Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session G13: B Physics I |
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Sponsoring Units: DPF Chair: David Saltzberg, University of California, Los Angeles Room: Plaza Court 3 |
Sunday, May 3, 2009 8:30AM - 8:42AM |
G13.00001: Precision Measurement of the Exclusive $B^0 \to D^{*-} \ell^+ \nu$ Branching Fraction Peter Sonnek, Lucien Cremaldi, Romulus Godang We report on a precision measurement of the exclusive $B^0 \to D^{*-} \ell^+ \nu$ branching fraction using data collected with the {\it B{\footnotesize A}B{\footnotesize AR}} detector at the PEP-II asymmetric-energy $e^+e^-$ storage rings at SLAC running on the $\Upsilon(4S)$ resonance. Using a data sample of approximately 470 million $B\bar{B}$ pair events we isolate those with the prompt lepton and slow pions from the $D^{*-} \to D^0 \pi_{slow}$ cascade decay. A partial reconstruction technique is used in which the $D^*$ four- momentum is inferred from the slow pion, $\pi_{slow}$. This allows for a much higher statistical precision on this important branching fraction as well as an overall systematic error competitive with full reconstruction techniques. [Preview Abstract] |
Sunday, May 3, 2009 8:42AM - 8:54AM |
G13.00002: Search for $B_c$ Mesons Using the $B_c \rightarrow B^0_s X$ Decay Channel at CDF Edwin Rogers To date, the $B_c$ meson has only been observed in $B_c \rightarrow J/\psi$~$\pi$ and $J/\psi\ell X$ final states, while the dominant decay modes are expected to be in the $B_c \rightarrow B^0_s X$ channel. We present the results of a first search for the $B_c$~meson through $B_c \rightarrow B^0_s X$. The measurement uses 3~fb$^{-1}$ of data collected with the CDF\,II detector during Run\,II of the Fermilab Tevatron in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~TeV. The analysis is based on a neural network selection and combines the $B^0_s$ decay modes into $J/\psi\phi$, $D_s^{\pm}\pi$, and $D_s^{\pm}3\pi$. [Preview Abstract] |
Sunday, May 3, 2009 8:54AM - 9:06AM |
G13.00003: ABSTRACT WITHDRAWN |
Sunday, May 3, 2009 9:06AM - 9:18AM |
G13.00004: Time-dependent Dalitz-plot analysis of $B^0 \to K_S \pi^+ \pi^-$ Jelena Ilic We report on a time-dependent Dalitz-plot analysis of the decay $B^0 \to K_S \pi^+ \pi^-$ performed by the {\sl B{\scriptsize A}B {\scriptsize AR}} experiment. An isobar model including scalar, vector and tensor components is fitted to the data and the Unitarity Triangle (UT) angle $\beta_{eff}$ is extracted for the modes $B^0 \to f_0 K_S$ and $B^0 \to \rho^0 K_S$. In addition, the phase difference between $B^0 \to K^{*+}\pi^-$ and $\overline{B^0} \to K^{*-}\pi^+$ is determined. This phase difference is a critical input for a recently developed method for extracting the UT angle $\gamma$. [Preview Abstract] |
Sunday, May 3, 2009 9:18AM - 9:30AM |
G13.00005: Measurement of Correlations in $b$ Quark Pair Production at the Tevatron Jason Galyardt We present an analysis of $b\bar{b}$ pair production correlations, using dimuon-triggered data collected with the Collider Detector at Fermilab in $p\bar{p}$ collisions at $\sqrt{s}$=1.96 TeV during Run\,II of the Tevatron. The leading order (LO) and next-to-leading order (NLO) $b$ quark production processes are discriminated by the angular and momentum correlations between the $b\bar{b}$ pair. Track-level jets containing a muon are classified by $b$ quark content and used to estimate the momentum vector of the progenitor $b$ quark. The theoretical distributions given by the MC@NLO event generator are tested against the data, and the ratio of LO to NLO processes as a function of $\hat{s}$ is measured. [Preview Abstract] |
Sunday, May 3, 2009 9:30AM - 9:42AM |
G13.00006: ABSTRACT WITHDRAWN |
Sunday, May 3, 2009 9:42AM - 9:54AM |
G13.00007: Measurement of Branching Fractions in $B \to K \nu \bar{\nu}$ Decays Carl Vuosalo Flavor changing neutral-current transitions such as $b \to s \gamma$ are absent at tree level in the Standard Model and can only occur via loop diagrams. Several new physics models may enhance the rate of these transitions. We will present searches for the exclusive decays $B^{\pm} \to K^+ \nu \bar{\nu}$ and $B^0 \to K_s \nu \bar{\nu}$. Due to the presence of two neutrinos in the final state, we require the full reconstruction of one $B$-meson in the semileptonic decay channel $B^{\pm} \to D^{(*)0} \ell \nu$ and search in the recoil for our decay modes. This analysis uses approximately 430~fb$^{-1}$ or 470 million $B\bar{B}$ pairs collected with the {\sl B{\scriptsize A}B {\scriptsize AR}} detector at the PEP-II B-factory. [Preview Abstract] |
Sunday, May 3, 2009 9:54AM - 10:06AM |
G13.00008: Multipole Moments in Radiative Transitions of Charmonia James Ledoux Using 24 million $\psi(2S)$ decays created from $e^+e^-$ collisions collected with the CLEO-c detector, we search for the multipole moments M2 and E3 of the radiative transitions in charmonia. The multipole moments are identified by an unbinned maximum likelihood fit to the joint angular distribution of the photons in the decay sequences $\psi(2S) \to \gamma \chi_{(c1,c2)}$, $\chi_{(c1,c2)} \to \gamma J/\psi$, $J/\psi \to \ell^+ \ell^-$. [Preview Abstract] |
Sunday, May 3, 2009 10:06AM - 10:18AM |
G13.00009: Measurement of $B_{c}^{+} \rightarrow J/\psi \mu^{+} \nu$ Cross Section Times Branching Ratio Relative to $B^+ \rightarrow J/\psi K^+$with the CDF\,II Detector Turgun Nigmanov The production cross section times branching ratio for $B_{c}^{\pm} \rightarrow J/\psi \mu^{\pm} \nu$ relative to $B^{\pm} \rightarrow J/\psi K^{\pm}$ is measured using an inclusive $J/\psi$ trigger stream with an integrated luminosity of 1~fb$^{-1}$. The results are an update of earlier work by the CDF Collaboration that used an integrated luminosity of 360~pb$^{-1}$. The measurement is made in the kinematic region $-1.0 < \eta < 1.0$ for both $p_T(B_c) >$ 4 and 6~GeV/$c$. The new results along with a comparison with earlier results will be presented. [Preview Abstract] |
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