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Medium modifications of girth distributions for inclusive jets and Z0+jets in relativistic heavy-ion collisions at the LHC

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Chinese Physics C 2021年第2期45卷 426-432页

作者： Jun Yan Shi-Yong Chen Wei Dai Zhang Ben-Wei En-Ke Wang Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China School of Mathematics and Physics China University of GeosciencesWuhan 430074China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

In this paper,we investigate the medium modifications of girth distributions for inclusive jets and Z^0 tagged jets with a small radius( R=0.2 )in Pb+Pb collisions with √s==2.76 TeV at the *** partonic spectra in the initial hard scattering of elementary collisions are 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 the hot/dense QCD medium is calculated by Monte Carlo simulation within the higher-twist formalism of jet quenching in heavy-ion *** present the model calculations of event normalized girth distributions for inclusive jets in p+p and Pb+Pb collisions at √s=2.76 TeV,which give good descriptions of ALICE *** is shown that the girth distributions of inclusive jets in Pb+Pb are shifted to lower girth regions relative to those in p+***,the nuclear modification factor of girth distributions for inclusive jets is larger than unity at small girth regions and smaller than unity at large girth *** behavior results from softer fragments inside a jet as well as the fraction alteration of gluon/quark initiated jets in heavy-ion *** further predict the girth distributions for Z^0 boson tagged jets in Pb+Pb collisions at √s=2.76 TeV and demonstrate that the medium modification on girth distributions for Z^0 tagged jets is less pronounced compared to that for inclusive jets because the dominant components of Z^0 tagged jets are quark-initiated jets.

关键词： heavy-ion collisions jet quenching quark gluon plasma jet substructure

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p_(T) dispersion of inclusive jets in high-energy nuclear collisions

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Chinese Physics C 2022年第10期46卷 139-146页

作者： Shi-Yong Chen Jun Yan Wei Dai Ben-Wei Zhang En-Ke Wang Huanggang Normal University Huanggang 438000China Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China School of Mathematics and Physics China University of GeosciencesWuhan 430074China Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China

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 √s=2.76 *** 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 *** present model calculations of the normalized p_(T)D distributions of inclusive jets in p+p and central Pb+Pb collisions at √s=2.76 TeV,which offer good descriptions of ALICE *** 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 ***,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 *** 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 *** difference in p_(T)D distribution between groomed and ungroomed jets in Pb+Pb collisions is also discussed.

关键词： jet quenching jet substructure heavy-ion collisions

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