Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions
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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- SC0012704; FG02-10ER41666
- OSTI ID:
- 1630439
- Alternate ID(s):
- OSTI ID: 1580256
- Report Number(s):
- BNL-212451-2019-JAAM; S0370269319308111; 135089; PII: S0370269319308111
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 800 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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