Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session H14: Radiative and Penguin B Decays |
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Sponsoring Units: DPF Chair: Steve Sekula, Massachusetts Institute of Technology Room: Hyatt Regency Jacksonville Riverfront City Terrace 10 |
Sunday, April 15, 2007 8:30AM - 8:42AM |
H14.00001: Search for $B \to K^{(*)} \nu \bar{\nu}$ Francesco Renga We present a search for the decay $B \rightarrow K^{(*)} \nu \bar{\nu}$ in $\Upsilon(4S)\rightarrow B\bar{B}$ decays recorded with the BaBar detector at the SLAC PEP-II $B$ Factory. A sample of events where one $B$ is fully reconstructed is selected, and in the recoil a search for the $B \rightarrow K^{(*)} \nu \bar{\nu}$ signal is performed. In order to suppress background a number of kinematic and shape variable selection criteria are used. Features of the signal dynamics and topology are exploited by imposing constraints on signal variables such as the momentum, multiplicity and mass. We describe the search techniques and provide the most recent results from BaBar. [Preview Abstract] |
Sunday, April 15, 2007 8:42AM - 8:54AM |
H14.00002: Study of $b \to d \gamma$ transitions with BaBar Tim Beck Making use of a sum of exclusive final states with up to three charged pions and one neutral pion or eta, we have demonstrated that it is possible to measure the ratio of the inclusive rates $b \rightarrow d \gamma$ and $b \rightarrow s \gamma$. This provides a determination of $|V_{td}/V_{ts}|$ that is complementary to using the exclusive modes $B \rightarrow \rho \gamma$ and $B \rightarrow K^*\gamma$. [Preview Abstract] |
Sunday, April 15, 2007 8:54AM - 9:06AM |
H14.00003: Study of $B\to K^*ll$ decays with BaBar Jennifer Watson Measurements of the FCNC decay $B\to K^*ll$ allow for sensitive tests of the Standard Model due to possible New Physics contributions in the interference between penguin and box diagrams. Results from BaBar on the forward-backward lepton asymmetry and $K^*$ polarization are presented. The study of additional angular variables and the extension of the analysis to inclusive $b\to sll$ decays are also discussed. [Preview Abstract] |
Sunday, April 15, 2007 9:06AM - 9:18AM |
H14.00004: ABSTRACT WITHDRAWN |
Sunday, April 15, 2007 9:18AM - 9:30AM |
H14.00005: Measurement of the $B \to X_s \gamma$ branching fraction and photon energy Stephen Sekula We present a measurement of the branching fraction and photon energy spectrum for the decay $B \to X_s \gamma$. This measurement uses approximately 750,000 $B\bar{B}$ events that are tagged by a fully reconstructed hadronic decay of one of the $B$ mesons. In the decay of the second $B$ meson an isolated high energy photon is identified. The small contribution from $B \to X_d\gamma$ is subtracted using theoretical predictions. The full reconstruction of one of the $B$ mesons results in improved background suppression and allows for an inclusive measurement of the photon energy spectrum in the $B$ rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies and use them to extract the heavy quark parameters $m_b$ and $\mu_{\pi}^2$. In addition, a measurement of the direct $CP$ asymmetry $A_{CP}(B \to X_{s+d} \gamma)$ is presented. [Preview Abstract] |
Sunday, April 15, 2007 9:30AM - 9:42AM |
H14.00006: Angular analysis of $B\to\phi K^*$ decays Yanyan Gao We perform an amplitude analysis of the decays $B\to\phi K^{*}$. The analysis is based on a sample of 384 million $B\bar{B}$ pairs recorded with the BaBar detector. Several $K^{*}$ resonances are studied. The fraction of longitudinal polarization and $CP$ asymmetries are measured for the modes studied. [Preview Abstract] |
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