6533b86ffe1ef96bd12ce8e7
RESEARCH PRODUCT
Influence of initial state fluctuations on the production of thermal photons
Hannu HolopainenHannu HolopainenHannu HolopainenRupa ChatterjeeKari J. EskolaKari J. EskolaThorsten RenkThorsten Renksubject
PhysicsNuclear and High Energy PhysicsRange (particle radiation)Particle physicsPhotonta114Nuclear Theory010308 nuclear & particles physicsHadronElliptic flowFOS: Physical sciences01 natural sciences7. Clean energySpectral lineNuclear physicsNuclear Theory (nucl-th)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciences010306 general physicsNucleonNuclear ExperimentGlauberQCD matterdescription
Inhomogeneities in the initial QCD matter density distribution increase the production of thermal photons significantly compared to a smooth initial-state-averaged profile in the region $p_T > 1$ GeV/$c$ in an ideal hydrodynamic calculation. This relative enhancement is more pronounced for peripheral collisions, for smaller size systems as well as for lower beam energies. A suitably normalized ratio of central-to-peripheral yield of thermal photons reduce the uncertainties in the hydrodynamical initial conditions and can be a useful parameter to study the density fluctuations and their size. The fluctuations in the initial density distribution also lead to a larger elliptic flow of thermal photons for $p_T >$ 2.0 GeV/$c$ compared to the flow from a smooth profile.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-10-12 |