the χb(2P) states.Received 12 March 1998DOI:https://doi.org/10.1103/PhysRevD.59.032003©1999 American Physical Society

The decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}2{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}3{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ has been studied with the CLEO II detector at the Cornell Electron Storage Ring. The branching fraction is measured to be $(2.85\ifmmode\pm\else\textpm\fi{}0.56\ifmmode\pm\else\textpm\fi{}0.51)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The result is in good agreement with the isospin expectation but somewhat below the conserved-vector-current prediction. We have searched for resonance substructure in the decay. Within the statistical precision, the decay is saturated by the channels ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}2{\ensuremath{\pi}}^{0}\ensuremath{\omega}{\ensuremath{\nu}}_{\ensuremath{\tau}}$, $2{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}}$, and ${\ensuremath{\pi}}^{\ensuremath{-}}2{\ensuremath{\pi}}^{0}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}}$. This is the first observation of this \ensuremath{\omega} decay mode and the branching fraction is measured to be $({1.89}_{\ensuremath{-}0.67}^{+0.74}\ifmmode\pm\else\textpm\fi{}0.40)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$.

Color-suppressed decays of B mesons to final states with $\ensuremath{\psi}(2S)$ mesons have been observed with the CLEO detector. The branching fractions for the decays ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\psi}{(2S)K}^{+},$ ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\psi}{(2S)K}^{*}{(892)}^{+},$ ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\psi}{(2S)K}^{0},$ and ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\psi}{(2S)K}^{*}{(892)}^{0}$ are measured to be $(7.8\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $(9.2\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}1.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $(5.0\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ and $(7.6\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ respectively, where the first uncertainty is statistical and the second is systematic. The first measurement of the longitudinal polarization fraction is extracted from the angular analysis of the $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\psi}{(2S)K}^{*}(892)$ candidates: ${\ensuremath{\Gamma}}_{L}/\ensuremath{\Gamma}=0.45\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.04.$ Our measurements of the decays ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\psi}{(2S)K}^{0}$ and ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\psi}{(2S)K}^{*}{(892)}^{+}$ are first observations.

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 have searched for the decay of the lepton into seven charged particles and zero or one 0 .The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring ͑CESR͒ and correspond to an integrated luminosity of 4.61 fb Ϫ1 .No evidence for a signal is found.Assuming all the charged particles are pions, we set an upper limit on the branching fraction B" Ϫ →4 Ϫ 3 ϩ ( 0 ) …Ͻ2.4ϫ10 Ϫ6 at the 90% confidence level.This limit represents a significant improvement over the previous limit.͓S0556-2821͑97͒50221-9͔

We have searched for the decays $B\ensuremath{\rightarrow}\ensuremath{\mu}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\gamma}$ and $B\ensuremath{\rightarrow}e{\overline{\ensuremath{\nu}}}_{e}\ensuremath{\gamma}$ in a sample of $2.7\ifmmode\times\else\texttimes\fi{}{10}^{6}$ charged $B$ decays collected with the CLEO II detector. In the muon channel, we observe no candidates in the signal region and set an upper limit on the branching fraction of $\mathcal{B}(B\ensuremath{\rightarrow}\ensuremath{\mu}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\gamma})&lt;5.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at the 90% confidence level. In the electron channel, we observe five candidates in the signal region and set an upper limit on the branching fraction of $\mathcal{B}(B\ensuremath{\rightarrow}e{\overline{\ensuremath{\nu}}}_{e}\ensuremath{\gamma})&lt;2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at the 90% confidence level.

We have searched for the decay $\stackrel{\ensuremath{\rightarrow}}{B}{D}_{s1}^{+}(2536)X$ and measured an upper limit for the inclusive branching fraction of $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{B}{D}_{s1}^{+}X)&lt;0.96%$ at the 90% confidence level. This limit is small compared with the total expected $\stackrel{\ensuremath{\rightarrow}}{B}{D}^{(*)}{D}^{(*)}\mathrm{KX}$ rate. Assuming factorization, the ${D}_{s1}^{+}$ decay constant is constrained to be ${f}_{{D}_{s1}^{+}}$114 MeV at the 90% confidence level, at least 2.5 times smaller than that of ${D}_{s}^{+}$.

We have searched for lepton flavor violating decays of the tau lepton with one or two KS0 mesons in the final state. The data used in the search were collected with the CLEO II and II.V detectors at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 13.9 fb^-1 at the Upsilon(4S) resonance. No evidence for signals were found, therefore we have set 90% confidence level (C.L.) upper limits on the branching fractions B(tau -> e KS0) < 9.1e-7, B(tau -> mu KS0) < 9.5e-7, B(tau -> e 2KS0) < 2.2e-6, and B(tau -> mu 2KS0) < 3.4e-6. These represent significantly improved upper limits on the two-body decays and first upper limits on the three-body decays.

We report on a search for the radiative decay Upsilon(1S)-->gammaeta(') in 61.3 pb(-1) of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Three decay chains were investigated, all involving eta(')-->pi(+)pi(-)eta, followed by eta-->gammagamma, eta-->pi(0)pi(0)pi(0), or eta-->pi(+)pi(-)pi(0). We find no candidate events in any of the three cases and set a combined upper limit of 1.6x10(-5) at 90% C.L., significantly smaller than the previous limit. We compare our result to other radiative Upsilon decays, to radiative J/psi decays, and to theoretical predictions.

We present a collection of signatures for physics beyond the standard model that need to be explored at the LHC. First, are presented various tools developed to measure new particle masses in scenarios where all decays include an unobservable particle. Second, various aspects of supersymmetric models are discussed. Third, some signatures of models of strong electroweak symmetry are discussed. In the fourth part, a special attention is devoted to high mass resonances, as the ones appearing in models with warped extra dimensions. Finally, prospects for models with a hidden sector/valley are presented. Our report, which includes brief experimental and theoretical reviews as well as original results, summarizes the activities of the 'New Physics' working group for the 'Physics at TeV Colliders' workshop (Les Houches, France, 8-26 June, 2009).

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(+)).