Another solution to the puzzle of the direct photon elliptic flow

Abstract : The observed large elliptic flow of direct photons is a puzzle in relativistic heavy ion physics. Our previous work provided a possibility to this puzzle with the delayed formation of the quark gluon plasma (QGP) in relativistic heavy ion collisions. In this work, we got the measured transverse momentum spectra, elliptic flow v2 and triangular flow v3 of direct photons from Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC) energy \sqrt s_NN = 200 GeV with all centrality classes explained at the same time without any additional parameter to EPOS3, a hydrodynamic model which can successfully reproduce hadronic data such as rapidity distributions, transverse momenta, elliptic flows and triangular flows from variuos collision systems. The key point is that, EPOS3 has an initial space eccentricity similar to other models, however, a stronger radial flow and a weaker momentum eccentrcity made a good description to the flows of both hadrons and direct photons. The created QGP matter seems discrete than a soup.
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http://hal.in2p3.fr/in2p3-01317957
Contributor : Sylvie Flores <>
Submitted on : Thursday, May 19, 2016 - 9:01:15 AM
Last modification on : Friday, January 11, 2019 - 10:39:30 AM

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  • HAL Id : in2p3-01317957, version 1
  • ARXIV : 1512.08833

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Fu-Ming Liu, Sheng-Xu Liu, Klaus Werner. Another solution to the puzzle of the direct photon elliptic flow. 2016. ⟨in2p3-01317957⟩

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