Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session T9: B Physics II |
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Sponsoring Units: DPF Chair: Patricia McBride, Fermilab Room: Governor's Square 11 |
Monday, May 4, 2009 3:30PM - 3:42PM |
T9.00001: Measurement of the $B_s^0$ Mixing Phase $\beta_s$ with the CDF\,II Detector Elisa Pueschel We present the latest CDF results on the determination of the $B_s^0$ mixing phase $\beta_s$, based on an angular- and time-dependent analysis of the $B_s^0\rightarrow J/\psi \phi$ decay mode, including determination of the flavor of the $B_s^0$~meson at production. We discuss the compatibility of the result with Standard Model predictions as well as combination with other results and give prospects for further improved precision measurements. [Preview Abstract] |
Monday, May 4, 2009 3:42PM - 3:54PM |
T9.00002: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 3:54PM - 4:06PM |
T9.00003: Study of the $B_s^0\rightarrow\phi\phi$ Decay and Measurement of its Branching Ratio with CDF Lorenzo Ortolan We present a measurement of the $B_s^0\rightarrow\phi\phi$ branching ratio using approximately 2.9~fb$^{-1}$ of data collected with the CDF\,II detector at the Fermilab Tevatron. The first measurement of this decay mode was performed at CDF in 2005 using a 180~pb$^{-1}$ data sample where eight signal events were seen. We select events in the displaced track trigger sample and optimize the event selection requirements. The procedure to optimize the selection and estimates of the expected background are described. The preliminary result for the branching ratio is in agreement with theoretical predictions and the previous analysis. It is now dominated by the experimental uncertainty in the $B_s^0 \rightarrow J/\psi \phi$ branching ratio which is used for normalization. [Preview Abstract] |
Monday, May 4, 2009 4:06PM - 4:18PM |
T9.00004: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 4:18PM - 4:30PM |
T9.00005: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 4:30PM - 4:42PM |
T9.00006: Measurement of $\Gamma_s$ and $\Delta\Gamma_s$ from $B_s^0\rightarrow J/\psi \phi$ at CDF Louise Oakes We measure the mean lifetime, $\tau_s=2/(\Gamma_L+\Gamma_H)$, and the width difference, $\Delta\Gamma_s=\Gamma_L-\Gamma_H$, of the light and heavy mass eigenstates of the $B^0_s$~meson in $B_s^0 \rightarrow J/\psi \phi$ decays. The analysis is based on $\sim4$~fb$^{-1}$ of $p\bar{p}$~collisions collected with the CDF\,II detector at the Fermilab Tevatron. [Preview Abstract] |
Monday, May 4, 2009 4:42PM - 4:54PM |
T9.00007: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 4:54PM - 5:06PM |
T9.00008: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 5:06PM - 5:18PM |
T9.00009: Measurement of Branching Fraction and $CP$ Asymmetry in $B^-\rightarrow D^0_{DCS} \pi^-$ Paola Garosi The CKM angle $\gamma$ can be cleanly determined from $CP$~asymmetries in suppressed $B^{-}\to D^0 K^-$ decays, where it enters at tree-level. The decays where the $D^{0}$ goes into the doubly Cabibbo-suppressed mode $D^0_{DCS} \rightarrow K^- \pi^+$ are particularly useful in this respect, but they are very rare and have not yet been observed, while only a few tens of events have been reconstructed for the less rare $B^- \rightarrow D^0_{DCS}\pi^-$ decay mode. We present the first analysis of these modes performed in $p\bar p$~collisions, using a sample of about 2~fb$^{-1}$ of data collected by the CDF Collaboration with an impact-parameter trigger. We report preliminary measurements of the branching fraction and $CP$~asymmetry for the $B^- \rightarrow D_{DCS}\ \pi^-$ decay mode. [Preview Abstract] |
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