Bulletin of the American Physical Society
2006 Texas Section of the APS Joint Fall Meeting
Thursday–Saturday, October 5–7, 2006; Arlington, Texas
Session HEP1: High-Energy Physics I |
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Chair: Joe Izen, University of Texas at Dallas Room: UT Arlington, University Center Guadalupe |
Friday, October 6, 2006 10:30AM - 10:42AM |
HEP1.00001: Is there a fourth neutrino? David Ernst, Jesus Escamilla, David Latimer The phenomena of neutrino oscillations will be reviewed. A brief overview of the world’s data, neutrinos originating from the sun, from cosmic rays, from beam stops, and from reactors, will be given. A global analysis of the total of the data will be given in the context of three active neutrinos and in the context of three active plus one sterile neutrino. The analysis is performed utilizing the full mixing without expanding into sub-oscillations. This allows parameters to vary in a highly correlated way and hence produces results that are different from previous analyses. In particular, we find that the atmospheric neutrino data prefer a fourth neutrino. With this additional support for the existence of a fourth neutrino, we find that present data indicate the existence of the fourth neutrino at several specific masses. If results from Mini-Boone are available, the abstract and talk will be updated to incorporate these. [Preview Abstract] |
Friday, October 6, 2006 10:42AM - 10:54AM |
HEP1.00002: SUSY Searches in the Bulk Region of mSUGRA plane with ATLAS Detector Dipanjan Roy Supersymmetry (SUSY) is one of the most promising extensions of the Standard Model. SUSY will be explored in the ATLAS experiment at the Large Hadron Collider at CERN, which is scheduled to start in 2007. Search techniques for SUSY are discussed in detail using an example point in the bulk region of the mSUGRA plane. Inclusive and exclusive signatures are explored with fully simulated Monte Carlo data. [Preview Abstract] |
Friday, October 6, 2006 10:54AM - 11:06AM |
HEP1.00003: Comparison of 2006 CMS HCAL Test Beam Data and GEANT4 Simulation Chiyoung Jeong, Sung-Won Lee, Nural Akchurin The 2006 test beam data of the combined CMS electromagnetic and hadron calorimeter modules is compared with GEANT4 simulation. Detailed comparison have been carried on linearity, e/h ratio, energy resolution and longitudinal shower profiles between the test beam data with electron and pion beams at different energies and GEANT4 simulation of the associated test beam geometry setup. [Preview Abstract] |
Friday, October 6, 2006 11:06AM - 11:18AM |
HEP1.00004: Search for the Higgs Particle and Electron ID Using H-Matrix at ATLAS Hyeon Jin Kim, Jaehoon Yu A good final state for the search for the Standard Model Higgs involves the decay of the Higgs particle to two Z bosons which then subsequently decays to electrons, resulting in four electrons when the mass of the Higgs is greater than 130GeV/c2. In order to increase the efficiency of selecting the Higgs particles, it is critical to develop a high efficiency electron identification tool. In this talk, we present the electron identification algorithm based on the covariant matrix technique which was successfully used in the D0 experiment at the Tevatron. We will then present the performance of the currently developed 5 and 10 dimensional covariant matrices for electrons and photons have been constructed with a set of variables describing the electron and photon shower shape. Good event selection efficiency for H $\diamondsuit $ 4e and H $\diamondsuit \quad \gamma \gamma $ final states have been observed. [Preview Abstract] |
Friday, October 6, 2006 11:18AM - 11:30AM |
HEP1.00005: Exponentiated Monte-Carlo Approach to Vector Boson Production at the LHC Scott Yost We describe a non-abelian exponentiation approach to constructing a Monte Carlo generator for vector boson production at the LHC. The approach is motivated by the Yennie-Frautschi-Suura exponentiation in abelian gauge theory, but with essential modifications as needed for application to QCD and QED together. We discuss approaches to matching the hard parton cross section to the shower, and give an estimate of the size of the QED contributions, showing the importance of including them to reach the desired precision level in LHC physics. [Preview Abstract] |
Friday, October 6, 2006 11:30AM - 11:42AM |
HEP1.00006: FP420, a New Proton Detector for the LHC Andrew Brandt Plans for a proposed upgrade that adds proton taggers 420 m upstream and downstream of the ATLAS and CMS detectors will be presented. These new detectors will add significantly to the discovery potential. The design features ultra-fast time-of-flight counters which could be used to dramatically decrease backgrounds to events with a massive central system and forward/backward protons, by using timing to confirm that the protons originate from the same event vertex as the central system. [Preview Abstract] |
Friday, October 6, 2006 11:42AM - 11:54AM |
HEP1.00007: Dynamical and Geometrical Aspects of Isoscaling Christian Escudero, Claudio Dorso, Alan Davila, M. Ison, Jorge L\'opez Isoscaling is studied using classical molecular dynamics simulations of several reactions at various energies. Isoscaling at different stages of the reaction was calculated and the validity of the isoscaling power law was estimated. In addition we study the property of isoscaling from a 3D bond two colors polychromatic percolation model. We shown analytically the existence of isoscaling in such systems, and compare the analytical results with numerical data of some percolations systems. [Preview Abstract] |
Friday, October 6, 2006 11:54AM - 12:06PM |
HEP1.00008: Search for Heavy, Long-Lived Particles that Decay to Photons at CDF Eunsin Lee, Max Goncharov, David Toback, Peter Wagner, Vyacheslav Krutelyov Models of supersymmetry predict new heavy, long-lived particles, known as a neutralino, that can decay to a photon and a gravitino. We present a search for these particles in proton anti-proton collisions at $\surd $s = 1.96 TeV using a new timing device on the Collider Detector at Fermilab. After a year of data taking we find no evidence for this process, and set limits on models of Gauge Mediated Supersymmetry Breaking. [Preview Abstract] |
Friday, October 6, 2006 12:06PM - 12:18PM |
HEP1.00009: SUSY Studies with ATLAS Experiment Nurcan Ozturk The Large Hadron Collider (LHC) is a 14-TeV proton-proton collider which is scheduled to start taking data in 2007 at CERN in Switzerland. The ATLAS experiment at the LHC will search for Supersymmetry (SUSY) which is one of the most attractive extensions of the Standard Model. SUSY discovery potential of the ATLAS experiment within the mSUGRA framework is presented. Recent studies using full simulation of the detector to measure properties of SUSY particles are discussed. Data Challenge activities that aim to provide simulated data to optimize the detector and to validate the ATLAS Computing Model will be described. [Preview Abstract] |
Friday, October 6, 2006 12:18PM - 12:30PM |
HEP1.00010: Integration constraints on a future high Pt muon trigger for PHENIX at RHIC Daniel Jumper The PHENIX experiment is a large-scale, complex detector system stationed at the RHIC accelerator ring. One of PHENIX's goals is to understand the long obscured contributing factors of the protons' spin structure. This is accomplished by studying the muon decay of W bosons produced by quark-anti quark interaction in polarized proton-proton collisions. A trigger upgrade of Resistive Plate Chambers (RPCs), currently funded for PHENIX, will significantly enhance the ability to trigger on muons at high Pt, where they are more prevalent than other signal sources. By triggering in this manner, the rejection factor of undesired sources is greatly increased, bringing the previously unmanageable rate of data acquisition within practical ranges. The RPCs, however, fall under serious design limitations due to integration constraints of experiment complexity leaving extremely limited space for the chambers, their support systems, and installation. Although these restrictions are far from trivial, careful designs and integration plans have been implemented that overcome them and will bring this spin study to a practical reality. [Preview Abstract] |
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