Baryonic Sources of Thermal Photons

Abstract

Thermal radiation of photons and dileptons from hadronic matter plays an essential role in understanding electromagnetic emission spectra in high-energy heavy-ion collisions. In particular, baryons and anti-baryons have been found to be strong catalysts for electromagnetic radiation, even at collider energies where the baryon chemical potential is small. Here, we conduct a systematic analysis of $\pi$- and $\omega$-meson-induced reactions off a large set of baryon states. The interactions are based on effective hadronic Lagrangians where the parameters are quantitatively constrained by empirical information from vacuum decay branchings and scattering data, and gauge invariance is maintained by suitable regularization procedures. The thermal emission rates are computed using kinetic theory but can be directly compared to previous calculations using hadronic many-body theory. The comparison to existing calculations in the literature reveals our newly identified contributions to be rather significant.

arXiv comment29 pages, 17 figures

References in corpus (23)

• Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results
• The production of photons in relativistic heavy-ion collisions
• Hadronic Production of Thermal Photons
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Low-Mass Dileptons at the CERN-SpS: Evidence for Chiral Restoration?
• Thermal Photons and Collective Flow at the Relativistic Heavy-Ion Collider
• Signatures of Thermal Dilepton Radiation at RHIC
• Evidence for the production of thermal muon pairs with masses above 1 GeV/c^2 in 158A GeV Indium-Indium Collisions
• Parameterization dependence of T matrix poles and eigenphases from a fit to piN elastic scattering data
• Pion-nucleon scattering in a meson-exchange model
• Pseudo-Critical Enhancement of Thermal Photons in Relativistic Heavy-Ion Collisions
• Centrality dependence of the direct photon yield and elliptic flow in heavy-ion collisions at sqrt(s)=200 GeV
• Direct real photons in relativistic heavy ion collisions
• Modifications of the Rho Meson from the Virtual Pion Cloud in Hot and Dense Matter
• Rho properties in a hot meson gas
• Momentum Dependence of the Pion Cloud for Rho Mesons in Nuclear Matter
• Dilepton and Photon Emission Rates from a Hadronic Gas II
• Universal Parametrization of Thermal Photon Rates in Hadronic Matter
• Coupling of Baryon Resonances to the $N\omega$ channel
• Thermal photon emission from the pi-rho-omega system
• Direct Photon Elliptic Flow at BNL Relativistic Heavy Ion Collider (RHIC) and CERN Large Hadron Collider (LHC)
• Medium Effects in rho-Meson Photoproduction
• pi^0 -> gamma gamma*, omega -> pi^0 gamma*, and rho -> pi gamma* decays in nuclear medium

Cited by in corpus (1)

• The Present and Future of QCD