Bulletin of the American Physical Society
75th Annual Meeting of the Southeastern Section of APS
Volume 53, Number 13
Thursday–Saturday, October 30–November 1 2008; Raleigh, North Carolina
Session CB: Particle Physics: Large Hadron Collider |
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Chair: Brad Cox, University of Virginia Room: Holiday Inn Brownstone Washington |
Thursday, October 30, 2008 10:45AM - 11:15AM |
CB.00001: The ATLAS Experiment at the CERN Large Hadron Collider Invited Speaker: This year marks the culmination of the two decades of design and construction required to bring the Large Hadron Colllider (LHC) and associated experiments into operation. The LHC will provide proton-proton collisions at energies far higher than other accelerators. Six experiments have been constructed to detect the particles produced from these proton-proton collisions, and these experiments will investigate the structure of matter at a new level of sensitivity. In this talk I will describe the detector referred to as ATLAS and summarize its measurement capabilities. I will then review the potential of the ATLAS experiment for discovering new types of matter and additional forces beyond those described by the Standard Model of elementary particle physics. [Preview Abstract] |
Thursday, October 30, 2008 11:15AM - 11:45AM |
CB.00002: The Status and Prospects of the CMS Experiment at the LHC Invited Speaker: The start-up of the Large Hadron Collider (LHC) this autumn opens a window onto physics at the TeV energy scale, allowing for studies on the nature of electroweak symmetry breaking and possibly the discovery of new particles and symmetries. A popular extension of the Standard Model of particle physics is Supersymmetry, which proposes an entire new family of particles with opposite spin statistics to the known particles; but other proposals to solve some of the fine-tuning and ad hoc ingredients to the Standard Model include new gauge interactions and extra spatial dimensions. The LHC will provide proton-proton collisions at a center-of-mass energy of 10 TeV in 2008, and 14 TeV thereafter. The Compact Muon Solenoid (CMS) experiment is a general-purpose experiment with excellent particle identification capability that is able to capitalize on the rich physics program of the LHC. The installation of all major detector components is complete, and an extensive commissioning program with cosmic ray muons has taken place over the last year and will continue with first LHC beams. This report will review the current status of the experiment, the performance of its detectors, and the status and prospects for measurements and discoveries in the first year of LHC operations. [Preview Abstract] |
Thursday, October 30, 2008 11:45AM - 12:15PM |
CB.00003: The ALICE Experiment at CERN Invited Speaker: The ALICE Experiment at the CERN Large Hadron Collider (LHC) is commencing a comprehensive program of measurements of high energy nucleus + nucleus collisions in order to extend our understanding of QCD and the novel properties of nuclear matter under extreme conditions. ALICE is the dedicated general purpose heavy ion experiment at the LHC which will measure the properties of the hot, dense nuclear matter produced in $Pb+Pb$ collisions at $\sqrt{s_ {NN}} = 5.5$ TeV, $p+p$ collisions at $\sqrt{s} = 14$ TeV, and other collision systems. We describe the rich ALICE program of physics objectives and future prospects, discuss the status of this year's inaugural run with $p+p$ collisions at $\sqrt{s} = 10$ TeV, and discuss key aspects of the detector design including those experimental contributions from institutes associated with the APS Southeastern Section. [Preview Abstract] |
Thursday, October 30, 2008 12:15PM - 12:27PM |
CB.00004: Performance of the Level-1 Muon Trigger for the CMS Endcap Muon System with Cosmic Rays and First LHC Beams Joseph Gartner We report on the performance of the level-1 muon trigger for the cathode strip chambers (CSCs) comprising the endcaps of the Compact Muon Solenoid (CMS) experiment. CMS is a general-purpose experiment designed to capitalize on the rich physics program of the Large Hadron Collider (LHC), which begins operation this autumn and which opens a window onto physics at the TeV energy scale. After many years of preparation, the CMS detectors and electronics have undergone a series of commissioning exercises involving the triggering and data acquisition of signals induced from cosmic ray muons, and most recently, first LHC beams. Here we report on the successful synchronization of signals from the 468 CSCs in the level-1 trigger path, and the successful triggering of the experiment based on those signals. The triggers that are provided by a specially built set of ``Track-Finder'' processors include triggers based on single CSC segments, tracks based on a coincidence of segments along a predefined road emanating from the beam collision point, and tracks parallel to the beam line that accept accelerator-induced halo muons. Evidence of the proper functioning of these triggers will be reported. [Preview Abstract] |
Thursday, October 30, 2008 12:27PM - 12:39PM |
CB.00005: Spatial Reconstruction of Co-60 Radiation Sources Using Goodness-of-Fit Tests on Spectra Obtained from an HPGe Detector Lenny Evans HPGe detectors are used in numerous low background assay systems, including the MAJORANA experiment, and spatial reconstruction of radiation sources could be used to locate unwanted backgrounds. The effect of the position of a Co-60 point source on the shape of spectra was observed in both Monte Carlo and HPGe detector measurements. Spectra taken with the radiation source placed at points on the face and side of the detector were compared in peak areas and were compared using the Kolmogorov-Smirnov goodness-of-fit test. We will discuss the position reconstruction accuracy of this statistical method. [Preview Abstract] |
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