High-energy photons from quark-gluon plasma versus hot hadronic gas
Abstract
Photons in the energy range of about one-half to several GeV have been proposed as a signal of the formation of a quark-gluon plasma in high-energy collisions. To lowest order the thermal emission rate is infrared divergent for massless quarks, but we regulate this divergence using the resummation technique of Braaten and Pisarski. Photons can also be produced in the hadron phase. We find that the dominant contribution comes from the reactions $\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\rightarrow}\ensuremath{\rho}\ensuremath{\gamma}$ and $\ensuremath{\pi}\ensuremath{\rho}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\gamma}$; the decays $\ensuremath{\omega}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\gamma}$ and $\ensuremath{\rho}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\gamma}$ are also significant. Comparing the thermal emission rates at a temperature $T=200$ MeV we conclude that the hadron gas shines just as brightly as the quark-gluon plasma.
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Spinodal instabilities would result in the formation and growth of pion domains with distinct observational signatures in the pion distribution.
“Spinodal instabilities would result in the formation and growth of pion domains [142] with distinct observational signatures in the pion distribution.”
From Phase Transitions in the Early and Present Universe (2006) · cites this paper as [142]
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Alam, J., Srivastava, D. K., Sinha, B., & Basu, D. N. (1993) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.48.1117 · Cited by 67 · see citing works
Berges, J., Reygers, K. J., Tanji, N., & Raju Venugopalan, B. (2017) · Physical Review C · doi:10.1103/physrevc.95.054904 · Cited by 64 · see citing works
Pion and thermal photon spectra as a possible signal for a phase transition
Dumitru, A., Katscher, U., Maruhn, J. A., Horst Stöcker, B., Greiner, W., & Rischke, D. H. (1995) · Physical Review C · doi:10.1103/physrevc.51.2166 · Cited by 64 · see citing works
Low mass thermal dilepton production at NLO in a weakly coupled quark-gluon plasma
Ghiglieri, J., & Moore, G. D. (2014) · Journal of High Energy Physics · doi:10.1007/jhep12(2014)029 · Cited by 63 · see citing works
“The resulting processes, shown in figure 4, are leadingorder for quark momentum in the p ∈ [gT, T ] momentum range, and were traditionally assumed to give the leading-order photon production rate [19, 20].”
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Dilepton and photon emission rates from a hadronic gas. II
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Modelling relativistic heavy-ion collisions with dynamical transport approaches
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“These same modes contribute to the thermal photon and low-mass dilepton production rates already at leading order (LO) because of the infrared sensitivity of the t-channel exchange [3].”
BackgroundLattice constraints on the thermal photon rate
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1 Hydrodynamics and collective behaviour in relativistic nuclear collisions ∗Preprint
Rischke, D. H. (1996) · Cited by 54 · see citing works
- Authors
- Kapusta, J., Lichard, P., & Seibert, D.
- Affiliations
- University of Minnesota (US)
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 1991-11-01
- Volume
- 44
- Issue
- 9
- Pages
- 2774-2788
- ISSN
- 0556-2821 (ISSN-L)
- OpenAlex
- W2052222991
- Cited by
- 516
- References
- 24
- Citations by year
- 2026: 8 · 2025: 5 · 2024: 11 · 2023: 6 · 2022: 8 · 2021: 7 · 2020: 15 · 2019: 8 · 2018: 7 · 2017: 11 · 2016: 14 · 2015: 23 · 2014: 22 · 2013: 14 · 2012: 14
- FWCI
- 15.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (publishedVersion)
- PubMed (publishedVersion)
- Funders
- U.S. Department of Energy (DEFG0287ER40328)
- Topics
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › High-Energy Particle Collisions Research
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Quantum Chromodynamics and Particle Interactions
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Particle physics theoretical and experimental studies
- Keywords
- quark-gluon plasma, high-energy photons, thermal photon emission, hadron gas, infrared divergences, rho meson decay, omega meson decay, pion decay, quark-gluon plasma signatures, heavy-ion collisions
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