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Photon and dilepton emission anisotropy for a magnetized quark-gluon plasma

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arxiv 2307.07557 v2 pith:6FXBYLAO submitted 2023-07-14 hep-ph nucl-th

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

We study the higher-order anisotropy coefficients $v_4$ and $v_6$ in the photon and dilepton emission from a hot magnetized quark-gluon plasma. Together with the earlier predictions for $v_2$, these results show a distinctive pattern of the anisotropy coefficients in several kinematic regimes. In the case of photon emission, nonzero coefficients $v_n$ (with even $n$) have opposite signs at small and large values of the transverse momentum (i.e., $k_T\lesssim \sqrt{|eB|}$ and $k_T\gtrsim \sqrt{|eB|}$, respectively). Additionally, the $v_n$ signs alternate with increasing $n$, and their approximate values decrease as $1/n^2$ in magnitude. The anisotropy of dilepton emission is well pronounced only at large transverse momenta and small invariant masses (i.e., when $k_T\gtrsim \sqrt{|eB|}$ and $M\lesssim \sqrt{|eB|}$). The corresponding $v_4$ and $v_6$ coefficients are of the same magnitude and show a similar alternating sign pattern with increasing $n$ as in the photon emission.

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Cited by 6 Pith papers

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

  1. 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...

  2. Rotating synchrotron radiation: Photon emission from magnetized and rotating quark-gluon plasma

    hep-ph 2026-02 conditional novelty 6.0 of 10

    Rotation enhances synchrotron photon emission from negatively charged quarks in a magnetized QGP, producing a low-transverse-momentum v2 that can reduce the direct photon puzzle tension.

  3. Photon emission from weakly magnetized neutral pions

    hep-ph 2025-12 conditional novelty 6.0 of 10

    In a proton-loop hadronic model, a weak magnetic field suppresses π0→γγ at O(|eB|²/m_P⁴), with a small anisotropy strongest for pion momenta perpendicular to the field.

  4. Dilepton Spectra and Even Flow Harmonics in a Magnetized QGP: An Ideal Hydrodynamic Study

    hep-ph 2025-08 unverdicted novelty 6.0 of 10

    In a magnetized QGP described by Gubser flow, decay-channel dileptons show a v2 sign flip that is independent of impact parameter and conductivity, offering a new probe of electromagnetic fields.

  5. Thermal Dilepton Polarization under Rotation or Magnetic Field in Heavy-ion Collisions

    hep-ph 2026-07 conditional novelty 5.0 of 10

    In a theoretical calculation, a rotating quark-gluon plasma produces weakly transverse-polarized dileptons with a smoothly falling λ_θ(M), while a magnetic field produces strongly oscillating λ_θ(M) tied to Landau-lev...

  6. Beyond leading-logarithm photon production from two-loop diagrams in a hot QCD medium

    hep-ph 2026-07 accept novelty 4.0 of 10

    Two-loop imaginary-time QCD self-energies yield the same hard-photon LL and BLL rates as kinetic theory for Compton and qq̄ annihilation, with topology II vanishing on-shell but restoring the Ward identity.

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