Thermal photon $v_3$ at LHC from fluctuating initial conditions

Abstract

We calculate the triangular flow parameter $v_3$ of thermal photons for 0--40\% central collisions of Pb nuclei at LHC using an event-by-event hydrodynamic model with fluctuating initial conditions. Thermal photon $v_3$ with respect to the the participant plane angle is found to be positive and significant compared to the elliptic flow parameter $v_2$ of thermal photons. In addition, photon $v_3$ as a function of $p_T$ shows similar qualitative nature to photon $v_2$ in the region $1<p_T<6$ GeV/$c$. We argue that while $v_3$ originates from ${\epsilon }_3$ deformations of the initial state density distribution, fast buildup of radial flow due to fluctuations is the main driving mechanism for the observed large value.

arXiv comment4 pages, talk given at the XXIV International Conference on Ultra-Relativistic Nucleus Nucleus Collisions (Quark Matter 2014), 19-24 May, Darmstadt, Germany

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• Direct real photons in relativistic heavy ion collisions
• Ratio of photon anisotropic flow in relativistic heavy ion collisions
• Relations and radicals in abstract lattices and in lattices of subspaces of Banach spaces and ideals of Banach algebras. Amitsur's theory revisited