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| Autori principali: | , , , , |
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| Natura: | Preprint |
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2023
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| Accesso online: | https://arxiv.org/abs/2312.17460 |
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| _version_ | 1866916076387827712 |
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| author | Gao, Zhan Chen, Lin Hu, Peng-Hui Xie, Man Zhang, Han-Zhong |
| author_facet | Gao, Zhan Chen, Lin Hu, Peng-Hui Xie, Man Zhang, Han-Zhong |
| contents | We carry out a detailed study of medium modifications on momentum and angular correlations between a large transverse momentum hadron and a $Z/γ$ 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 $Z/γ$-hadron pairs in $pp$ and $AA$ collisions, and predict the correlations for the $γ$-hadron in central $PbPb$ collisions at 5.02 TeV. The numerical analyses for the $Z/γ$-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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_17460 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Momentum and angular correlations in \texorpdfstring{$Z/γ$}{Z/gamma}-hadron production in relativistic heavy-ion collisions Gao, Zhan Chen, Lin Hu, Peng-Hui Xie, Man Zhang, Han-Zhong High Energy Physics - Phenomenology We carry out a detailed study of medium modifications on momentum and angular correlations between a large transverse momentum hadron and a $Z/γ$ 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 $Z/γ$-hadron pairs in $pp$ and $AA$ collisions, and predict the correlations for the $γ$-hadron in central $PbPb$ collisions at 5.02 TeV. The numerical analyses for the $Z/γ$-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. |
| title | Momentum and angular correlations in \texorpdfstring{$Z/γ$}{Z/gamma}-hadron production in relativistic heavy-ion collisions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2312.17460 |