Anisotropic flow of thermal photons as a quark-gluon plasma viscometer

Shen, Chun; Heinz, Ulrich; Paquet, Jean-François; Kozlov, Igor; Gale, Charles

doi:10.1103/PhysRevC.91.024908

Title: Anisotropic flow of thermal photons as a quark-gluon plasma viscometer

Journal Article · Thu Feb 19 00:00:00 EST 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.91.024908· OSTI ID:1604548

Shen, Chun ^[1];

^[2]; Paquet, Jean-François ^[3]; Kozlov, Igor ^[3]; Gale, Charles ^[3]

McGill Univ., Montreal, QC (Canada); The Ohio State Univ., Columbus, OH (United States)
The Ohio State Univ., Columbus, OH (United States)
McGill Univ., Montreal, QC (Canada)

We present state-of-the-art calculations of viscous photon emission from nuclear collisions at the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC). Fluctuating initial density profiles are evolved with event-by-event viscous hydrodynamics. Momentum spectra of thermal photons radiated by these explosively expanding fireballs and their p_T-differential anisotropic flow coefficients v_n (p_T) are computed, both with and without accounting for viscous corrections to the standard thermal emission rates. Viscous corrections to the rates are found to have a larger effect on the v n coefficients than the viscous suppression of hydrodynamic flow anisotropies. The benefits of taking the ratio of elliptic to triangular flow, v₂/v₃, are discussed, and the space-time regions that contribute dominantly to the photon flow harmonics are identified. The directed flow v₁ of thermal photons is predicted for the energies currently available at the RHIC and the LHC.

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Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0002486; SC0004104; SC0004286

OSTI ID:: 1604548

Alternate ID(s):: OSTI ID: 1180008

Journal Information:: Physical Review C, Nuclear Physics, Vol. 91, Issue 2; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 51 works

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