Hadron productions and jet substructures associated with Z0/γ in Pb plus Pb collisions at the LHC

作者：Zhang, Shan-Liang^*; Xing, Hongxi^*; Zhang, Ben-Wei^*

来源：Science China: Physics, Mechanics and Astronomy , 2023, 66(12): 121012.

DOI：10.1007/s11433-023-2251-4

• relativistic heavy-ion collisions
• jet quenching
• hadronization
• jet substructures

We carry out a detailed study of medium modifications on Z(0)/gamma+hadron correlations as well as jet substructures in association with Z(0)/gamma in Pb+Pb collisions with root(NN)-N-s = 5.02 TeV at the LHC. We utilize the linear Boltzmann transport (LBT) model to simulate the jet-medium interactions and medium response, and an extended cluster hadronization model to investigate the nonperturbative transition of quarks and gluons into final hadrons in heavy-ion collisions. Including hadronization effect, we can well describe Z(0)/gamma+hadrons correlations and Z(0)/gamma-tagged jet substructures in both p+p and Pb+Pb collisions simultaneously. Medium modification on jet profile and jet fragmentation functions indicate that particles carrying a large fraction of the jet momentum are generally closely aligned with the jet axis, whereas low-momentum particles are observed to have a much broader angular distribution relative to jet axis in Pb+Pb collisions due to jet-medium interactions. In particular, we find that Z(0)/gamma-tagged hadron correlations are sensitive to the soft particles from the dense medium and medium response, while jet-substructures show weak dependence on those soft hadrons with only a fraction of them falling inside the jet area.