Thermal photons from fluctuating initial conditions
Rupa Chatterjee, Hannu Holopainen, Thorsten Renk, and Kari J. Eskola
TL;DR
This paper demonstrates that event-by-event fluctuations in initial conditions of heavy-ion collisions significantly increase thermal photon production, especially in peripheral collisions, due to early-time hotspot effects.
Contribution
It introduces the impact of initial density fluctuations on thermal photon yields in hydrodynamic models of heavy-ion collisions.
Findings
Fluctuations enhance photon production in 2-4 GeV/c range.
Hotspots cause early-time photon emission.
Effect is stronger in peripheral collisions.
Abstract
Event-by-event fluctuations of initial QCD-matter density produced in heavy-ion collisions at RHIC enhance the production of thermal photons significantly in the region GeV/ compared to a smooth initial-state averaged profile in the ideal hydrodynamic calculation. This enhancement is a an early time effect due to the presence of hotspots or over-dense regions in the fluctuating initial state. The effect of fluctuations is found to be stronger in peripheral than in central collisions.
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