Lighting up the Photon Wigner Distribution via Dilepton Productions - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2024

Lighting up the Photon Wigner Distribution via Dilepton Productions

Lin Chen
  • Fonction : Auteur
Shu-Yi Wei
  • Fonction : Auteur
Bo-Wen Xiao
  • Fonction : Auteur

Résumé

We present a systematic investigation of lepton pair production through photon-photon fusion processes in heavy-ion collisions. It is demonstrated that the dilepton production at a given impact parameter ($b_\perp$) with a fixed transverse momentum imbalance ($q_\perp$) can be factorized into a unified formula in terms of the Wigner photon distribution of heavy nuclei. We show that this framework provides a comprehensive description of all the relevant data from RHIC to the LHC, with a strong evidence that the quasi-real photon can be radiated not only from the nucleus as a whole, standing for the coherent contribution, but also from the sub-structures inside the nucleus, representing the incoherent contribution. Further predictions are made for the anisotropies in the correlations between $q_\perp$, $b_\perp$, and the dilepton transverse momentum ($P_\perp$). This will help us to constrain the photon Wigner distribution which plays a crucial role to study the gluonic matter of nucleus at small-$x$ through the diffractive photoproduction processes in heavy ion collision.

Dates et versions

hal-04632202 , version 1 (02-07-2024)

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Yu Shi, Lin Chen, Shu-Yi Wei, Bo-Wen Xiao. Lighting up the Photon Wigner Distribution via Dilepton Productions. 2024. ⟨hal-04632202⟩
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