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Virtual photon polarization and dilepton anisotropy in relativistic nucleus-nucleus collisions

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arxiv 1802.02479 v2 pith:E3TN5H33 submitted 2018-02-07 hep-ph

classification hep-ph
keywords dileptonanisotropyannihilationcollisionsmediumnucleus-nucleusphasephoton
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The polarization of virtual photons produced in relativistic nucleus-nucleus collisions provides information on the conditions in the emitting medium. In a hydrodynamic framework, the resulting angular anisotropy of the dilepton final state depends on the flow as well as on the transverse momentum and invariant mass of the photon. We illustrate these effects in dilepton production from quark-antiquark annihilation in the QGP phase and $\pi^+\pi^-$ annihilation in the hadronic phase for a static medium in global equilibrium and for a longitudinally expanding system.

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Cited by 3 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. Thermal Dilepton Polarization under Rotation or Magnetic Field in Heavy-ion Collisions

    hep-ph 2026-07 conditional novelty 6.5 of 10

    Vorticity and magnetic fields induce characteristically different dilepton polarization spectra via modified quark propagators, with λ_θ decreasing monotonically under rotation but oscillating under magnetic fields du...

  3. The polarization of thermal dileptons emitted in high-energy heavy-ion collisions

    nucl-th 2026-05 unverdicted novelty 5.0 of 10

    Thermal dilepton polarization in LHC heavy-ion collisions is sensitive to QGP in-medium properties, with a one-to-one mapping derived between dielectron and dimuon channels.

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