title: Momentum imbalance of isolated photon-tagged jet production at RHIC and LHC.
abstract: In collisions of ultrarelativistic nuclei, photon-tagged jets provide a unique opportunity to compare jet production and modification due to parton shower formation and propagation in strongly interacting matter at vastly different center-of-mass energies. We present first results for the cross sections of jets tagged by an isolated photon to O(α(em)α(s)(2)) in central Au+Au reactions with sqrt[s(NN)] = 200 GeV at RHIC and central Pb + Pb reactions with sqrt[s(NN)] = 2.76 TeV at LHC. We evaluate the increase in the transverse momentum imbalance of the observed γ + jet state, induced by the dissipation of the parton shower energy due to strong final-state interactions. Theoretical predictions to help interpret recent and upcoming experimental data are presented.
authors.affiliation: Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Dai
authors.affiliation: Los Alamos National Laboratory, Theoretical Division, MS B238, Los Alamos, NM 87545, USA.
authors.forename: Ivan
authors.initials: I
authors.lastname: Vitev
authors.affiliation: Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China.
authors.forename: Ben-Wei
authors.initials: BW
authors.lastname: Zhang