Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at √sNN =2.76 TeV with the ATLAS Detector

Abstract

Measurements of inclusive jet production are performed in pp and Pb þ Pb collisions at sNN=2.76 TeV 2.76 TeV with the ATLAS detector at the LHC, corresponding to integrated luminosities of 4.0 and 0.14 nb−1, respectively. The jets are identified with the anti-kt algorithm with R ¼ 0.4, and the spectra are measured over the kinematic range of jet transverse momentum 32 < pT < 500 GeV and absolute rapidity jyj < 2.1 and as a function of collision centrality. The nuclear modification factor RAA is evaluated, and jets are found to be suppressed by approximately a factor of 2 in central collisions compared to pp collisions. The RAA shows a slight increase with pT and no significant variation with rapidity.