Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session S12: QCD Probes |
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Sponsoring Units: DPF Chair: Dmitri Denisov, Fermi National Accelerator Laboratory Room: Virginia A |
Monday, February 15, 2010 3:30PM - 3:42PM |
S12.00001: Electric Polarizability In Lattice QCD Michael Lujan, Frank Lee, Andrei Alexandru We study the electric polarizability of neutral and charged particles using lattice QCD techniques with standard Wilson fermions. The background field method is used for introducing the electric field onto the lattice. The calculations are carried out using quenched configurations with 6 different pion masses and 4 different fields. The polarizabilites are extracted from small mass shifts. The charged particles are more challenging than neutral particles because they accelerate in the electric field. We investigate several methods for isolating the signal for charged particles. The methods are checked by using test data generated from the known functional form of the two- point correlation function for charged scalar particles [1]. We will report results for a variety of mesons and baryons. \\[4pt] [1] W. Detmold, B.C. Tiburzi, A. Walker-Loud, Phys. Rev D79 094505 (2009) [Preview Abstract] |
Monday, February 15, 2010 3:42PM - 3:54PM |
S12.00002: Extraction of the $\rho$-meson Decay Width from Lattice QCD Craig Pelissier, Andrei Alexandru, Frank Lee We extract the $\rho$-meson decay width from the scattering phaseshifts in the I = 1 isospin channel. The phaseshifts are determined by extracting the low lying energy spectrum and using the formula proposed by L\"uscher which relates the energies to the scattering phaseshifts. Simulations are done in the quenched approximation with the standard Wilson action and a pion mass of 330 MeV. The functional form of the phaseshifts is taken from $\chi$PT and fitted to extract the resonance mass and width. [Preview Abstract] |
Monday, February 15, 2010 3:54PM - 4:06PM |
S12.00003: Measurement of Collins Asymmetries in the inclusive production of hadron pairs Isabella Garzia Transversity distribution, which describes the quark transverse polarisation inside a transversely polarised nucleon, is the last leading-twist missing piece of the QCD description of the partonic structure of the nucleon. Transversity can be extracted from semi-inclusive deep inelastic scattering data, where, however, it couples to a new, unknown fragmentation function, called Collins function. We present a measurement of the azimuthal asymmetries in the process $e^+e^- \to \pi \pi X$ (inclusive hadron production), in which the two pions are produced in opposite hemispheres, based on the full {\sl B{\scriptsize A}B{\scriptsize AR}} data sample. The Collins function is extracted from the measured asymmetries. [Preview Abstract] |
Monday, February 15, 2010 4:06PM - 4:18PM |
S12.00004: Measurement of $f_{D_s}$ Using $D_s^+\to \tau^+\nu$ and $\tau^+\to\rho^+\overline{\nu}$ Liming Zhang Using 600 pb$^{-1}$ of $e^+e^-$ collision data at center-of-mass energy 4170 MeV with the CLEO-c detector, we measured the branching fraction of $D_s^+\to \tau^+\nu$ using the $\tau^+\to \rho^+\overline{\nu}$ decay mode. We determined the pseudoscalar decay constant $f_{D_s}$ using this and the other measurements from CLEO-c and compared the result with the predictions of unquenched lattice QCD. We also present the first measurements of the branching fractions for $D_s^+\to K^0\pi^+\pi^0$, and $D_s^+\to\pi^+\pi^0\pi^0$, and a new measurement of the branching fraction for $D_s^+\to\eta\rho^+$. [Preview Abstract] |
Monday, February 15, 2010 4:18PM - 4:30PM |
S12.00005: Measurement of direct photon pair production cross sections at D0 Bjoern Penning We present a measurement of differential cross sections of direct photon pair production in $p\bar{p}$ collisions at sqrt(s) = 1.96 TeV as a function of di-photon mass, pT, azimuthal angle, and polar angle using 4.2 fb$^{-1}$ of the D0 Run II data. The results are compared with three theoretical predictions provided by RESBOS, DIPHOX and PYTHIA. [Preview Abstract] |
Monday, February 15, 2010 4:30PM - 4:42PM |
S12.00006: Double parton interactions in photon + 3 jets events in $p\bar{p}$ collisions at sqrt(s)=1.96 TeV Georgy Golovanov We have used a sample of photon+3 jets events collected by the D0 experiment with an integrated luminosity of about 1 fb$^{-1}$ to determine the fraction of events with hard double parton (DP) scattering in a single $p\bar{p}$ collision at sqrt(s)=1.96 TeV. The DP fraction and effective cross section, a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in pT) jet transverse momentum 15 - 30 GeV range. [Preview Abstract] |
Monday, February 15, 2010 4:42PM - 4:54PM |
S12.00007: Inclusive Photons at CMS Vanessa Gaultney, Stephan Linn, Vasundhara Chetluru, Vivian O'Dell, Serguei Ganjour, Nikos Varelas We present a study of inclusive photons using the CMS detector. High P$_{T}$ photons are a sensitive test of perturbative QCD and can help to constrain the gluon parton distribution function. A template method is used to discriminate the signal from QCD backgrounds, and systematic errors are estimated. [Preview Abstract] |
Monday, February 15, 2010 4:54PM - 5:06PM |
S12.00008: Anomalous Single Production of Charged Heavy Leptons at Future Linear Colliders Ahmet Tolga Tasci, Abdulkadir Senol We consider the possible discovery potential for single production of charged heavy leptons via anomalous interactions at future linear colliders ILC and CLIC by taking into account initial state radiation (ISR), beamstrahlung (BS) and detector smearing effects. We calculate the production cross sections and decay widths of charged heavy leptons in the context of anomalous interactions at center of mass energies $\sqrt{s}$=0.5 TeV (ILC), $\sqrt{s}$=1 and 3 TeV (CLIC). The signal and corresponding backgrounds are studied in detail for the mass range 300-900 GeV. [Preview Abstract] |
Monday, February 15, 2010 5:06PM - 5:18PM |
S12.00009: Measurement of $f_{D_s}$ in $D_s \rightarrow \mu \nu$ decays Aidan Randle-Conde We present a measurement of the branching fraction $BR(D_s \rightarrow \mu \nu)$ using the complete data-set (521 ${\rm fb}^{-1}$) collected by the {\sl B{\scriptsize A}B{\scriptsize AR}} detector at the PEP-II asymmetric-energy $B$ factory at SLAC. The $D_s$ yield is determined by a fit to the mass recoiling against reconstructed $D K X \gamma$ candidates in events of the type $e^+e^- \rightarrow D K X D_s^* $, where $D_s^* \rightarrow D_s \gamma$ and $X$ represents additional pions from fragmentation. The neutrino yield is determined using the mass recoiling against reconstructed $D K X \gamma \mu$ candidates. This full-reconstruction method provides high resolution in the neutrino mass and thus good background separation. [Preview Abstract] |
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