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Scaling of pre-equilibrium dilepton production in QCD Kinetic Theory

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arxiv 2403.04846 v2 pith:GVZD44XO submitted 2024-03-07 hep-ph nucl-th

classification hep-phnucl-th
keywords dileptonpre-equilibriumproductionscalingkinetictheoryanalysisattractor
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We use QCD kinetic theory to compute dilepton production coming from the pre-equilibrium phase of the Quark-Gluon Plasma created in high-energy heavy-ion collisions. We demonstrate that the dilepton spectrum exhibits a simple scaling in terms of the specific shear viscosity $\eta/s$ and entropy density $dS/d\zeta \sim {\scriptstyle \left(T\tau^{1/3}\right)_\infty^{3/2}}$, which can be derived from dimensional analysis in the presence of a pre-equilibrium attractor. Based on this scaling we perform event-by-event calculations of in-medium dilepton production and determine the invariant mass range where the pre-equilibrium yield is the leading contribution.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions

    nucl-th 2024-12 conditional novelty 7.0 of 10

    Using next-to-leading-order rates, the paper predicts that dilepton polarization changes sign and magnitude in low and intermediate invariant-mass ranges, making it a sensitive probe of gluonic processes and pre-equil...

  2. Jet quenching in out-of-equilibrium QCD matter

    hep-ph 2025-11 conditional novelty 6.0 of 10

    Medium-induced gluon radiation computed with kinetic-theory backgrounds shows a persistent, non-vanishing imprint of the pre-equilibrium stage on jet spectra, so jet observables can probe early-time dynamics in heavy-...

  3. Effective temperatures of the QGP from thermal photon and dilepton production

    nucl-th 2024-12 conditional novelty 6.0 of 10

    In the Trajectum model, dilepton effective temperatures reliably track the quark-gluon plasma temperature, while photon effective temperatures are biased by flow and stay near 250-300 MeV.

  4. Thermal dilepton production within conformal viscous Gubser flow

    hep-ph 2025-06 conditional novelty 5.0 of 10

    Thermal dilepton yields and effective temperatures are computed for conformal viscous Gubser flow, showing larger yields for lower q (larger systems) and higher effective temperatures for smaller systems.

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