D. Silvermyr

Centrality dependence of direct photon production in root s(NN) = 200 GeV Au+Au collisions.

The first measurement of direct photons in Au+Au collisions at {radical}(s{sub NN})=200 GeV is presented. The direct photon signal is extracted as a function of the Au+Au collision centrality and compared to next-to-leading order perturbative quantum chromodynamics calculations. The direct photon yield is shown to scale with the number of nucleon-nucleon collisions for all centralities.

Saturation of azimuthal anisotropy in Au+Au collisions at root s(NN) = 62 – 200 GeV.

New measurements are presented for charged hadron azimuthal correlations at midrapidity in

Inclusive cross section and double helicity asymmetry for pi^0 production in

\mathrm{Au}+\mathrm{Au}

p^+ p

collisions at

collisions at

\sqrt{{s}_{NN}}=62.4

\sqrt{s}=62.4

and 200 GeV. They are compared to earlier measurements obtained at

GeV

\sqrt{{s}_{NN}}=130\text{ }\text{ }\mathrm{GeV}

Cross section and double helicity asymmetry for eta mesons and their comparison to neutral pion production in p+p collisions at sqrt(s)=200 GeV

and in

Leptonic observables in ultra-relativistic heavy ion collisions

\mathrm{Pb}+\mathrm{Pb}

PHENIX measurement of jet properties and their modification in heavy-ion collisions.

collisions at