Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session U14: B Physics II |
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Sponsoring Units: DPF Chair: Mark Convery, Stanford Linear Accelerator Center Room: Hyatt Regency Jacksonville Riverfront City Terrace 10 |
Monday, April 16, 2007 3:30PM - 3:42PM |
U14.00001: ABSTRACT WITHDRAWN |
Monday, April 16, 2007 3:42PM - 3:54PM |
U14.00002: $B$ Meson Lifetimes in $B \to J/\psi X$ Modes Chunlei Liu Lifetimes of four species of $b$-hadrons are measured with the CDF detector at the Tevatron Collider in exclusive final states containing a $J/\psi$. The $B^0$ and $B^+$ meson lifetimes are individually measured with precision approaching the 1\% level. We present lifetimes and lifetime ratios for those states. The same techniques used for the precision measurement of $B^0$ and $B^+$ are applied to the $B^0_s$~meson and $\Lambda_b$~baryon, both produced only at the Tevatron. We also present new lifetime measurements for these $b$-hadrons. [Preview Abstract] |
Monday, April 16, 2007 3:54PM - 4:06PM |
U14.00003: Measurement of $B$ Meson Lifetimes Using a Monte Carlo Independent Approach Sneha Malde We present a measurement of the $B^+$ and $B^0$ lifetime in the fully reconstructed decay modes $B^+ \to D^0 \pi^+$ and $B^0 \to D^+ \pi^-$ with $D^0 \to K \pi$ and $D^+ \to K \pi \pi$, respectively. We use 1~fb$^{-1}$ of data taken with the CDF\,II detector using the high impact parameter trigger. A lifetime bias is introduced by the trigger. This bias is accounted for by a calculation of the exact acceptance function on an event by event basis without the need to use Monte-Carlo simulation to model this bias. [Preview Abstract] |
Monday, April 16, 2007 4:06PM - 4:18PM |
U14.00004: Measurement of the $B$~Meson Production Cross Section Using $B\to\mu^- D^0 X$ James Kraus We present a measurement of the cross section of $B$~meson production in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~TeV using the CDF\,II detector at the Fermilab Tevatron. We use 83~pb$^{-1}$ of data taken between October 2002 and May 2003 that was collected with a trigger sensitive to high momentum muons and displaced tracks. We use partially reconstructed decays in the following modes: $B \to \mu^{-} D^0 X$, $D^0 \to K^{-} \pi^{+}$, $B \to \mu^{-} D^{*+} X$, $D^{*+} \to D^{0} \pi^{+}$, $D^0 \to K^{-} \pi^{+}$, and their charge conjugates. We correct for irreducible backgrounds, trigger efficiencies, and detector acceptance. We report the total cross section above a minimum transverse momentum ($p_T$) of 9~GeV/$c$ for the rapidity range $|y|\leq 0.6$. [Preview Abstract] |
Monday, April 16, 2007 4:18PM - 4:30PM |
U14.00005: Measurement of $\Sigma_{b}$ Baryons with the CDF\,II Detector John Ash Recently the CDF Collaboration reported the first observation of the bottom baryon states $\Sigma_{b}$. Using $\sim$~1~fb$^{-1}$ of CDF data, we present an update on the $\Sigma_{b}$ result based on an enlarged data sample of fully reconstructed $\Lambda_{b}$ decays collected by the CDF~II detector using several trigger paths. [Preview Abstract] |
Monday, April 16, 2007 4:30PM - 4:42PM |
U14.00006: Search for a $J/\psi \omega$ resonance at Babar Arafat Gabareen Mokhtar A sample of 384 million $\Upsilon(4S)\to B\bar{B}$ events collected by the BaBar experiment is analyzed to search for $B\rightarrow YK$ ($Y\to J/\psi \omega$) decays. In this talk, I will present the results of this study as well as a comparison between our results with those obtained at other experiments. [Preview Abstract] |
Monday, April 16, 2007 4:42PM - 4:54PM |
U14.00007: Evidence for $B^0\to\rho^0\rho^0$ decays Ilya Osipenkov We present the results of a search for $B^0\rightarrow\rho^0\rho^0$ decays. The analysis is based on a sample of 384 million $B\bar{B}$ pairs recorded with the BaBar detector. We extract $100^{+32}_{-31}\pm 17$ $\rho^0\rho^0$ events, corresponding to a branching fraction of $(1.07^{+0.34+0.19}_{-0.32-0.18})\times 10^{-6}$, and a fraction of longitudinally polarized events of $0.87^{+0.12}_{-0.13}\pm 0.04$. The significance of the signal is 3.5$\sigma$ including systematics. We estimate the systematic uncertainty on the CKM unitarity angle $\alpha$, due to penguin contributions, to be $18^{\circ}$ at the 1$\sigma$ level. [Preview Abstract] |
Monday, April 16, 2007 4:54PM - 5:06PM |
U14.00008: Hadronic Transitions in the Bottomonium System Todd Pedlar The CLEO experiment has collected 5.9 million $\Upsilon(3S)$ and 8.8 million $\Upsilon(2S)$ decays. We report results from studies of both charged and neutral two-pion transitions: $\Upsilon(3S)\rightarrow\Upsilon(2S)\pi\pi$, $\Upsilon(3S)\rightarrow\Upsilon(1S)\pi\pi$ and $\Upsilon(2S)\rightarrow\Upsilon(1S)\pi\pi$. We report measurements of the branching ratios for these transitions, the two-pion invariant mass distributions, and the decay matrix elements for the transition. These measurements can be extended to searches for other hadronic transitions (including those involving $\eta$) within the bottomonium system. [Preview Abstract] |
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