Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session X8: Charm and B Physics III |
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Sponsoring Units: DPF Chair: Stan Brodsky, SLAC National Accelerator Laboratory Room: Grand F |
Tuesday, May 3, 2011 10:45AM - 10:57AM |
X8.00001: Observation of X(3872) $\rightarrow$Jpsipipi through exclusive B decays in ppbar collisions Colorado Reed Observation of X(3872)$\rightarrow$Jpsipipi through exclusive B decays reconstructed by the CDF II detector is reported, using 6/fb of ppbar collision data. The Jpsipipi mass spectrum was fit assuming the presence of a Breit-Wigner resonance, yielding a measurement of the signal yield and its mass. [Preview Abstract] |
Tuesday, May 3, 2011 10:57AM - 11:09AM |
X8.00002: Observation of the $X(3872)$ in $pp$ collisions at 7 TeV Warren Clarida This talk reports the observation of the $X(3872)$ state in $pp$ collisions at $\sqrt{s}=7~\mathrm{TeV}$, through the analysis of the decay channel $X(3872)\rightarrow{}J/\psi\pi^{+}\pi^{-}$, using the data collected by the CMS experiment in 2010. [Preview Abstract] |
Tuesday, May 3, 2011 11:09AM - 11:21AM |
X8.00003: ABSTRACT WITHDRAWN |
Tuesday, May 3, 2011 11:21AM - 11:33AM |
X8.00004: Measurements of beauty cross sections at the CMS experiment Alice Bean The CMS experiment at the Large Hadron Collider has recorded proton-proton collision data at a center of mass energy of 7 TeV during 2010. Several measurements have been made of production cross sections involving the b quark. The open beauty production cross section is presented as a function of muon transverse momentum and pseudorapidity. The mode $B \to \mu D^0 X$ is studied. Also presented is a $\Lambda_b$ integrated cross section measurement. [Preview Abstract] |
Tuesday, May 3, 2011 11:33AM - 11:45AM |
X8.00005: Measurement of the lifetime of the $B_c$ meson using fully reconstructed $B_c \rightarrow J/\psi \pi$ decays at CDF Hao Song The CDF collaboration reports the first measurement of the $B_c$ meson lifetime obtained using a fully reconstructed final state. The $B_c$ meson is unique in being composed of two relatively heavy and distinct quarks which can both decay weakly contributing to its lifetime. Decays into a $J/\psi$ meson and a charged pion are reconstructed with sufficient statistics and purity to provide a $B_c$ lifetime measurement of comparable precision to previous determinations. [Preview Abstract] |
Tuesday, May 3, 2011 11:45AM - 11:57AM |
X8.00006: A Measurement of the \(b\) and \(c\) Production Fractions with Fully Reconstructed \(D^{*+}\) Mesons in the ATLAS Detector at \(\sqrt{s}=7~\rm{TeV} \) Jessica Metcalfe A measurement of the ratio of the number of \( D^{*+} \) mesons originating from a \(b\)-quark and from a directly produced charm is presented. The charm mesons are fully reconstructed in the mode \( D^{*+}\,\rightarrow\,D^{0}\pi^{+} \) where \( D^{0}\,\rightarrow\,K^{-}\pi^{+} \). The analysis is based on data collected from the minimum bias trigger of the ATLAS detector at \(\sqrt{s}=7~\rm{TeV} \) proton-proton collisions produced by the LHC. The distribution of the impact parameter of the \( D^{0} \) meson with respect to the primary vertex is studied to distinguish charm mesons produced promptly or from those through b-quark decays. The measurement of the fraction of bottom and charm quarks to the decay channel \( D^{*+}\,\rightarrow\,D^{0}\pi^{+} \), \( D^{0}\,\rightarrow\,K^{-}\pi^{+} \) applied to the total cross-section measurement of the same decay channel yields the cross-sections for direct charm and bottom production to \( D^{*+} \). I then compare the cross-section values extracted from data to NLO QCD calculations that depend on the parton distributions and fragmentation functions illuminating these Standard Model processes. [Preview Abstract] |
Tuesday, May 3, 2011 11:57AM - 12:09PM |
X8.00007: Exclusive Semileptonic $D_s$ Decays Jonathan Insler We have measured several semileptonic branching fractions of the $D_s$ meson with 586~pb$^{-1}$ integrated luminosity collected by the CLEO-c detector near the $D_s\bar{D}^*_s$ peak production energy of $E_{cm} = 4170$~MeV in $e^+e^-$ collisions. We reconstruct the complete decays by tagging the hadronic decay of one $D_s$, identifying the photon produced by the $\bar{D}_s^*$ decay, and finding the electron and hadron of the semileptonic decay. By inferring the missing neutrino momentum, we count the number of reconstructed exclusive semileptonic decays and compute the branching fractions. [Preview Abstract] |
Tuesday, May 3, 2011 12:09PM - 12:21PM |
X8.00008: Upsilon(1S) Production In Proton-Proton Collisions at Center of Mass Energy 7 TeV Maxwell Scherzer A measurement of the cross section for $\Upsilon(1S)$ production in proton-proton collisions at center of mass energy 7 TeV is presented. The measurement covers the rapidity ranges $|y^{\Upsilon}|<1.2$ and $1.2<|y^{\Upsilon}|<2.4$ in the transverse momentum range $p_{T}^{\Upsilon}$ $<$ 26 GeV. The results are based on an integrated luminosity of approximately 1.2pb$^{-1}$, collected with the ATLAS dectector at the Large Hadron Collider. The signal extraction uses templates derived from data to model the continuum background. Results are compared to predictions from next-to-leading order perturbative QCD calculations. [Preview Abstract] |
Tuesday, May 3, 2011 12:21PM - 12:33PM |
X8.00009: A measurement of the double-differential production cross section for the J/$\psi $ resonance and the non-prompt J/$\psi $ cross section fraction with pp $\surd $s = 7 TeV in ATLAS Andrew Nelson The inclusive production of the J/$\psi $ resonance is studied with the ATLAS detector in LHC proton-proton collisions at $\surd $s = 7 TeV using the J/$\psi $ decay mode to two muons. Two physics measurements are presented using the first few pb$^{-1}$ of data: the double-differential production cross section with respect to the transverse momentum and rapidity of the J/$\psi $, and the ratio of J/$\psi $ mesons produced from b-hadron decays to the J/$\psi $ produced promptly with respect to the J/$\psi $ transverse momentum. [Preview Abstract] |
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