The impact of jet quenching on Z⁰-tagged jets in relativistic heavy-ion collisions at the CERN Large Hadron Collider is investigated. We employ the sherpa Monte Carlo program that combines next-to-leading-order matrix elements with matched resummation of parton shower to compute the initial Z⁰+jet production. The linear Boltzmann transport (LBT) model is then used to simulate the propagation, energy attenuation of, and medium response induced by jet partons in the quark-gluon plasma. With both higher-order corrections and matched soft and collinear radiation as well as a sophisticated treatment of parton energy loss and medium response in LBT, our numerical calculations can provide the best description so far of all available observables of Z⁰+jet simultaneously in both proton + proton and Pb+Pb collisions, in particular, the shift of the distribution in transverse momentum asymmetry xjZ=pTʲᵉᵗ/pTZ, the modification of azimuthal angle correlation in ΔφjZ=|φⱼₑₜ-φZ|, and the overall suppression of average number of Z⁰-tagged jets per boson RjZ at √s=5.02 TeV as measured by the Compact Muon Solenoid experiment. We also show that higher-order corrections to Z⁰+jet production play an indispensable role in understanding Z⁰+jet azimuthal angle correlation at small and intermediate ΔφjZ, and momentum imbalance at small xjZ. Jet quenching of the subleading jets is shown to lead to suppression of the Z⁰+jet correlation at small azimuthal angle difference ΔφjZ and at small xjZ.
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Zhang et al. (2018) studied this question.
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