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Title: Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions

Abstract

We calculate the cross section and transverse-momentum (P ) distribution of the Breit-Wheeler process in relativistic heavy-ion collisions and their dependence on collision impact parameter (b). To accomplish this, the Equivalent Photon Approximation (EPA) was generalized in a more differential way compared to the approach traditionally used for inclusive collisions. In addition, a lowest-order QED calculation with straightline assumption was performed as a standard baseline for comparison. The cross section as a function of b is consistent with previous calculations using the equivalent one-photon distribution function. Most importantly, the P shape from this model is strongly dependent on impact parameter and can quantitatively explain the P broadening observed recently by RHIC and LHC experiments. This broadening effect from the initial QED field strength should be considered in studying possible trapped magnetic field and multiple scattering in a Quark-Gluon Plasma (QGP). The impact-parameter sensitive observable also provides a controllable tool for studying extreme electromagnetic fields.

Authors:
 [1];  [2];  [1];  [3]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Shandong Univ., Qingdao (China); Brookhaven National Lab. (BNL), Upton, NY (United States); Rice Univ., Houston, TX (United States)
  3. Shandong Univ., Qingdao (China); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1580256
Report Number(s):
BNL-212451-2019-JAAM
Journal ID: ISSN 0370-2693
Grant/Contract Number:  
SC0012704; FG02-10ER41666
Resource Type:
Accepted Manuscript
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Volume: 800; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Zha, Wangmei, Brandenburg, James Daniel, Tang, Zebo, and Xu, Zhangbu. Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions. United States: N. p., 2019. Web. doi:10.1016/j.physletb.2019.135089.
Zha, Wangmei, Brandenburg, James Daniel, Tang, Zebo, & Xu, Zhangbu. Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions. United States. doi:10.1016/j.physletb.2019.135089.
Zha, Wangmei, Brandenburg, James Daniel, Tang, Zebo, and Xu, Zhangbu. Fri . "Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions". United States. doi:10.1016/j.physletb.2019.135089. https://www.osti.gov/servlets/purl/1580256.
@article{osti_1580256,
title = {Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions},
author = {Zha, Wangmei and Brandenburg, James Daniel and Tang, Zebo and Xu, Zhangbu},
abstractNote = {We calculate the cross section and transverse-momentum (P⟂) distribution of the Breit-Wheeler process in relativistic heavy-ion collisions and their dependence on collision impact parameter (b). To accomplish this, the Equivalent Photon Approximation (EPA) was generalized in a more differential way compared to the approach traditionally used for inclusive collisions. In addition, a lowest-order QED calculation with straightline assumption was performed as a standard baseline for comparison. The cross section as a function of b is consistent with previous calculations using the equivalent one-photon distribution function. Most importantly, the P⟂ shape from this model is strongly dependent on impact parameter and can quantitatively explain the P⟂ broadening observed recently by RHIC and LHC experiments. This broadening effect from the initial QED field strength should be considered in studying possible trapped magnetic field and multiple scattering in a Quark-Gluon Plasma (QGP). The impact-parameter sensitive observable also provides a controllable tool for studying extreme electromagnetic fields.},
doi = {10.1016/j.physletb.2019.135089},
journal = {Physics Letters B},
number = C,
volume = 800,
place = {United States},
year = {2019},
month = {11}
}

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