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√σETGeV1/2 where ∑ET is the summed transverse energy in all calorimeter towers. When the contribution of pileup is included the resolution degrades according to the overall deposited ∑ET with the same stochastic coefficient. For QCD dijet events with event pileup corresponding to a luminosity L=2×1033cm-2s-1 we compute σ=[(3.8 GeV)2+(0.97 GeV1/2√σET)2+(0.012σE_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 tti and W+jet events with high-momentum (pT>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).
All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)