Jet Radius and Momentum Splitting Fraction with Dynamical Grooming in Heavy-Ion Collisions  

作　　者：王磊 康锦文 张清 申淑婉 代巍 张本威 王恩科 Lei Wang;Jin-Wen Kang;Qing Zhang;Shuwan Shen;Wei Dai;Ben-Wei Zhang;Enke Wang(Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China;School of Mathematics and Physics,China University of Geosciences(Wuhan),Wuhan 430074,China;Guangdong Provincial Key Laboratory of Nuclear Science,Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China)

机构地区：[1]Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China [2]School of Mathematics and Physics,China University of Geosciences(Wuhan),Wuhan 430074,China [3]Guangdong Provincial Key Laboratory of Nuclear Science,Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China

出　　处：《Chinese Physics Letters》2023年第3期1-6,共6页中国物理快报（英文版）

基　　金：the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2020B0301030008);the Natural Science Foundation of China(Grant Nos.11935007 and 11805167)。

摘　　要：We investigate the medium modifications of momentum splitting fraction and groomed jet radius with both dynamical grooming and soft drop algorithms in heavy-ion collisions.In the calculation,the partonic spectrum of initial hard scattering in p+p collisions is provided by the event generator PYTHIA8,and the energy loss of fast parton traversing in a hot/dense quantum-chromodynamic medium is simulated with the linear Boltzmann transport model.We predict the normalized distributions of the groomed jet radiusθ_(g)and momentum splitting fraction z_(g)with the dynamical grooming algorithm in Pb+Pb collisions at(sNN)~(1/2)=5.02 TeV,then compare these quantities in dynamical grooming at a=0.1,with that in soft drop at z_(out)=0.1 andβ=0.It is found that the normalized distribution ratios Pb+Pb/p+p with respect to z_(g)in z_(cut)=0.1,β=0 soft drop case are close to unity,those in a=0.1 dynamical grooming case show enhancement at small z_(g),and Pb+Pb/p+p with respect toθ_(g)in the dynamical grooming case demonstrate weaker modification than those in the soft drop counterparts.We further calculate the groomed jet number averaged momentum splitting fraction_(jets)and averaged groomed jet radius<θ_(g)>_(jets)in p+p and A+A for both grooming cases in three p_T~(ch jet)intervals,and find that the originally generated well balanced groomed jets will become more momentum imbalanced and jet size less narrowed due to jet quenching,and weaker medium modification of z_(g)andθ_(g)in the a=0.1 dynamical grooming case than in the soft drop counterparts.

关 键 词：MOMENTUM DYNAMICAL RADIUS 

分 类 号：O571.6[理学—粒子物理与原子核物理]