Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session H8: Tevatron B Physics I |
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Sponsoring Units: DPF Chair: John Womersley, Fermilab Room: Marriott Tampa Waterside Room 4 |
Sunday, April 17, 2005 8:30AM - 8:54AM |
H8.00001: Analysis of decay-time dependence of angular distributions in$B^0_s \rightarrow J/\psi \phi$ and a measurement of the lifetime difference between $B^0_s$ CP eigenstates Leah Welty We study the decay processes $B^0_s \rightarrow J/\psi \phi$ and $B^0_d \rightarrow J/\psi K^*$ using the first 440~pb$^{-1}$ of D\O\ data. We measure the average lifetime and the relative lifetime difference for the $B^0_s$ system. We also measure the $B^0_d$ lifetime (assuming a single-exponential decay), and the $P$-wave fraction $R_{\perp}$ for $B^0_s$ and $B^0_d$. [Preview Abstract] |
Sunday, April 17, 2005 8:54AM - 9:06AM |
H8.00002: Study of $\Lambda_b$ using semileptonic decays at the Tevatron Marcus Lewin A large sample of semileptonic decays $\Lambda_b \rightarrow \Lambda_c \mu \nu$ was selected in the Run II data collected by D\O\ detector at Fermilab. Preliminary results on properties of the $\Lambda_b$ baryon using this sample are presented. [Preview Abstract] |
Sunday, April 17, 2005 9:06AM - 9:18AM |
H8.00003: A study of the decay $\Lambda_b^0\to\Lambda_c^+\pi^-\pi^+\pi^-$ at CDF Brianna Schuyler Using $\sim 360$~pb$^{-1}$ of Run~II data collected by the CDF detector, we search for the decay $\Lambda_b^0\to\Lambda_c^+\pi^-\pi^+\pi^-$, in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~TeV, where $\Lambda_c$ baryon is reconstructed as $\Lambda_c^+\to p^+K^-\pi^+$. This decay mode is plagued by a substantial combinatorial background arising from a large track multiplicity characteristic of hadronic environment. We investigate ways of suppressing the combinatorial background in order to extract the $\Lambda_b$ signal. [Preview Abstract] |
Sunday, April 17, 2005 9:18AM - 9:30AM |
H8.00004: An observation of Cabibbo-suppressed decays $\Lambda_b^0\to\Lambda_c^+K^-$ at CDF Rober Bauer Using $\sim 360$~pb$^{-1}$ of Run~II data collected by the CDF detector, we reconstruct the Cabibbo-suppressed decay $\Lambda_b^0\to \Lambda_c^+K^-$, followed by $\Lambda_c^+\to p^+K^- \pi^+$. The main background to this decay is the Cabibbo-allowed decay $\Lambda_b^0\to\Lambda_c^+\pi^-$, and the yields for both are obtained simultaneously from the same data sample. [Preview Abstract] |
Sunday, April 17, 2005 9:30AM - 9:42AM |
H8.00005: study of $B^0 \to\phi K_s^0$ and $\Lambda_b \to \phi \Lambda$ decays at CDF Matthew Rudolph Using over $330$~pb$^{-1}$ of Run~II data collected by the CDF detector, we evaluate the prospects for reconstructing gluonic penguin decays $B^0 \to\phi K_s^0$ and $\Lambda_b \to \phi \Lambda$ in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~TeV. The $K_s^0\to\pi^+\pi^-$ and $\Lambda \to p^+\pi^-$ decays are reconstructed using a decidated algorithm, which is studied using $D^0 \to \phi K_s^0$ decays. [Preview Abstract] |
Sunday, April 17, 2005 9:42AM - 9:54AM |
H8.00006: Heavy quark studies using $B^+ \rightarrow J/\psi K^{*+}$ Mark Smith We study the properties of $b$ hadrons using the decay $B^+ \rightarrow J/\psi K^{*+}$ where the $J/\psi$ is reconstructed in the decay $J/\psi \rightarrow \mu^+ \mu^-$, the $K^{*+}$ in the decay chain $K^{*+} \rightarrow K^0_S \pi^+$ and $K^0_S \rightarrow \pi^+ \pi^-$. We also discuss the role of $K^{*+}$ in mixing studies with same-side tagging. [Preview Abstract] |
Sunday, April 17, 2005 9:54AM - 10:06AM |
H8.00007: $B0$ Mixing and Flavor Taggers in Exclusive $B$ Decays at CDF Alberto Belloni Since May 2002 the CDF detector at Fermilab's Tevatron $p \bar{p}$ collider has collected around $360~pb^{-1}$ of physics quality data, about three times as much as the previous Run I data set. The new Silicon Vertex Trigger processor allows one to select events containing displaced tracks, opening up the collection of fully hadronic samples enriched in charm and beauty hadrons. In particular, it permits the measurement of the $B_s$ oscillation frequency on fully reconstructed hadronic samples. Measurement of the $B0$ mixing frequency is an important milestone towards a $B_s$ mixing analysis. Preliminary studies of $B0$ mixing using the {\it same-side} and {opposite-side} flavor tagging techniques are presented. For this analysis a large number of fully hadronic decays are combined. [Preview Abstract] |
Sunday, April 17, 2005 10:06AM - 10:18AM |
H8.00008: Measurement of $B0\bar B0$ Oscillation Frequency and Calibration of Flavour Tagging with $B \rightarrow D\ell X$ Decays Gavril Giurgiu Using $p\bar p$ collision data at $\sqrt{s} = 1.96$~TeV collected with the CDF\,II experiment at the Fermilab Tevatron collider, we measure the oscillation frequency $\Delta m_d$ of $B0 \bar B0$ mixing using partially reconstructed semileptonic decays $B \rightarrow D\ell X$. The charge of the lepton in the final state identifies the flavour of the $B0$~meson at its decay. The flavour of the $B0$ meson at production is inferred by an opposite side lepton or jet charge tag. This study also serves as calibration of the flavour tagging algorithms used in a search for $B0_s$~mixing using semileptonic $B0_s \rightarrow D^+_s\ell X$ decays. [Preview Abstract] |
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