$p_T$ dispersion of inclusive jets in high-energy nuclear collisions

Abstract

In this paper, we investigate the medium modifications of $p_T$ dispersion($p_{T}D$) of inclusive jets with small radius ($R=0.2$) in Pb+Pb collisions at $\sqrt{s}=2.76$~TeV. The partonic spectrum in the initial hard scattering of elementary collisions are obtained by an event generator POWHEG+PYTHIA, which matches the next-to-leading (NLO) matrix elements with parton showering, and energy loss of fast parton traversing in hot/dense QCD medium is calculated by Monte Carlo simulation within Higher-Twist formalism of jet quenching in heavy-ion collisions. We present the model calculations of normalized $p_{T}D$ distributions for inclusive jets in p+p and Pb+Pb collisions at $\sqrt{s}=2.76$~TeV, which give nice descriptions of ALICE measurements. It is shown that the $p_{T}D$ distributions of inclusive jets in Pb+Pb are shifted to higher $p_{T}D$ region relative to that in p+p. Thus the nuclear modification factor of $p_{T}D$ distributions for inclusive jets is smaller than unity at small $p_{T}D$ region, while larger than one at large $p_{T}D$ region. This behaviour results from more uneven $p_T$ of jet constituents as well as the fraction alteration of gluon/quark initiated jets in heavy-ion collisions. The difference of $p_{T}D$ distributions between groomed and ungroomed jets in Pb+Pb collisions are also discussed.

References in corpus (13)

• PYTHIA 6.4 Physics and Manual
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Studies of jet quenching using isolated-photon + jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with the ATLAS Detector
• Gaining (Mutual) Information about Quark/Gluon Discrimination
• Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector
• Medium response in JEWEL and its impact on jet shape observables in heavy ion collisions
• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• A theory of jet shapes and cross sections: from hadrons to nuclei
• Vector boson plus one jet production in POWHEG
• The physics of $Z^0/{\gamma }^{\ast }$-tagged jets at the LHC
• Thermal field theory derivation of the source term induced by a fast parton from the quark energy-momentum tensor
• Radial profile of bottom quarks in jets in high-energy nuclear collisions

Cited by in corpus (5)

• Transverse momentum balance of dijets in Xe+Xe collisions at the LHC
• Probing the mass effect of heavy quark jets in high-energy nuclear collisions
• Production of leptons from decay of heavy-flavor hadrons in high-energy nuclear collisions
• Exploring system size dependence of jet modification in heavy-ion collisions
• Contrasting Features of Parton Energy Loss in Heavy-ion Collisions at RHIC and the LHC