The Calorimeter Liquid Argon sampling Stable, uniform response Ar purity Uranium absorber(Cu/Fe for coarse hadronic) dense absorber hence can be compact Compensated EM and hadronic response Linear response Hermetic with full coverage ynl<42(0≈29) Resolution o/E 15%/VE(Gev)"fine" EM 50%o/VE(GeV)"coarse"jet MET a+b S+C"S72 (run1 sum of et a~1.896eV b~6.7E ) C9.9E-6/GeVThe Calorimeter Z y x θ ϕ • Liquid Argon sampling 9 Stable, uniform response 9 LAr purity • Uranium absorber (Cu/Fe for coarse hadronic) 9 dense absorber hence can be compact 9 Compensated EM and hadronic response 9 Linear response • Hermetic with full coverage 9 |η| < 4.2 (θ ≈ 2o) Resolution: σ/E ~ 15%/√E(GeV) “fine” EM 50%/√E(GeV) “coarse” jet σMET ~ a + b*ST + c*ST2 (run1) ST scalar sum of ET a ~1.89GeV, b ~6.7E-3, c ~9.9E-6/GeV