Medium Modifications of Heavy-Flavor Jet Angularities in High-Energy Nuclear Collisions  

作　　者：Yao Li Shi-Yong Chen Wei-Xi Kong Sa Wang Ben-Wei Zhang 

机构地区：[1]Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China [2]Huanggang Normal University,Huanggang 438000,China [3]College of Science,China Three Gorges University,Yichang 443002,China [4]Center for Astronomy and Space Sciences and Institute of Modern Physics,China Three Gorges University,Yichang 443002,China

出　　处：《Chinese Physics Letters》2025年第1期40-47,共8页中国物理快报(英文版)

基　　金：supported by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2020B0301030008);the National Natural Science Foundation of China(Grant Nos.11935007 and 12035007);supported by the Open Foundation of the Key Laboratory of Quark and Lepton Physics(MOE)(Grant No.QLPL2023P01);the Talent Scientific Star-up Foundation of the China Three Gorges University(CTGU)(Grant No.2024RCKJ013)。

摘　　要：We present the first theoretical study on heavy-flavor jet angularities(λ_(α)^(κ))in Pb+Pb collisions at√SNN=5.02 Te V.The initial production of heavy-flavor jets was carried out using the POWHEG+PYTHIA8 prescription.In contrast,the SHELL transport model describes jet evolution in the quark-gluon plasma(QGP).In p+p collisions,we observed narrower angularity distributions for D ^(0)-tagged jets than for inclusive jets,consistent with the ALICE preliminary results.We then demonstrate that jet quenching in the QGP slightly widens the angularity distribution of D ^(0)-tagged jets in Pb+Pb collisions relative to that in p+p collisions for a jet transverse momentum of 10<pch/T,jet<20 Ge V/c.In contrast,the angularity distributions of the inclusive and D ^(0)-tagged jets become narrower in Pb+Pb collisions relative to p+p atpch/T,jet>20 Ge V/c because of the strong influence of selection bias.Additionally,by comparing the average angularities<λ_(α)^(κ)>of the inclusive,D ^(0)-tagged,and B ^(0)-tagged jets with varyingαandκ,we show that the larger the quark mass,the lower the jet’s<λ_(α)^(κ)>values are.As a result of the slenderer initial distribution,we predict that compared with inclusive jets,heavy-flavor jets,especially B~0-tagged ones,will suffer stronger modifications of<λ_(α)^(κ)>in Pb+Pb relative to p+p at 10<pch/T,jet<20 Ge V/c.For a larger jet radius,a more significant broadening of the jet angularities was predicted because of the enhanced contribution of the wide-angle particles.

关 键 词：ANGULAR NARROW QUARK 

分 类 号：O572.33[理学—粒子物理与原子核物理]