pT dispersion of inclusive jets in high-energy nuclear collisions

In this study, we investigate the impact of jet quenching on the p(T) dispersion (p(T)D) of inclusive jets (R=0.2) in central Pb+Pb (0%-10%) collisions at root s =2.76 TeV. The partonic spectrum in the initial hard scattering of elementary collisions is obtained by an event generator POWHEG+PYTHIA, which matches the next-to-leading order (NLO) matrix elements with parton showering, and the energy loss of a fast parton traversing through hot/dense QCD medium is calculated using Monte Carlo simulation within the Higher-Twist formalism of jet quenching in heavy-ion collisions. We present model calculations of the normalized p(T)D distributions of inclusive jets in p+p and central Pb+Pb collisions at root s =2.76 TeV, which offer good descriptions of ALICE measurements. It is shown that the p(T)D distributions of inclusive jets in central Pb+Pb collisions shift significantly to a higher p(T)D region relative to those in p+p collisions. Thus, the nuclear modification ratio of the p(T)D distributions of inclusive jets is smaller than unity in the small p(T)D region and larger than one in the large p(T)D region. This behavior is caused by a more uneven p(T) distribution for jet constituents as well as the fraction alteration of quark/gluon initiated jets in heavy-ion collisions. The difference in p(T)D distribution between groomed and ungroomed jets in Pb+Pb collisions is also discussed.