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arXiv · 2312.17460

Momentum and angular correlations in \texorpdfstring{$Z/\gamma$}{Z/gamma}-hadron production in relativistic heavy-ion collisions

Zhan Gao·Lin Chen·Peng-Hui Hu·Man Xie·Han-Zhong Zhang
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Abstract

We carry out a detailed study of medium modifications on momentum and angular correlations between a large transverse momentum hadron and a $Z/\gamma$ trigger in relativistic heavy-ion collisions within a perturbative QCD parton model improved by the Sudakov resummation technique. The total energy loss of a hard parton propagating inside the medium is employed to modify the fragmentation function, while the medium-induced transverse momentum broadening is included in the resummation approach, and both of them are related to the jet transport parameter and obtained by the high-twist formalism. We obtain good agreements with the existing data on transverse momentum and azimuthal angular correlations for the $Z/\gamma$-hadron pairs in $pp$ and $AA$ collisions, and predict the correlations for the $\gamma$-hadron in central $PbPb$ collisions at 5.02 TeV. The numerical analyses for the $Z/\gamma$-hadron in central $PbPb$ collisions show that the normalized angular distribution is decorrelated due to the medium-induced transverse momentum broadening, however, the angular correlation is enhanced due to the parton energy loss, namely anti-broadening. The observed modification of the angular correlation is a result of the competition between the broadening and the anti-broadening. This work provides a reliable theoretical tool for a comprehensive and precise study of jet quenching in relativistic heavy-ion collisions.

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Zhan Gao, Lin Chen, Peng-Hui Hu, Man Xie, Han-Zhong Zhang. 2023-12-29. Momentum and angular correlations in \texorpdfstring{$Z/\gamma$}{Z/gamma}-hadron production in relativistic heavy-ion collisions. https://arxiv.org/abs/2312.17460

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