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Title: Benchmarking a nonequilibrium approach to photon emission in relativistic heavy-ion collisions

Journal Article · · Physical Review D
ORCiD logo [1];  [2];  [3];  [4];  [5];  [3]
  1. Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt am Main (Germany); Johann Wolfgang Goethe-Univ., Frankfurt am Main (Germany)
  2. Stony Brook Univ., NY (United States)
  3. GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany); Johann Wolfgang Goethe-Univ., Frankfurt am Main (Germany); Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt am Main (Germany);
  4. Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt am Main (Germany)
  5. McGill Univ., Montreal, QC (Canada)

In this study, the production of photons through binary scattering processes is investigated for equilibrated hadronic systems. More precisely, a nonequilibrium hadronic transport approach to describe relativistic heavy-ion collisions is benchmarked with respect to photon emission. Cross sections for photon production in π + ρ → π + γ and π + π → ρ + γ scattering processes are derived from an effective chiral field theory and implemented into the hadronic transport approach, SMASH (Simulating Many Accelerated Strongly-interacting Hadrons). The implementation is verified by systematically comparing the thermal photon rate to theoretical expectations. Further, the impact of form factors is discussed, scattering processes mediated by ω mesons are found to contribute significantly to the total photon production. Several comparisons of the yielded photon rates are performed: to parametrizations of the very same rates as used in hydrodynamic simulations, to previous works relying on different cross sections for the production of direct photons from the hadronic stage, and to partonic rates. Finally, the impact of considering the finite width of the ρ meson is investigated, where a significant enhancement of photon production in the low-energy region is observed. This benchmark is the first step toward a consistent treatment of photon emission in hybrid hydrodynamics + transport approaches and toward a genuine dynamical description.

Research Organization:
Stony Brook Univ., NY (United States); State Univ. of New York (SUNY), Albany, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE
Grant/Contract Number:
FG02-88ER40388
OSTI ID:
1610125
Alternate ID(s):
OSTI ID: 1546319
Journal Information:
Physical Review D, Vol. 99, Issue 11; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Figures / Tables (15)