2015/09/30 by Jean-François Paquet, Chun Shen, Gabriel S. Denicol +4 · 4 citations
Physics and Astronomy · #Anisotropy #Computational physics #High-Energy Particle Collisions Research #Materials science #Momentum (technical analysis) #Nuclear physics #Particle physics theoretical and experimental studies #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Shear (geology) #Thermal #Thermodynamics #Work (physics) #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.93.044906
published as Phys. Rev. C 93, 044906 (2016) · 17 pages, 13 figures. Augmented discussion; now also includes STAR photon data. Some typos corrected; agrees with published version
arxiv created 2016/04/13 · openalex publication_date 2016/04/18 · arxiv updated 2016/04/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
In this work it is shown that the use of a hydrodynamical model of heavy-ion collisions which incorporates recent developments, together with updated photon emission rates, greatly improves agreement with both ALICE and PHENIX measurements of direct photons, supporting the idea that thermal photons are the dominant source of direct photon momentum anisotropy. The event-by-event hydrodynamical model uses the impact parameter dependent Glasma model (IP-Glasma) initial states and includes, for the first time, both shear and bulk viscosities, along with second-order couplings between the two viscosities. The effect of both shear and bulk viscosities on the photon rates is studied, and those transport coefficients are shown to have measurable consequences on the photon momentum anisotropy.