Bulletin of the American Physical Society
76th Annual Meeting of the Southeastern Section of APS
Volume 54, Number 16
Wednesday–Saturday, November 11–14, 2009; Atlanta, Georgia
Session BC: High Energy Physics |
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Chair: Xiaochun He, Georgia State University Room: Paris |
Thursday, November 12, 2009 8:30AM - 8:42AM |
BC.00001: A Technique for the Measurement of Tracking Efficiency Ryan White, Milind Purohit We present a method of obtaining tracking efficiency and asymmetry, as a function of lab momentum, using decays of tau leptons. The method obtains the efficiency and asymmetry directly from data. Background distributions are determined from Monte Carlo. We report on the results of a 2-dimensional binned $\chi^{2}$ fit to data recorded at the BaBar detector. [Preview Abstract] |
Thursday, November 12, 2009 8:42AM - 8:54AM |
BC.00002: A study of form-factors in $D^0\to K_S \pi^- e^+ \nu_e$ decays Hongxuan Liu, Milind Purohit We use 429 fb$^{-1}$ of data recorded by the BaBar detector at the PEP-II electron-positron collider to study the $D^0\to K_S \pi^- e^+ \nu_e$ decay channel. We fit the data to a 5-dimensional distribution of the decay quantities $q^2$, $\cos\theta_V$, $\cos\theta_\ell$, $\chi$ and $m_{K_S\pi}$ and present preliminary measurements of the decay amplitude and the Branching Fraction. [Preview Abstract] |
Thursday, November 12, 2009 8:54AM - 9:06AM |
BC.00003: Daya Bay Reactor Neutrino Experiment YuenKeung Hor The Daya Bay reactor neutrino experiment, currently under construction in China, will be the most sensitive experiments in the world searching for the yet unknown neutrino mixing parameters, theta-13($\theta _{13})$.~ With a thermal power of 17.4GW by 2011, the Daya Bay site provides an intense electron antineutrino flux, which together with 3 years of data taking from 4 pairs of identical detectors at far and near locations, optimized baseline with large rock overburden and active water shielding, up to 80 tons total target mass comprising Gd-doped liquid scintillator and comprehensive, redundant calibration measures, will lower the upper bound on sin$^{2}$2$\theta _{13}$ to 0.01 or better. [Preview Abstract] |
Thursday, November 12, 2009 9:06AM - 9:18AM |
BC.00004: Search for the SM Higgs in semi-leptonic WW* decays at Dzero Shannon Zelitch, Marc Buehler, Bob Hirosky, Lidija Zivkovic, Gustaaf Brooijmans We present a search for the Standard Model Higgs boson produced via the~$H\rightarrow WW^{*} \rightarrow l \bar\nu jj$ process at a center-of-mass energy of $\sqrt{s}=1.96$ TeV using up to $5~fb^{-1}$ of data collected with the D\O~ detector at the Fermilab Tevatron collider. We search in events with one lepton (electron or muon), two jets and missing transverse energy. A Higgs particle with a mass greater than 140 GeV primarily decays into a pair of W bosons. While the di-lepton channels provide a cleaner signature, the semi-leptonic decay mode has a significantly larger cross section $\times$ branching ratio. Procedures used to identify signal-like events and to overcome the large W+jets background will be discussed. [Preview Abstract] |
Thursday, November 12, 2009 9:18AM - 9:30AM |
BC.00005: Cosmic Ray Neutron Flux Measurements Mathes Dayananda Cosmic rays are high-energetic particles originating from outer space that bombard the upper atmosphere of the Earth. Almost 90{\%} of cosmic ray particles consist of protons, electrons and heavy ions. When these particles hit the Earth's atmosphere, cascade of secondary particles are formed. The most abundant particles reach to the surface of the Earth are muons, electrons and neutrons. In recent years many research groups are looking into potential applications of the effects of cosmic ray radiation at the surface of the Earth [1, 2]. At Georgia State University we are working on a long-term measurement of cosmic ray flux distribution. This study includes the simultaneous measurement of cosmic ray muons, neutrons and gamma particles at the Earth surface in downtown Atlanta. The initial effort is focusing on the correlation studies of the cosmic ray particle flux distribution and the atmospheric weather conditions. In this presentation, I will talk about the development of a cosmic ray detector using liquid scintillator and the preliminary results. \\[4pt] [1] K.Borozdin, G.Hogan, C.Morris, W.Priedhorsky, A.Saunders, L.Shultz, M.Teasdale, ``Radiographic imaging with cosmic-ray muons'', Nature, Vol.422, p.277, Mar.2003\\[0pt] [2] Svensmark Henrik, Physical Review 81, 3, (1998) [Preview Abstract] |
Thursday, November 12, 2009 9:30AM - 9:42AM |
BC.00006: Some recent results in the phenomenology of neutrino osciallations David Ernst, Jesus Escamilla-Roa, David Latimer As the phenomenology of neutrino oscillations enters a new era of precision data, analysis must be mindful of small effects, such as linear terms in the mixing angle $\theta_{13}$. The existence of these terms invalidates analyses done in terms of the square of this mixing angle and gives rise to the question of what is the sign of the angle, not just is its value non-zero. Results from a recent analysis of the world's data which uses exact oscillation probability formulae will be presented, with a focus on the role of the linear in $\theta_{13}$ terms in determining this angle and in discriminating between the two hierarchies. [Preview Abstract] |
Thursday, November 12, 2009 9:42AM - 9:54AM |
BC.00007: Status and Operational Experience with the CDF Run II Silicon Detector Margaret Jezghani, Sergo Jindariani, Satyajit Behari, Sebastian Carron The CDF Run II silicon detector is the largest operating silicon detector in High Energy Physics. Its 722,000 channels spread over 7 $m^{2}$ of silicon micro-strip sensors allow precision tracking and vertexing. The CDF silicon detector played a critical role in the discovery of Bs mixing and is used extensively for the current Higgs Boson searches. Over the last 7 years, the detector ef?ciency has remained stable at 95\% after the Run II commissioning period. The infrastructure (cooling, power supplies) problems dealt with and actions taken are discussed, with the emphasis on work during Summer 2009 shutdown. [Preview Abstract] |
Thursday, November 12, 2009 9:54AM - 10:06AM |
BC.00008: Design and Implementation of a GRID Simulator William Boyd, Martin Barisits, Mario Lassnig As the LHC begins operation, CERN will soon become one the of the planet's largest data-producing entities. To manage and process the data produced at CERN, a worldwide cloud computing network called the GRID has been constructed. Presently, data distribution from CERN across the GRID is largely static. There is a need to optimize data distribution across the GRID through dynamic data algorithms that can evolve according to past and present conditions on the GRID. In order to evaluate such data allocation algorithms, it is necessary to test them within a simulation environment before employing them across the GRID. In this presentation, the development strategy, implementation and features of the first GRID simulator, MartinWillSim, will be discussed. In addition, results which validate the simulator against the present-day GRID, as well as results from some dynamic data allocation algorithms implemented in MartinWillSim, will be presented. [Preview Abstract] |
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