Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session P12: Bs, Bc Lifetimes and Mixing |
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Sponsoring Units: DPF Chair: Nigel Lockyer, University of Pennsylvania Room: Hyatt Regency Dallas Cumberland F |
Monday, April 24, 2006 10:45AM - 10:57AM |
P12.00001: Hadronic Decays for the $B_s$ Oscillation Measurement at D\O Gernot Weber The status of the measurements of hadronic $B_s$ decays at the D\O\ experiment at Fermilab is presented. D\O\ limits of the mass difference $\Delta m_s$ in the $B_s$ system have been obtained so far using semileptonic decays. Due to the fact that in hadronic $B_s$ decays all daughter particles are reconstructible a much better sensitivity for larger $\Delta m_s$ values is expected here. Results of the present performance of the triggering strategy and reconstruction of hadronic $B$ decays will be shown. [Preview Abstract] |
Monday, April 24, 2006 10:57AM - 11:09AM |
P12.00002: Study of $B_s$ oscillations using semileptonic decays Dan Krop We report preliminary results on the search for $B_{s}$ oscillations using approximately 910 pb$^{-1}$ of data taken at the D\O\ experiment during Run IIa at the Tevatron. We search for oscillations in the time dependence of semileptonic decays of the $B_{s}$, $B_{s}\rightarrow D_{s}l X$ where the flavor of the $B_s$ at production is determined by studying inclusive properties of the event. [Preview Abstract] |
Monday, April 24, 2006 11:09AM - 11:21AM |
P12.00003: Same Side Kaon Tagging Studies in Fully Reconstructed Decays Gian Piero Di Giovanni Currently the Tevatron is the only place where $B_s$ mesons are produced. The mass difference of the $B_s$ and its antiparticle is not yet known. We present here the development of a b-quark flavor tagger that largely enhances the sensitivity power of the CDF experiment to observe $B_s$ oscillations. This b-quark flavor tagging algorithm is based on the charge correlation between the signal B meson and the fragmentation tracks produced nearby. Relying on simulation events, we evaluate the performance of the same side (flavor) tagger on fully reconstructed Bu, Bd and Bs decay modes. [Preview Abstract] |
Monday, April 24, 2006 11:21AM - 11:33AM |
P12.00004: $B_s$ Mixing Results for Hadronic and Semileptonic Decays at CDF Jeffrey Miles We report preliminary results for $B_s$ oscillation from CDF Run II at the Fermilab Tevatron collider. The analysis combines hadronic and semileptonic channels from 355 pb$^{-1}$ of data collected by a displaced-track trigger which uses CDF's precision silicon tracking. New techniques in flavor tagging and event reconstruction and the addition of new decay modes yield a significant improvement in mixing sensitivity as compared to earlier CDF results. [Preview Abstract] |
Monday, April 24, 2006 11:33AM - 11:45AM |
P12.00005: A precise measurement of the $B^0_s$ lifetime Alberto Sanchez We report the lifetime measurement of the flavor--specific $B_s^0$ meson decay $B^0_{s}\rightarrow D^-_s \mu^{+}\nu X$, using approximately 400 pb$^ {-1}$ of data collected by the D\O\ detector during 2002--2004. We have reconstructed 5176 $D^-_s \mu^{+}$ candidate events, from which we have measured the $B^0_s$ lifetime with a combined statistical and systematic uncertainty of less than 16 $\mu$m which is the currently most precise measurement of the $B_s^0$ lifetime. [Preview Abstract] |
Monday, April 24, 2006 11:45AM - 11:57AM |
P12.00006: Measurement of the $B_c$ Lifetime Using the $B_c\rightarrow J/\psi + \mu^{\pm} + X$ Decay Channel Mark Hartz We report on a measurment of the lifetime of the $B_c$ meson in the semileptonic decay mode $B_c\rightarrow J/\psi + \mu^{\pm} + X$ with $J/\psi \rightarrow \mu^+ \mu^-$. The measurement utilizes 360 pb$^{-1}$ of data collected with the CDF II detector during Run II of the Fermilab Tevatron in pbarp collisions at $\sqrt{s} = 1.96$ TeV. We build a likelihood function, consisting of signal and background lifetime distribution functions, which is maximized when applied to the data sample of $J/\psi + \mu^{\pm}$ events to extract a measurement of the lifetime. [Preview Abstract] |
Monday, April 24, 2006 11:57AM - 12:09PM |
P12.00007: Study of the $B_c$ lifetime via the decay $B_c \rightarrow J/\psi \mu \nu X$ Leah Welty-Rieger The $B_c$ meson is unique as a meson in that it contains two different, yet heavy quarks, resulting in a lifetime that is expected to be shorter than the other $b$ hadrons. Using approximately 1 fb$^{-1}$ of data collected with the D$\O$ detector at the Fermilab Tevatron during Run \textrm{II}, the $B_c$ meson in the semileptonic mode $B_c^\pm \rightarrow J/\psi \mu^\pm \nu X$ is studied. Preliminary results on the measured lifetime of this particle are presented. [Preview Abstract] |
Monday, April 24, 2006 12:09PM - 12:21PM |
P12.00008: Probing Quark Fragmentation with Ds-K Correlations at CDF Niharika Ranjan High statistics samples of Ds+ and D+ decays have been recorded with the CDF-II detector at the Fermilab Tevatron. To conserve strangeness, prompt Ds+ mesons are expected to be frequently produced in association with K- mesons. The differences between the kinematic distributions of kaons produced in association with Ds+ compared with those produced in association with D+ mesons is sensitive to details of the quark fragmentation process that have not previously been studied directly. An accurate modelling of kaon production in association with heavy quark fragmentation is needed to determine the effectiveness of a ``same-side kaon tag'' which is expected to provide a powerful means of determining the production flavor of $B^0_s$ mesons and should significantly improve the sensitivity of the analysis of $B^0_s$ oscillations at CDF. [Preview Abstract] |
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