Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866918065044717568 |
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| author | Wu, Xiang-Yu Gao, Han Forster, Bailey Gale, Charles Jackson, Greg Jeon, Sangyong |
| author_facet | Wu, Xiang-Yu Gao, Han Forster, Bailey Gale, Charles Jackson, Greg Jeon, Sangyong |
| contents | We present the first theoretical study of the polarization of lepton pairs produced in $\sqrt{s_\mathrm{NN}} = 5.02$ TeV Pb+Pb collisions at the LHC, using next-to-leading order (NLO) dilepton emission rates. These calculations employ a multi-stage framework to simulate the evolution of relativistic heavy-ion collisions, and to explore the sensitivity of polarization to early times. It is found that the intermediate invariant-mass dileptons are indeed probes of the thermal equilibration process, and go beyond the reach of hadronic observables. We compute the polarization anisotropy coefficient obtained with LO dilepton rates, and show that the LO and NLO results differ radically, both in trend and in magnitude, at low and intermediate lepton pair invariant masses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15052 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions Wu, Xiang-Yu Gao, Han Forster, Bailey Gale, Charles Jackson, Greg Jeon, Sangyong Nuclear Theory High Energy Physics - Phenomenology Nuclear Experiment We present the first theoretical study of the polarization of lepton pairs produced in $\sqrt{s_\mathrm{NN}} = 5.02$ TeV Pb+Pb collisions at the LHC, using next-to-leading order (NLO) dilepton emission rates. These calculations employ a multi-stage framework to simulate the evolution of relativistic heavy-ion collisions, and to explore the sensitivity of polarization to early times. It is found that the intermediate invariant-mass dileptons are indeed probes of the thermal equilibration process, and go beyond the reach of hadronic observables. We compute the polarization anisotropy coefficient obtained with LO dilepton rates, and show that the LO and NLO results differ radically, both in trend and in magnitude, at low and intermediate lepton pair invariant masses. |
| title | Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions |
| topic | Nuclear Theory High Energy Physics - Phenomenology Nuclear Experiment |
| url | https://arxiv.org/abs/2412.15052 |