Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session B11: B Physics I |
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Sponsoring Units: DPF Chair: Rick van Kooten, Indiana University Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis B |
Saturday, April 12, 2008 10:45AM - 10:57AM |
B11.00001: $B_s$ Oscillation Frequency Results from D0 Meghan Anzelc We report results on the measurement of the $B_s$ oscillation frequency using a large data set of over 2fb$^{-1}$ of integrated luminosity taken at the D0 experiment during RunIIa and RunIIb at the Tevatron. We search for oscillations in the time dependence of flavor-specific $B_s$ decays where the flavor of the $B_s$ at production is determined by studying inclusive properties of the event, using information from both the ``same-side'' and ``opposite-side'' of the $B_s$ candidate. [Preview Abstract] |
Saturday, April 12, 2008 10:57AM - 11:09AM |
B11.00002: Measurement of the $B^0_s$~Meson Lifetime with the CDF~II Detector Amanda Deisher We present a measurement of the $B^0_s$ meson lifetime using fully and partially reconstructed hadronic decays $B^0_s\rightarrow D_s^- \pi^+(X)$ followed by $D_s^- \rightarrow \phi\pi^-$. The data sample was recorded with the CDF~II detector at the Fermilab Tevatron and corresponds to an integrated luminosity of 1.3 fb$^{-1}$ from $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~TeV. [Preview Abstract] |
Saturday, April 12, 2008 11:09AM - 11:21AM |
B11.00003: A New Measurement of $B_s$ Mixing Parameters at the D0 Experiment Derek Strom New sources of CP violation are required to explain the universe around us. While CP violation has been extensively studied in the Kaon, $B_d$, and $B^+$ systems, no experimental information is available in the $B_s$ system. In this presentation, we outline several pioneering studies by the D0 Collaboration that have led to an accurate determination of the width difference in the $B_s$ system, $\Delta \Gamma_s$, and the first determination of the CP violating phase of $B_s$ mixing, $\phi_s$, using information from flavor- tagged decays. [Preview Abstract] |
Saturday, April 12, 2008 11:21AM - 11:33AM |
B11.00004: First Flavor-Tagged Determination of Bounds on Mixing-Induced $\textit{CP}$ Violation in $B_s^0 \rightarrow J/\psi\,\phi$ Decays Chunlei Liu We describe the first determination of bounds on the $\textit{CP}$-violation parameter $2\beta_s$ using $B_s^0$ decays in which the flavor of the bottom meson at production is identified. The result is based on $B_s^0 \rightarrow J/\psi\,\phi$ decays collected with the CDF\,II detector using $p\bar p$~collisions produced at the Fermilab Tevatron. We report confidence regions in the two-dimensional space of $2\beta_s$ and the decay-width difference $\Delta\Gamma$ and present the latest results. [Preview Abstract] |
Saturday, April 12, 2008 11:33AM - 11:45AM |
B11.00005: $B^0_s$ Meson Lifetime and $\Delta\Gamma_s$ in the $B^0_s\rightarrow K^+K^-$ Decay Mode Chiara Farinelli The measurement of the $B^0_s\rightarrow K^+K^-$ lifetime allows a determination of the decay width difference $\Delta\Gamma_s$ that is sensitive to possible new physics effects in penguin dominated $B_s^0$~decays. In Run\,II of the Fermilab Tevatron, the ability to trigger on hadronic decays, has allowed the CDF experiment to collect a large sample of $B^0_s\rightarrow K^+K^-$ events from $p\bar{p}$ collisions at $\sqrt{s}=1.96$~TeV. We report on the progress toward an updated measurement of the lifetime of $B^0_s$ mesons in this decay mode using a larger dataset than previous preliminary results. [Preview Abstract] |
Saturday, April 12, 2008 11:45AM - 11:57AM |
B11.00006: Evidence for $b \to d \gamma$ Transitions Using a Sum of Exclusive Final States Mark Tibbetts Making use of a sum of exclusive final states with up to three charged pions and one neutral pion or eta, we have demonstrated that it is possible to measure the ratio of the inclusive rates $b\to d \gamma$ and $b \to s \gamma$. This provides information on $|V_{td}/V_{ts}|$ that is complementary to using the exclusive modes $B \to \rho \gamma$ and $B \to K^* \gamma$. These results are from an analysis of data collected by the BaBar detector at the PEP-II asymmetric-energy $e^+ e^-$ storage rings at SLAC. [Preview Abstract] |
Saturday, April 12, 2008 11:57AM - 12:09PM |
B11.00007: Dalitz plot analysis of $B^{\pm} \to K^0_S \pi^\pm \pi^0$ Jennifer Prendki We report on a Dalitz plot analysis of the decay $B^{\pm} \to K^0_S \pi^\pm \pi^0$ performed by the BABAR experiment using a data sample with 383 million $B$ meson pairs. An isobar model including vector and scalar components is fitted to the data. From the fitted amplitudes the component branching fractions and CP charge asymmetries are extracted as well as constraints on some phases. How these measurements could possibly impact the determination of CKM parameters will be discussed. [Preview Abstract] |
Saturday, April 12, 2008 12:09PM - 12:21PM |
B11.00008: Search for the decay $B^+ \to K^+ \nu \bar \nu$ David Doll We present a search for the decay $B^+ \to K^+ \nu \bar \nu$ performed with data collected by the BaBar detector at the PEP-II asymmetric energy storage rings. The analysis is carried out in the recoil of a reconstructed $B$ using semileptonic tags (the tagged $B$ decays in a $D^{(*)0} \ell^+ \nu$ channel). We performed this study using both a cut-and-count method (BumpHunter tool in StatPatternRecognition), and multivariate approach (Random Forest tool included in StatPatternRecognition). A comparison of these studies is given. [Preview Abstract] |
Saturday, April 12, 2008 12:21PM - 12:33PM |
B11.00009: Observation of $\Upsilon(1S) \to \gamma K_S K_S$ Daniel Hogan Using data collected by the CLEO III detector at the Cornell Electron Storage Ring (CESR), we report on the observation of the radiative decay of $\Upsilon(1S)$ to $K_S K_S$ via production of $f_2'(1525)$. The $\Upsilon(1S)\rightarrow\gamma f_2'(1525)$ branching ratio obtained is consistent with previous measurements. [Preview Abstract] |
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