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Time Reconstruction and Performance of the CMS Electromagnetic Calorimeter

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  • Astronomy
  • Physics


This content has been downloaded from IOPscience. Please scroll down to see the full text. Download details: IP Address: This content was downloaded on 13/02/2014 at 18:19 Please note that terms and conditions apply. Time reconstruction and performance of the CMS electromagnetic calorimeter View the table of contents for this issue, or go to the journal homepage for more 2010 JINST 5 T03011 ( Home Search Collections Journals About Contact us My IOPscience 2010 JINST 5 T03011 PUBLISHED BY IOP PUBLISHING FOR SISSA RECEIVED: November 23, 2009 ACCEPTED: January 5, 2010 PUBLISHED: March 19, 2010 COMMISSIONING OF THE CMS EXPERIMENT WITH COSMIC RAYS Time reconstruction and performance of the CMS electromagnetic calorimeter CMS Collaboration ABSTRACT: The resolution and the linearity of time measurements made with the CMS electro- magnetic calorimeter are studied with samples of data from test beam electrons, cosmic rays, and beam-produced muons. The resulting time resolution measured by lead tungstate crystals is bet- ter than 100 ps for energy deposits larger than 10 GeV. Crystal-to-crystal synchronization with a precision of 500 ps is performed using muons produced with the first LHC beams in 2008. KEYWORDS: Calorimeters; Large detector systems for particle and astroparticle physics ARXIV EPRINT: 0911.4044 c© 2010 IOP Publishing Ltd and SISSA doi:10.1088/1748-0221/5/03/T03011 2010 JINST 5 T03011 Contents 1 Introduction 1 2 Time extraction with ECAL crystals 2 3 Time measurement resolution 4 4 Synchronization between crystals 5 5 Resolution and linearity checks using cosmic ray muons 8 6 Conclusions 9 The CMS collaboration 11 1 Introduction The primary goal of the Compact Muon Solenoid (CMS) experiment [1] is to explore particle physics at the TeV energy scale, exploiting the proton-proton collisions delivered by the Large Hadron Collider (LHC) at CERN [2

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