期刊
PHYSICAL REVIEW C
卷 93, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.93.044906
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada
- DOE [DE-SC0012704]
- Marie Curie Intra-European Fellowship for Career Development Grant [FP7-PEOPLE-2013-IEF-626212]
- Canada Foundation for Innovation (CFI)
- NanoQuebec
- RMGA
- Fonds de recherche du Quebec-Nature et technologies (FRQ-NT)
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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.
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