Abstract
The LHC data on jet fragmentation function and jet shapes in PbPb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed and interpreted in the frameworks of PYQUEN jet quenching model. A specific modification of longitudinal and radial jet profiles in most central PbPb collisions as compared with pp data is close to that obtained with PYQUEN simulations taking into account wide-angle radiative and collisional partonic energy loss. The contribution of radiative and collisional loss to the medium-modified intra-jet structure is estimated.
Highlights
Studying the modification of jets as they are formed from energetic partons propagating through the hot and dense medium created in ultrarelativistic heavy ion collisions is a useful tool for probing the produced matter’s properties
The recently published experimental data on the medium-modified jet structure include the measurement of jet shapes [43] and the jet fragmentation function [44,45]
If the contribution of the wide-angle partonic energy loss to the total loss is large enough, the decrease in the yield of jet particles at high pT and the broadening of the jet core can be compensated by significant jet energy “rescaling” and converted into an increase in the particle yield and an unmodified radial profile at small radii
Summary
Studying the modification of jets as they are formed from energetic partons propagating through the hot and dense medium created in ultrarelativistic heavy ion collisions is a useful tool for probing the produced matter’s properties. Jet quenching was observed for the first time at RHIC experiments via measurements of inclusive high- pT hadron√production in gold–gold collisions at center-of-mass energy sNN = 200 GeV It was manifested as the suppression of overall high- pT hadron rates and back-to-back dihadron azimuthal correlations (including the specific azimuthal angle dependence of the effect with respect to the event plane). The recently published experimental data on the medium-modified jet structure include the measurement of jet shapes (radial profile) [43] and the jet fragmentation function (longitudinal profile) [44,45]. It was suggested in [46] that it could be of interest to study moments of jet fragmentation function
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