Hannu Holopainen

Elliptic flow of thermal photons from an event-by-event hydrodynamic model

Elliptic flow of direct photons in relativistic heavy ion collisions is believed to be dominated by contribution from thermal radiation of quark gluon plasma up to

Systematics of the charged-hadron P_T spectrum and the nuclear suppression factor in heavy-ion collisions from

p_T

GeV to

\sim 5

\sqrt{s}=2.76

GeV/

TeV

c

Enhancement of thermal photon production in event-by-event hydrodynamics

, although other sources start outshining the thermal contribution at already smaller values of

Multiplicities and

p_T

p_T

in the direct photon spectrum. The elliptic flow of thermal photons from ideal hydrodynamics considering a smooth initial density distribution under-predicts the PHENIX direct photon data from 200A GeV Au+Au collisions at RHIC by a large margin in the range

spectra in ultrarelativistic heavy ion collisions from a next-to-leading order improved perturbative QCD + saturation + hydrodynamics model

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