Direct Access to Nuclear Photon TMDs with In Situ Probes in Ultraperipheral Heavy-Ion Collisions
Abstract
Resolving local structure in photon distributions is an important goal in probing strong coherent electromagnetic fields. We propose using electron--positron pairs produced in situ in ultraperipheral heavy-ion collisions as dynamical probes to directly extract photon distributions. We define a theoretical reference cross section using the complete tree-level amplitude for two-photon-induced radiative lepton-pair production. When background effects factorize into a scalar Bose-enhancement factor, the ratio of the background-modified to reference differential cross sections, minus unity, yields the photon occupation number at a fixed momentum. Finite bins yield averages weighted by the reference cross section. We specify the conditions under which kinematic selections, acceptance, and radiative corrections preserve this local inversion.
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BibTeX
@misc{li2026direct,
title = {{Direct Access to Nuclear Photon TMDs with In Situ Probes in Ultraperipheral Heavy-Ion Collisions}},
author = {Cong Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29400},
eprint = {2610.29400},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29400},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Direct Access to Nuclear Photon TMDs with In Situ Probes in Ultraperipheral Heavy-Ion Collisions
AU - Cong Li
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29400
UR - https://arxiv.org/abs/2610.29400
AB - Resolving local structure in photon distributions is an important goal in probing strong coherent electromagnetic fields. We propose using electron--positron pairs produced in situ in ultraperipheral heavy-ion collisions as dynamical probes to directly extract photon distributions. We define a theoretical reference cross section using the complete tree-level amplitude for two-photon-induced radiative lepton-pair production. When background effects factorize into a scalar Bose-enhancement factor, the ratio of the background-modified to reference differential cross sections, minus unity, yields the photon occupation number at a fixed momentum. Finite bins yield averages weighted by the reference cross section. We specify the conditions under which kinematic selections, acceptance, and radiative corrections preserve this local inversion.
ER -