The medium-temperature dependence of jet transport coefficient in high-energy nucleus-nucleus collisions  

作　　者：Man Xie Qing-Fei Han En-Ke Wang Ben-Wei Zhang Han-Zhong Zhang 

机构地区：[1]Key Laboratory of Atomic and Subatomic Structure and Quantum Control(MOE),Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter,Institute of Quantum Matter South China Normal University,Guangzhou,510006,China [2]Guangdong-Hong Kong Joint Laboratory of Quantum Matter,Guangdong Provincial Key Laboratory of Nuclear Science,Southern Nuclear Science Computing Center,South China Normal University,Guangzhou 510006,China [3]Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan,430079,China

出　　处：《Nuclear Science and Techniques》2024年第7期173-191,共19页核技术（英文）

基　　金：Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030008);Science and Technology Program of Guangzhou(No.2019050001);National Science Foundation of China(Nos.12347130 and 11935007).

摘　　要：The medium-temperature T dependence of the jet transport coefficient̂q was studied via the nuclear modification factor RAA(p_(T))and elliptical flow parameter v_(2)(p_(T))for large transverse momentum p_(T) hadrons in high-energy nucleus-nucleus collisions.Within a next-to-leading-order perturbative QCD parton model for hard scatterings with modified fragmentation functions due to jet quenching controlled by q,we check the suppression and azimuthal anisotropy for large p_(T) hadrons,and extract q by global fits to RAA(pT)and v_(2)(pT)data in A+A collisions at RHIC and LHC,respectively.The numerical results from the best fits show that q∕T^(3) goes down with local medium-temperature T in the parton jet trajectory.Compared with the case of a constant q∕T^(3),the going-down T dependence of q∕T^(3) makes a hard parton jet to lose more energy near T_(c) and therefore strengthens the azimuthal anisotropy for large pT hadrons.As a result,v_(2)(p_(T))for large pT hadrons was enhanced by approximately 10%to better fit the data at RHIC/LHC.Considering the first-order phase transition from QGP to the hadron phase and the additional energy loss in the hadron phase,v_(2)(p_(T))is again enhanced by 5-10%at RHIC/LHC.

关 键 词：Jet quenching Jet transport parameter Hadron suppression Elliptic flow coefficient Energy loss asymmetry 

分 类 号：O571[理学—粒子物理与原子核物理]