Abstract
We carry out a detailed study of medium modifications on Z0/γ+hadron correlations as well as jet substructures in association with Z0/γ in Pb+Pb collisions with \(\sqrt{s_{NN}}=5.02\ \text{TeV}\) 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 non-perturbative transition of quarks and gluons into final hadrons in heavy-ion collisions. Including hadronization effect, we can well describe Z0/γ+hadrons correlations and Z0/γ-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 Z0/γ-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.
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This work was supported by the Guangdong Major Project of Basic and Applied Basic Research (Grant No. 2020B0301030008), and the National Natural Science Foundation of China (Grant Nos. 12147131, 11935007, 12035007, and 12022512). Shan-Liang Zhang was also supported by the MOE Key Laboratory of Quark and Lepton Physics (CCNU) (Grant No. QLPL2021P01).
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Zhang, SL., Xing, H. & Zhang, BW. Hadron productions and jet substructures associated with Z0/γ in Pb+Pb collisions at the LHC. Sci. China Phys. Mech. Astron. 66, 121012 (2023). https://doi.org/10.1007/s11433-023-2251-4
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DOI: https://doi.org/10.1007/s11433-023-2251-4