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

Measurements of inclusive jet production are performed in $pp$ and Pb+Pb collisions at √sNN=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 $R=0.4$, and the spectra are measured over the kinematic range of jet transverse momentum 32<pT<500 GeV and absolute rapidity $|y|<2.1$ 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.