Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session R8: Charm and B Physics I |
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Sponsoring Units: DPF Chair: Mikhail Shifman, University of Minnesota Room: Grand F |
Monday, May 2, 2011 1:30PM - 1:42PM |
R8.00001: ABSTRACT WITHDRAWN |
Monday, May 2, 2011 1:42PM - 1:54PM |
R8.00002: Measurement of Upsilon Polarization at CDF James Thome The production polarization for Upsilon(1S), (2S), and (3S) mesons has been measured in dimuon events from p-pbar collisions at 1.96 TeV, using the CDF detector at the Tevatron. The measurement is conducted over a pT range of 2-40 GeV/c using data corresponding to an integrated luminosity of 4.8 fb-1. [Preview Abstract] |
Monday, May 2, 2011 1:54PM - 2:06PM |
R8.00003: Improved measurements of decays mediated by the $b\to s\ell\ell$ transition at CDF Hideki Miyake The CDF collaboration presents updated measurements of branching fractions, polarization, and muon forward-backward asymmetry ($A_{\rm FB}$) in $B\to K^{(*)} \mu\mu$ decays, which are sensitive probes of new physics. The measurements are based on a data set of $\rm 6.7fb^{-1}$. Results of a $\Lambda_b^0 \to \Lambda\mu\mu$ search and an updated measurement of $B_s^0 \to \phi \mu \mu$ branching fraction are also reported. [Preview Abstract] |
Monday, May 2, 2011 2:06PM - 2:18PM |
R8.00004: Measurement of charmless two body decays of B hadrons ar CDF Fabrizio Ruffini The CDF collaboration has previously observed several decay modes of B$^0$ , B$^0_s$ , and $\Lambda^0_b$ hadrons into charmless two-body final states, using a sample of 1fb$^{-1}$ of integrated luminosity collected with an impact parameter trigger, and measured their branching ratios and CP-violating asymmetries. We present improved results based on a substantially larger data sample of 6 fb-1. [Preview Abstract] |
Monday, May 2, 2011 2:18PM - 2:30PM |
R8.00005: Precision measurement of the natural line width of the $D^{*+}$ at {\sc BaBar} Zachary Huard We measure the total width of the $D^*(2010)^+$ in the transition $D^{*+}\rightarrow D^0 \pi^+$, where the $D^0$ is reconstructed in the decay modes $D^0 \rightarrow K^-\pi^+$, $D^0 \rightarrow K^-\pi^+\pi^0$, $D^0 \rightarrow K_{S}^{0}\pi^-\pi^+$, and $D^0 \rightarrow K^-\pi^+\pi^-\pi^+$. Our data sample corresponds to an integrated luminosity of 487 fb$^{-1}$, more than 50 times greater than for the current best measurment of the $D^{*+}$ width. The data were recorded at center-of-mass energies $10.58$ and $10.54$ GeV with the {\sc BaBar} detector at the PEP II asymmetric energy $e^+e^-$ collider. We use simulated events to model the resolution in $\Delta m$, the difference between the reconstructed invariant masses of the $D^{*+}$ and $D^0$ candidates. We obtain the $D^{*+}$ width by fitting the measured $\Delta m$ distribution to a Breit-Wigner lineshape convolved with the resolution function. [Preview Abstract] |
Monday, May 2, 2011 2:30PM - 2:42PM |
R8.00006: Measurement of $CP$-violating asymmetries in $B^0 \rightarrow (\rho \pi)^0$ using a time-dependent Dalitz-plot analysis of the {\sc BaBar} Tomonari Miyashita A measurement of $CP$-violating asymmetries is performed in the mode $B^0 \rightarrow \pi^+ \pi^- \pi^0$ where the decay mode is dominated by intermediate $\rho \rightarrow \pi \pi$ resonances. The use of a full time-dependent Dalitz plot analysis allows sensitivity to the interference effects caused by the relative strong and weak phases in the regions where the $\rho^+$, $\rho^-$, and $\rho^0$ resonances overlap. This feature of the analysis makes possible the unambiguous extraction of the strong and weak phases as well as the $CP$-violating parameter $\alpha \equiv {\rm arg}[-V_{\rm td}V^{*}_{\rm tb}/V_{\rm ud}V^{*}_{\rm ub}]$ (where the $V_{q q^\prime}$ are components of the CKM quark mixing matrix). A precision measurement of $\alpha$ serves to further test the Standard Model and constrain new physics. The analysis is performed using a sample of 431 ${\rm fb}^{-1}$ of data corresponding to $471 \times 10^6$ $B{\overline B}$ meson pairs collected at the $\Upsilon(4S)$ resonances by the {\sc BaBar} experiment using the PEP-II asymmetric-energy $e^+e^-$ collider at the SLAC National Accelerator Laboratory. [Preview Abstract] |
Monday, May 2, 2011 2:42PM - 2:54PM |
R8.00007: Measurement of the $B_s$ semileptonic branching ratio with {\sc BaBar} data above the $\Upsilon(4S)$ Brian Hamilton We report a measurement of the semileptonic branching ratio of the $B_s$ meson determined using a dataset collected with the {\sc BaBar} detector at the PEP-II asymmetric electron-positron collider in the center-of-mass energy region above the $\Upsilon(4S)$ resonance. [Preview Abstract] |
Monday, May 2, 2011 2:54PM - 3:06PM |
R8.00008: Search for baryon- and lepton-number violation in $B$ decays using the {\sc BaBar} dataset Matthew Bellis A search for the decay of a $B$ meson into a baryon and a lepton is performed, where the baryon is either a $\Lambda_c^+$ or a $\Lambda$, and the lepton is a muon or an electron. These decays violate both baryon and lepton number. This is the first search for these processes, and observation of a signal would indicate physics beyond the standard model. The search uses $(471\pm 1)\times 10^{6}$ $B\bar{B}$ pairs produced by the PEP-II $e^+e^-$ storage ring and collected by the {\sc BaBar} detector at the SLAC National Accelerator Laboratory. The search is performed using a blind analysis. No significant signal is observed in any of the decay modes, and upper limits are set on the various branching fractions at the 90\% confidence level. [Preview Abstract] |
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