Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session KF: Jets in Heavy-ion Collisions II
10:30 AM–12:18 PM,
Saturday, October 29, 2022
Hyatt Regency Hotel
Room: Celestin F
Chair: Raghav Kunnawalkam Elayavalli
Abstract: KF.00007 : Measurements of the Collision Energy Dependence of the Polarized $\gamma \gamma \rightarrow e^{+} e^{-}$ Process in Peripheral Au+Au Collisions with the STAR Detector*
11:42 AM–11:54 AM
Presenter:
Xiaofeng Wang
(Shandong Univ)
Author:
Xiaofeng Wang
(Shandong Univ)
Collaboration:
STAR Collaboration
It has recently been realized that even in peripheral collisions, the dielectron production at very low transverse momentum ($p_{T}$) still originates mainly from the two-photon interactions. Measurements of the polarized $\gamma \gamma \rightarrow e^{+} e^{-}$ process in peripheral collisions provide an opportunity to directly test its collision energy and impact parameter dependences, which is sensitive to the infrared divergence of the photon flux.
In this presentation, we will present the STAR measurements of energy and impact parameter dependence of electron pair mean $p_{T}$ and cross section from polarized $\gamma \gamma \rightarrow e^{+} e^{-}$ process in peripheral Au+Au collisions at $\sqrt{s_{\rm {NN}}}=54.4$ GeV and $\sqrt{s_{\rm {NN}}}=200$ GeV. Furthermore, the 4th-order angular modulation, predicted for collisions of linearly-polarized photons, will be presented. The physics implications of these results will be discussed together with model comparisons.
*This work was funded by the National Natural Science Foundation of China under Grant Nos. 12075139, the U.S. DOE Office of Science under contract Nos. DE-SC0012704, DE-FG02-10ER41666, and DE-AC02-98CH10886.
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