2005/03/08 by Thorsten Renk · 2 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevc.71.064905
published as Phys.Rev. C71 (2005) 064905 · 10 pages, 3 figures
arxiv created 2005/03/08 · openalex publication_date 2005/06/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Owing to the smallness of the electromagnetic coupling, photons escape from the hot and dense matter created in a heavy-ion collision at all times, in contrast to hadrons, which are predominantly emitted in the final freeze-out phase of the evolving system. Thus, the thermal photon yield carries an imprint from the early evolution. We suggest how this fact can be used to gain information on where the actual evolution can be found between the two limiting cases of Bj\orken (boost-invariant expansion) and Landau (complete initial stopping and re-expansion) hydrodynamics. We argue that both the rapidity dependence of the photon yield and photonic two-particle correlation radii are capable of answering this question.