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 FC: Collider Physics II |
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Chair: Dmitrii Bourilikov, University of Florida Room: Hilton Azalea |
Friday, November 11, 2005 8:30AM - 8:42AM |
FC.00001: Missing Transverse Energy Reconstruction and Correction in CMS Haifeng Pi, Paul Avery This paper summarizes the performance of basic missing transverse energy (MET) reconstruction and its correction techniques in Compact Muon Solenoid (CMS) experiment of Large Hadron Collider (LHC). Results of inclusive MET spectrum and resolution, high level trigger (HLT), factorization model, online and offline correction strategies and detector effects that influence MET quantities are presented. The design goal of MET will be satisfied to provide critical identification of the physics signature for precision measurement of standard model and discovery of new physics. [Preview Abstract] |
Friday, November 11, 2005 8:42AM - 8:54AM |
FC.00002: Sensitivity of the CMS detector to detecting Supersymmetry in the same sign di-muon signature Yuriy Pakhotin The possibility of discovering Supersymmetry (SUSY) with the CMS detector by studying the same-sign di-muon signature in the final state is analyzed. Full simulation and reconstruction of the SUSY signal events (generated in the mSUGRA model) and of the Standard Model (SM) background is performed. The expected CMS Muon system performance is discussed. It is shown that an excess of SUSY events over SM background is significant in a large area of mSUGRA parameter space even at low integrated luminosity. [Preview Abstract] |
Friday, November 11, 2005 8:54AM - 9:06AM |
FC.00003: Overview and Expected Performance of Calorimetry in the CMS Experiment Michael Schmitt In 2007, the Large Hadron Collider (LHC) will circulate and collide proton-proton beams at an expected sqrt(s) = 14 TeV. The Compact Muon Solenoid (CMS) is one of four multi-purpose experiments at the LHC and has been designed to discover a wide range of possible new physics. Calorimetry represents a crucial component of this goal and CMS correspondingly contains a highly granular lead-tungstate crystal electromagnetic calorimeter, providing excellent energy resolution, together with a brass-scintillator tile hadronic calorimeter providing good hermetical coverage. This talk briefly outlines the current status of the calorimeters in CMS and provides an overview of their expected performance from testbeam data and full Monte Carlo simulations. [Preview Abstract] |
Friday, November 11, 2005 9:06AM - 9:18AM |
FC.00004: Preparations for Inclusive Searches for Supersymmetry in the Leptons plus Jets and Missing Transverse Energy Topology using the CMS Detector Bobby Scurlock Preparations are underway to search for possible signatures of Supersymmetry (SUSY) in the leptons plus jets and missing transverse energy (MET) topology using the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider. This talk reports on the expected performance of reconstructing Jets (and MET), using a full simulation of the CMS detector, and studies the effects on inclusive SUSY searches. The primary background sources to SUSY are expected to arise from QCD, top anti-top, and W/Z production. Strategies for reducing this background, both from the online CMS trigger and from offline data analysis, are presented. [Preview Abstract] |
Friday, November 11, 2005 9:18AM - 9:30AM |
FC.00005: Performance of an Electronic Track-Finding Processor for the Level-1 Muon Trigger of the CMS Experiment Khristian Kotov We report on the performance of an electronic track-finding processor that reconstructs in real-time 3-D tracks in the Cathode Strip Chambers (CSCs) of the Compact Muon Solenoid (CMS) experiment which is currently under construction at the Large Hadron Collider (LHC). This processor forms part of the Level-1 muon trigger of CMS, which identifies proton collisions using custom electronics for further analysis by an online computer cluster while reducing the event rate from 40 MHz to 100 kHz. The track-finding processor is implemented using field-programmable gate-arrays and SRAM look-up tables. A pre-production prototype was included into the trigger path during a series of tests at CERN where dedicated CSCs were exposed to an LHC time-structured muon beam and where CSCs installed on the CMS endcap disks were exposed to cosmic-rays. Final production of the system is now complete and all modules have passed system tests. An overview of the Level-1 trigger system and results on the efficiency, time structure, and data validation of the track-finding processor are reported. [Preview Abstract] |
Friday, November 11, 2005 9:30AM - 9:42AM |
FC.00006: Top mass measurement in the all-hadronic channel Gheorghe Lungu We present here a preliminary measurement of the top quark mass in the all-jet final state, where both W's decay hadronically. The measurement is performed using $p\bar p$ collision data at sqrt(s) =1.96 TeV at the Collider Detector at Fermilab. The method employed uses matrix element information to weigh each event configuration according to the probability for it to originate from ttbar production and decay at a given top mass. All the event probabilities are multiplied to yield a total likelihood which depends on the top mass. The estimated mass is the value at which the total likelihood is minimized. [Preview Abstract] |
Friday, November 11, 2005 9:42AM - 9:54AM |
FC.00007: From the Standard Model to Discoveries - Physics with the CMS Experiment at the Dawn of the LHC Era Dimitri Bourilkov The preparations of the CMS collaboration for first data taking, when the Large Hadron Collider (LHC), located close to Geneva, Switzerland, starts to circulate and collide proton-proton beams at center-of-mass energies around 14 TeV in 2007, are presented. This new and unexplored energy domain will provide unique opportunities to search for new physics at the TeV scale, a preferred region for many extensions of the Standard Model. The status of the CMS detector and the possible impact of staging on the physics program are presented, followed by a description of the main data samples and their use for alignment and calibration. Selected search channels and signatures for Higgs bosons, Supersymmetry, Extra dimensions and Contact interactions will be discussed. [Preview Abstract] |
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