Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 46, Issue -, Pages 45-56Publisher
SPRINGER
DOI: 10.1140/epjcd/s2006-02-004-8
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- CMS HCAL/JetMET working group
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The performance of the Compact Muon Solenoid detector for measuring missing transverse energy is evaluated using fully simulated pp collisions at a center-of-mass energy of 14 TeV at the Large Hadron Collider. For minimum bias events without pileup, a resolution of 6.1 GeV is computed, corresponding to a stochastic contribution of 0.63 root Sigma ETGeV1/2, where Sigma E-T is the summed transverse energy in all calorimeter towers. When the contribution of pileup is included, the resolution degrades according to the overall deposited Sigma E-T with the same stochastic coefficient. For QCD dijet events with event pileup corresponding to a luminosity L = 2x10(33) cm(-2)s(-1), we compute sigma = [(3.8 GeV)(2) + (0.97 GeV1/2 root Sigma E-T)(2) + (0.012 Sigma E-T)(2)](1/2) resulting in a resolution of 45 GeV for jet events with reconstructed transverse momentum of 800 GeV/c. Monte Carlo samples of t (t) over bar and W+ jet events with high-momentum (p(T) > 20 GeV/c) lepton decays leading to true missing transverse energy were used to determine the azimuthal angle resolution to be 0.1 radians (0.2 radians) for a reconstructed missing transverse energy of 200 GeV (100 GeV).
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