Abstract
We calculate the triangular flow parameter of thermal photons from an event-by-event ideal hydrodynamic model for 0–40% central collisions of Pb nuclei at TeV at the CERN Large Hadron Collider. determined with respect to the participant plane (PP) is found to be nonzero and positive, and its dependence is qualitatively similar to the elliptic flow parameter (PP) of thermal photons in the range . In the range , (PP) is found to be about 50–75% of (PP) and for the two anisotropy parameters become comparable. The value of is driven by local density fluctuations both directly via the creation of triangular geometry and indirectly via additional flow. As expected, the triangular flow parameter calculated with respect to the reaction plane (RP) is found to be close to zero. We show that (PP) strongly depends on the spatial size of fluctuations, especially in the higher region where a larger value of results in a smaller . In addition, is found to increase with the assumed formation time of the thermalized system.
- Received 1 February 2014
- Revised 11 May 2016
DOI:https://doi.org/10.1103/PhysRevC.94.014903
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