Bulletin of the American Physical Society
Fall 2009 Meeting of the Four Corners Section of the APS
Volume 54, Number 14
Friday–Saturday, October 23–24, 2009; Golden, Colorado
Session H8: Particles, Fields and Beams |
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Chair: John Cumalat, University of Colorado at Boulder Room: Hill Hall 209 |
Saturday, October 24, 2009 11:20AM - 11:32AM |
H8.00001: $\rho-\phi$ Relative Production Phase Using Dimuons Valeria Frisullo, John Cumalat The $\rho-\phi$ production phase is determined using a sample of quasielastically photoproduced $\mu^{+}\mu^{-}$ events obtained in the FOCUS experiment at Fermi National Accelerator Laboratory. The measurement is accomplished by correcting for the Bethe-Heitler dimuon production and by fitting for interference between the $\rho \rightarrow \mu^{+}\mu^{-}$ and $\phi \rightarrow \mu^{+}\mu^{-}$ final states. This result represents the first direct measurement of the $\rho-\phi$ production phase. A preliminary study of the $\omega \rightarrow \mu^{+} \mu^{-}\pi^{0}$ decay channel is also presented. [Preview Abstract] |
Saturday, October 24, 2009 11:32AM - 11:44AM |
H8.00002: A study of early data $B$-physics at CMS Brian R. Drell, Kevin Stenson, Keith A. Ulmer We present plans for the reconstruction of three $b$-hadron decay modes: $B^{0} \rightarrow K^0_S J/\psi$, $B^+ \rightarrow K^{*+}(K^0_S \pi^+) J/\psi$, and $\Lambda^0_b\rightarrow \Lambda^0 J/\psi$ with dimuon final states in early data from the CMS detector at the LHC. Our analysis will include measurements of lifetimes and transverse momentum differential cross sections. Techniques used in analysis of these decay modes will eventually be used for reconstruction of rare $b$ decay modes with similar topology once the LHC reaches higher integrated luminosity. [Preview Abstract] |
Saturday, October 24, 2009 11:44AM - 11:56AM |
H8.00003: Using Diamond Sensors to Track Charged Particles John Cumalat, Kevin Stenson, Stephen Wagner Reverse biased silicon sensors are currently the instrument of choice for tracking charged particles in high energy experiments. Exposure to high intensity radiation causes silicon sensors to deteriorate and they will need to be replaced. Diamond has a much higher radiation tolerance than silicon. In addition, diamond is mechanically hard, has a high thermal conductivity and a fast signal collection time. We are conducting research on the use of polycrystalline Chemical Vapor Deposition (pCVD) diamond sensors as a possible choice for an inner Large Hadron Collider pixel tracking detector. We will report on our recent diamond measurements. [Preview Abstract] |
Saturday, October 24, 2009 11:56AM - 12:08PM |
H8.00004: Supersymmetry Simulation in the Large Hadron Collider Will Flanagan, Uriel Nauenberg, Shi-Lei Zang, Bernadette Heyburn Our group is investigating possible tests of supersymmetry at the Large Hadron Collider at CERN. More specifically, we are studying supersymmetry with electromagnetic events at the Compact Muon Solenoid. We are using supersymmetry with gauge-mediated symmetry breaking (GMSB). Our analysis is focused on Monte Carlo simulation of such events in order to prescribe ``observables'' for when the LHC becomes operational later this year. We will present some of our preliminary results as well as some exciting prospects for our future work. [Preview Abstract] |
Saturday, October 24, 2009 12:08PM - 12:20PM |
H8.00005: Exclusive decays of $\chi_{bJ}$ and $\eta_b$ into two charmed mesons Emanuele Mereghetti, Regina Azevedo, Long Bingwei We develop a framework to study the exclusive two-body decays of bottomonium into two charmed mesons and apply it to study the decays of the $C$-even bottomonia. Using a sequence of effective field theories, we take advantage of the separation between the scales contributing to the decay processes, $2m_b \gg m_c \gg \Lambda_{QCD}$. We prove that, at leading order in the EFT power counting, the decay rate factorizes into the convolution of two perturbative matching coefficients and three non-perturbative matrix elements, one for each hadron. We calculate the relations between the decay rate and non- perturbative bottomonium and $D$-meson matrix elements at leading order, with next-to-leading log resummation. The phenomenological implications of these relations are discussed. [Preview Abstract] |
Saturday, October 24, 2009 12:20PM - 12:32PM |
H8.00006: The Inert Dark Matter Ethan Dolle, Shufang Su The lightest neutral scalar in the Inert Higgs Doublet Model is a natural candidate for WIMP dark matter. In this paper, we analyzed the dark matter relic density in the Inert Higgs Doublet model. Various theoretical and experimental constraints are taken into account. We found that there are five distinctive regions that could provide the right amount of the relic density in the Universe. Four out of those five regions have a light particle spectrum which could be studied at the Large Hadron Collider. [Preview Abstract] |
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