Bulletin of the American Physical Society
2005 72nd Annual Meeting of the Southeastern Section of the APS
Thursday–Saturday, November 10–12, 2005; Gainesville, FL
Session EC: Collider Physics I |
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Chair: Howard Baer, Florida State University Room: Hilton Azalea |
Thursday, November 10, 2005 4:15PM - 4:27PM |
EC.00001: Analysis of the Laser Calibration System for the CMS HCAL at CERN's Large Hadron Collider Luis Lebolo, Vanessa Gaultney, Laird Kramer, Stephan Linn, Pete Markowitz The European Organization for Nuclear Physics' (CERN) Large Hadron Collider uses the Compact Muon Solenoid (CMS) detector to measure collision products from proton-proton interactions. CMS uses a hadron calorimeter (HCAL) to measure the energy and position of quarks and gluons by reconstructing their hadronic decay products. An essential component of the detector is the calibration system, which was evaluated in terms of its misalignment, linearity, and resolution. In order to analyze the data, the authors created scripts in ROOT 5.02/00 and C++. The authors also used Mathematica{\textregistered} 5.1 to perform complex mathematics and AutoCAD{\textregistered} 2006 to produce optical ray traces. The misalignment of the optical components was found to be satisfactory; the Hybrid Photodiodes (HPDs) were confirmed to be linear; the \textit{constant}, \textit{noise} and \textit{stochastic} contributions to its resolution were analyzed; and the quantum efficiency of most HPDs was determined to be approximately 40{\%}. With a better understanding of the laser calibration system, one can further understand and improve the HCAL. [Preview Abstract] |
Thursday, November 10, 2005 4:27PM - 4:39PM |
EC.00002: Search for Large Extra Dimensions in the Single Photon and Missing Energy Channel at D0 Jose Lazoflores The photon and missing energy signal has a small standard model cross-section and is thus a good channel in which to search for new physics. The single photon and graviton production signal can be computed using models with large extra dimensions. We are searching for such a signal at the D0 detector at the Tevatron, using 240 inverse picobarns of data at 1.96 TeV center of mass energy. [Preview Abstract] |
Thursday, November 10, 2005 4:39PM - 4:51PM |
EC.00003: Distinguishing supersymmetry and extra dimensions at the LHC Kyoungchul Kong, Konstantin Matchev, Asesh Datta One of the defining features of supersymmetry is that the spins of the superpartners differ by $1/2$ unit from their Standard Model counterparts. In order to prove a discovery of supersymmetry at the LHC, one would therefore have to measure the spins of the superpartners. This is important since a class of models with $TeV$ size extra dimensions (known as Universal Extra Dimensions) have identical collider signatures, and the only difference from supersymmetry is that the spins of the Kaluza-Klein particles are the same as their partners in the Standard Model. We describe several methods for spin determinations of the superpartners at the LHC and discuss to what extent supersymmetry can be distinguished from a model with Universal Extra Dimensions. [Preview Abstract] |
Thursday, November 10, 2005 4:51PM - 5:03PM |
EC.00004: Precision studies of supersymmetry at the LHC Craig Group, Konstantin Matchev, Andreas Birkedal If low energy supersymmetry is realized at the weak scale, the Large Hadron Collider at CERN will discover it. The signals will be quite complex, since the superpartners are being produced all at the same time, and they decay through various rather complicated decay chains. We develop several methods for precision measurements allowing extraction of supersymmetry parameters at the LHC in a model independent fashion. [Preview Abstract] |
Thursday, November 10, 2005 5:03PM - 5:15PM |
EC.00005: Two-particle momentum correlations in jets at Tevatron Sergo Jindariani, Andrey Korytov, Alexandre Pronko Presented are the measurements of two-particle momentum correlations in jets produced in p-pbar collisions at center of mass frame energy 1.96 TeV. Studies were performed for charged particles within restricted opening angle of 0.5 rad around the jet axis and for dijet events with various dijet masses. Comparison of the experimental results to the theoretical predictions obtained for partons within the framework of the resummed perturbative QCD (Next-to-Leading Log Approximation) shows that the parton momentum correlations do survive the hadronization stage of jet fragmentation, thus, giving further support to the hypothesis of Local Parton-Hadron Duality. [Preview Abstract] |
Thursday, November 10, 2005 5:15PM - 5:27PM |
EC.00006: Search for Top-Antitop pairs production via a Non-Standard Model resonance Valentin Necula, Roberto Rossin, Jacobo Konigsberg We examine the invariant mass spectrum of top-antitop pairs in the Run 2 CDF data from $p\bar{p}$ collisions at Tevatron. We search for non-standard model resonance states in the lepton+jets final state channel. We use an event reconstruction technique that uses production and decay information to increase the sensitivity for discovery. [Preview Abstract] |
Thursday, November 10, 2005 5:27PM - 5:39PM |
EC.00007: Precision calculation in QCD for production of a W with two massive jets at hadron colliders Fernando Febres Cordero, Laura Reina, Doreen Wackeroth We present the NLO QCD corrections to the process $p{\bar p},pp\rightarrow Wb\bar b$ including full mass effects. This is an important background for several processes, in particular for the associated W production of a SM light Higgs. [Preview Abstract] |
Thursday, November 10, 2005 5:39PM - 5:51PM |
EC.00008: Measurement of $t\bar{t}$ production cross-section in all-hadronic channel Alexander Sukhanov, Jacobo Konigsberg, Gheorghe Lungu We present here the measurement of the $t\bar t$ production cross section in the all-hadronic channel, where both $W's$ decay hadronically. The analysis is performed using 311 pb$^{-1}$ of $p\bar p$ collisions collected with a multijet trigger at $\sqrt{s}=1.96$ GeV with the Collider Detector at Fermilab. After the application of an optimized kinematical selection we observe an excess of events with 6 or more jets, including one or more $b$ jets, relative to background expectations. Based on this excess we measure the production cross section $\sigma_{t\bar t}=7.5^{+3.7}_{-2.8}$ pb. [Preview Abstract] |
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