Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session Q10: Rare B Decays |
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Sponsoring Units: DPF Chair: Brendan Casey, Brown University Room: Hyatt Regency Dallas Cumberland C |
Monday, April 24, 2006 1:30PM - 1:42PM |
Q10.00001: Search for the radiative leptonic decay $B \rightarrow \gamma \ell\bar{\nu_{\ell}}$ Gregory Dubois-Felsmann We present the results of a search for charged $B$ meson decays into $\gamma \ell \bar{\nu_{\ell}}$, where $\ell = e, \mu$. We use a sample of approximately 232 million $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance by the BaBar detector at the PEP-II asymmetric-energy $B$~Factory at SLAC. This decay mode is related to the theoretically clean purely leptonic decay, but with a larger branching fraction due to the lack of helicity supression. An observation of this decay could be used either to evaluate the $B$ meson pseudoscalar decay constant $f_B$ or, with an independent determination of $f_B$, to test theoretical models of charmless $B$ decays. [Preview Abstract] |
Monday, April 24, 2006 1:42PM - 1:54PM |
Q10.00002: Measurement of exclusive $B\rightarrow X_u l\nu$ branching fractions using semileptonic tags Shenjian Chen Using 210 fb$^{-1}$ of $\Upsilon(4S)$ data collected with the BABAR detector at the PEP-II storage ring, we report the result of a measurement of branching fractions of exclusive $B\to X_u\ell\nu$ decays. The accompanying $B$ mesons are tagged with semileptonic $B\to D^{(*)}\ell\nu$ decays. [Preview Abstract] |
Monday, April 24, 2006 1:54PM - 2:06PM |
Q10.00003: Search for $B^0\rightarrow K^{*0}K_{\rm S}^0$ decay at BaBar Stephen Foulkes We present the result of a search for rare decays of $B$ mesons into $K^{*0}K_{\rm S}^0$ where $K^{*0}\rightarrow K^+\pi^-$ and $K_ {\rm S}^0\rightarrow \pi^+\pi^-$. We use a sample of approximately 227 million B-meson pairs recorded at the $\Upsilon(4S)$ resonance by the BaBar detector at the PeP-II $B$ Factory at SLAC. This decay mode provides input to theoretical studies of rare $B$ decays using flavor- symmetry or factorization methods. [Preview Abstract] |
Monday, April 24, 2006 2:06PM - 2:18PM |
Q10.00004: Search for the rare decays $B\rightarrow \rho\gamma$ and $B^0\rightarrow\omega\gamma$ Karsten Koeneke Rare $B$ decays that follow a $b\to d\gamma$ transition are sensitive to the ratio $|V_{td}/V_{ts}|$ and are a promising probe for new physics. Decays of this type are most easily accessible through the rare decays $B\to\rho\gamma$ and $B^0\to\omega\gamma$. We present preliminary results of a search for these decays in a sample of approximately 300 million $B\bar{B}$ pairs collected with the BaBar detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. [Preview Abstract] |
Monday, April 24, 2006 2:18PM - 2:30PM |
Q10.00005: Search for rare flavor-changing and electroweak penguin decays of the $B^0_s$ meson Ralf Bernhard Using 1 fb$^{-1}$ of data collected with the D\O\ detector in Run II of the Tevatron, limits are presented for searches for the rare flavor changing neutral current decay $B^0_s \rightarrow \mu^+ \mu^-$, as well as $B^0_s \rightarrow \mu^+ \mu^- \phi$. The former decay mode is particularly sensitive to supersymmetric extensions of the Standard Model. For the latter mode, a measurement of the branching ratio could validate the prediction of the Standard Model. [Preview Abstract] |
Monday, April 24, 2006 2:30PM - 2:42PM |
Q10.00006: Lepton-flavour violating decays, $\tau\rightarrow l\pi^0/\eta/\eta^{\prime}$ Sanjay Swain Searches for lepton-flavor violating decays of $\tau$ leptons will be presented, with emphasis on channels $lM^{0}$ where $l$ is an electron or muon and $M^{0}$ is a $\pi^{0}$, $\eta$ or $\eta{'}$ meson. The analyses use data collected in $e^{+}e^{-}$ collisions at a centre-of-mass energy of 10.58~GeV with the BABAR detector at the PEP-II storage rings. [Preview Abstract] |
Monday, April 24, 2006 2:42PM - 2:54PM |
Q10.00007: Search for Lepton Flavor Violation in $\Upsilon$ Decays William Love Using the data collected with the CLEO III detector at CESR we report on the first search for Lepton Flavor Violation in the decays of the $\Upsilon (1S)$, $\Upsilon (2S)$, and $\Upsilon(3S)$ resonances. After describing the various components of our unbinned maximum-likelihood fit, we present fits to background data, signal Monte Carlo, and signal data. The discovery of LFV in $\Upsilon$~decays could be explained by low-mass quantum gravity, Abdus-Salam leptoquarks, or neutrino oscillations arising in SUSY models. [Preview Abstract] |
Monday, April 24, 2006 2:54PM - 3:06PM |
Q10.00008: Hadronic spectrum of the $\tau^-\rightarrow \pi^-\pi^0\nu$ decay Rahmat Rahmat We describe a study of the invariant mass spectrum of the hadronic system in the $\tau^- \to \pi^-\pi^0\nu$ decay, using the BaBar detector at SLAC. We describe how the $\pi^-\pi^0$ spectral function inferred from the invariant mass spectrum can be used as a test of the Conserved Vector Current hypothesis. We also discuss the implications of our study in estimating the hadronic contribution to the muon anomalous magnetic moment. [Preview Abstract] |
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