https://doi.org/10.1051/epjconf/202327606010
Initial electromagnetic field dependence of photon-induced production in isobaric collisions at STAR
1
Department of Modern Physics, University of Science and Technology of China,
Hefei
230026, China
2
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China,
Hefei
230026, China
* e-mail: skfwyl@mail.ustc.edu.cn
Published online: 1 March 2023
In these proceedings, we present the measurements of e+e− pair production at very low transverse momentum in 4496Ru + 4496Ru and 4096Zr + 4096Zr collisions at √SNN = 200 GeV by the STAR experiment. The electromagnetic field dependence of photon-induced production is studied for the first time, via comparisons between the measurements in isobaric collisions to the published results in Au+Au and U+U collisions. Taken the initial electromagnetic field dependence into account, the excess yield of e+e− pair production shows an impact parameter dependence. The results are also compared to model calculations based on EPA-QED, which describe the observed excess yields for different collision species.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
