Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session B7: B Factory CP Violating Angles Gamma and Beta |
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Sponsoring Units: DPF Chair: William Carithers, University of California-Berkeley Room: Marriott Tampa Waterside Room 1 |
Saturday, April 16, 2005 10:45AM - 10:57AM |
B7.00001: Study of tag-side CP violation with a partially reconstructed $B\to D^{*}l\nu$ decays Francesco Renga Precise time-dependent CP violation measurements at B-Factories require measuring the CP violation that is expected to be present in the tagging B due to $b \to u$ amplitudes. We measure the CP violation parameters for tagging B mesons decaying to charged kaons by exploiting the conservation of CP in the semileptonic decays, using $B\to D^* l\nu$ events in approximately 88 M BBar pairs collected by the BaBar detector at the PEP-II $e^+e^-$ B-factory. [Preview Abstract] |
Saturday, April 16, 2005 10:57AM - 11:09AM |
B7.00002: Time Dependent Asymmetries in $b \to s\bar s s$ Transitions Emanuele DiMarco With 232~ $10^6$ $B\bar B$ meson pairs collected by the BaBar experiment, we studied the rare decays involving the elementary transition $b\to s$. Because of the absence of FCNC at tree level in the Standard Model, these decays proceed only through loop diagram, where heavy virtual particles can contribute, giving hints of New Physics. In this talk the results on time dependent and integrated CP asymmetry for some of these decays will be presented. [Preview Abstract] |
Saturday, April 16, 2005 11:09AM - 11:21AM |
B7.00003: Measurement of branching fractions and CP asymmetries for $B\to \eta^\prime$ K Giordano Cerizza We present preliminary measurements of branching fractions, charge asymmetries and time-dependent CP-violating asymmetries for the decays $B \to \eta^\prime K$. The data, corresponding to 232 million BBbar pairs, were produced at the PEP-II asymmetric-energy B factory at SLAC and collected with the BABAR detector. [Preview Abstract] |
Saturday, April 16, 2005 11:21AM - 11:33AM |
B7.00004: Measurement of the time-dependent CP asymmetry in B^0\to \pi^+\pi^-$ decays and observation of direct CP violation in the decay $B^0\to K^+\pi^-$ Xuanzhong Li We present a measurement of the time-dependent CP asymmetry in the decay $B^0\to \pi^+\pi^-$ and observation of direct CP violation in the decay $B^0\to K^+\pi^-$, using data collected with the BaBar detector at the PEP-II asymmetric energy $e^+e^-$ collider at SLAC. [Preview Abstract] |
Saturday, April 16, 2005 11:33AM - 11:45AM |
B7.00005: Study of $ B^0 \to D_{s}^{(*)+} \pi^{-},\ D_{s}^{(*)+} \rho^{-},\ D_{s}^{(*)+} K^{-}$ Decays Toyoko Orimoto We report on our study of $B^0$ mesons decaying into the final states $D_{s}^{(*)+} \pi^{-},\ D_{s}^{(*)+} \rho^{-},$ and $D_{s}^{(*)+} K^{-}$ using approximately 220 million $B$ decays collected by the BaBar detector at the PEP-II asymmetric $B$ Factory. Our study was done by exclusively reconstructing the modes $D_{s}^{*+} \to D_{s}^{+} \gamma,D_{s}^{+} \to \phi \pi^{+},\overline{K}^{*0} K^{+},$ and $\overline{K}^{0} K^{+}$. The result may potentially be useful in determining the $CP$ asymmetry parameter $\sin(2\beta+\gamma)$ in the decays $B^0 \to D^{(*)+} \pi^{-}$ and $B^0 \to D^{(*)+} \rho^{-}$. [Preview Abstract] |
Saturday, April 16, 2005 11:45AM - 11:57AM |
B7.00006: CP violation in $B \to D^{(*)}\bar{D^{(*)}}$ decays Timofei Piatenko The BaBar experiment at the Stanford Linear Accelerator Center is designed to make precision tests of the Standard Model of elementary particle physics. One of the main goals is to measure the angles of the unitarity triangle, which describes the mixing of quark flavors by the weak interaction. Charged and neutral $B\to D^{(*)}\bar{D^{(*)}}$ decays provide a mechanism for constraining the unitarity triangle as well as studying the phenomenon of CP violation. We study these decay modes using BaBar's data sample of 237 million $B\bar {B}$ pairs. [Preview Abstract] |
Saturday, April 16, 2005 11:57AM - 12:09PM |
B7.00007: Study of $B^+\to D^0 K^{*+}$ decays Guillaume Therin A search for direct CP violation using the Gronau-London-Wyler (GLW) and Atwood-Dunietz-Soni (ADS) methods in $B^+ \rightarrow D^0, \bar{D^0} K^{*+}$ decays is presented. The data sample used corresponds to 211 $fb^{-1}$ taken with the BaBar experiment. The results on the CP observables and the constraints on the CKM angle $\gamma$ are discussed. [Preview Abstract] |
Saturday, April 16, 2005 12:09PM - 12:21PM |
B7.00008: Branching ratio and decay asymmetry measurement of $B^- \to D^0 K^-$ with $D^0 \to \pi \pi \pi^0$ Qinglin Zeng We report on the observation of the decay $B^0\to D^0/\bar{D^0} K^-$ with $D^0/\bar{D^0} \to \pi \pi \pi^0$. Using data collected by BaBar with an integrated luminosity of about 203 $fb^{-1}$, we measure the branching fraction of this decay chain and its decay rate asymmetry. This mode can be used to measure the weak phase gamma through the interferences between the $b\to u \bar{c} d$ and $b\to c \bar{u} d$ decays. [Preview Abstract] |
Saturday, April 16, 2005 12:21PM - 12:33PM |
B7.00009: A study of $B^{0}\rightarrow \overline{D}^{0} (D^{0}) K^+ \pi^-$ decays Chih-hsiang Cheng We present a study of $B^{0}\rightarrow \overline{D}^{0} K^+ \pi^-$ and $B^{0}\rightarrow D^{0} K^+ \pi^-$ decays using a sample of 226 million $B \overline{B}$ pairs collected by the BaBar detector at the PEP-II asymmetric energy $e^+e^-$ collider. These two decays are through $b\rightarrow c$ and $b\rightarrow u$ diagrams respectively. If large decay amplitude overlap on the Dalitz plot is observed, one could improve the constraint on the CKM angle $\gamma$. In this analysis, we measure the branching ration of $B^{0}\rightarrow \overline{D}^{0} K^+ \pi^-$ outside the dominant $B^{0} \rightarrow D^{*-} K^+$ resonance, and the upper limit of the branching ratio of $B^{0}\rightarrow D^{0} K^+ \pi^-$. [Preview Abstract] |
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