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Article Dans Une Revue Nucl.Phys.A Année : 2023

Transverse mass scaling of dilepton radiation off a quark-gluon plasma

Résumé

The spectrum of dileptons produced by the quark-gluon plasma in an ultrarelativistic nucleus-nucleus collision depends only, to a good approximation, on the transverse mass M_t of the dilepton. This scaling is exact as long as transverse flow is negligible, and the system is in local thermal equilibrium. We implement a state-of-the-art modelization of kinetic and chemical equilibration in the early stages of the evolution to study the modifications of the spectrum. Violations of M_t scaling resulting from these effects are evaluated as a function of the shear viscosity to entropy ratio (eta/s) that controls the equilibration time. We determine the dependence of the spectrum on system size, centrality, rapidity, and collision energy. We show that the quark-gluon plasma produces more dileptons than the Drell-Yan process up to invariant masses of order M = 4 GeV. Due to different kinematics, for a given M_t , the dependence of the dilepton yield on M is opposite for the two processes, so that experiment alone can in principle determine which process dominates.

Dates et versions

hal-03520944 , version 1 (11-01-2022)

Identifiants

Citer

Maurice Coquet, Xiaojian Du, Jean-Yves Ollitrault, Soeren Schlichting, Michael Winn. Transverse mass scaling of dilepton radiation off a quark-gluon plasma. Nucl.Phys.A, 2023, 1030, pp.122579. ⟨10.1016/j.nuclphysa.2022.122579⟩. ⟨hal-03520944⟩
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