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PreprintCC BY-NC-ND 4.0arXiv

Probing the production mechanisms of virtual photons at RHIC

  • STAR Collaboration
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Abstract

We report the measurement of direct virtual photon (γ*dir → e+e-) in four Au+Au collision energies at √(sNN) = 14.6--54.4 GeV. The γ*dir yields scale with charged-particle multiplicity ((dNch/dη)α) as α=1.43 ± 0.04 (stat.) ± 0.03(sys.), independent of collision energies and centralities, exceeding hadronic expectations and indicating notable contribution from QGP phase. At √(sNN)= 54.4 GeV, the direct virtual photon mass distributions are further studied over 0.1 < Mee < 1.1 GeV/c2, and are found to evolve from exponential to power-law form with increasing pT, signaling a shift from "blackbody" radiation to emission governed by Kroll-Wada formalism.

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Cite

BibTeXRIS
BibTeX
@misc{collaboration2026probing,
  title = {{Probing the production mechanisms of virtual photons at RHIC}},
  author = {STAR Collaboration},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.19680},
  eprint = {2610.19680},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.19680},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Probing the production mechanisms of virtual photons at RHIC
AU  - STAR Collaboration
PY  - 2026
DA  - 2026/10/14
PB  - arXiv
DO  - 10.48550/arxiv.2610.19680
UR  - https://arxiv.org/abs/2610.19680
AB  - We report the measurement of direct virtual photon (γ^*_dir → e^+e^-) in four Au+Au collision energies at √(s_NN) = 14.6--54.4 GeV. The γ^*_dir yields scale with charged-particle multiplicity ((dN_ch/dη)^α) as α=1.43 ± 0.04 (stat.) ± 0.03(sys.), independent of collision energies and centralities, exceeding hadronic expectations and indicating notable contribution from QGP phase. At √(s_NN)= 54.4 GeV, the direct virtual photon mass distributions are further studied over 0.1 < M_ee < 1.1 GeV/c^2, and are found to evolve from exponential to power-law form with increasing p_T, signaling a shift from "blackbody" radiation to emission governed by Kroll-Wada formalism.
ER  -