Photon and dilepton production at the Facility for Proton and Anti-Proton Research and beam-energy scan at the Relativistic Heavy-Ion Collider using coarse-grained microscopic transport simulations

2015/12/31 by Stephan Endres, Hendrik van Hees, Marcus Bleicher
Physics and Astronomy · #Antiproton #Baryon #Collider #Heavy ion #High-Energy Particle Collisions Research #Ion #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Range (aeronautics) #Relativistic Heavy Ion Collider #Spectral line #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevc.93.054901

published as Phys. Rev. C 93, 054901 (2016) · 22 pages, 13 figures

openalex publication_date 2016/05/02 · arxiv created 2016/05/24 · arxiv updated 2016/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present calculations of dilepton and photon spectra for the energy range E_lab=2A\phantom\rule4.pt0exto\phantom\rule4.pt0ex35A\phantom\rule4pt0exGeV which will be available for the Compressed Baryonic Matter (CBM) experiment at the future Facility for Antiproton and Ion Research (FAIR). The same energy regime will also be covered by phase II of the beam-energy scan at the Relativistic Heavy-Ion Collider (RHIC-BES). Coarse-grained dynamics from microscopic transport calculations of the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model is used to determine temperature and chemical potentials, which allows for the use of dilepton and photon-emission rates from equilibrium quantum-field-theory calculations. The results indicate that nonequilibrium effects, the presence of baryonic matter, and the creation of a deconfined phase might show up in specific manners in the measurable dilepton invariant-mass spectra and in the photon transverse-momentum spectra. However, as the many influences are difficult to disentangle, we argue that the challenge for future measurements of electromagnetic probes will be to provide a high precision with uncertainties much lower than in previous experiments. Furthermore, a systematic study of the whole energy range covered by CBM at FAIR and RHIC-BES is necessary to discriminate between different effects, which influence the spectra, and to identify possible signatures of a phase transition.

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