Jet quenching at intermediate RHIC energies

Abstract

The final state energy loss of fast partons penetrating a longitudinally expanding quark-gluon plasma of effective gluon rapidity density $d{N}^g/dy=650-800$ is evaluated and incorporated together with the multiple initial state Cronin scattering in the lowest order perturbative QCD hadron production formalism. Predictions for the neutral pion attenuation in central $Au+Au$ collisions at the intermediate RHIC energy of $\sqrt{s_{NN}}=62$ GeV relative to the binary collision scaled $p+p$ result are given. The quenching is found to be a factor of 2-3 with a moderate transverse momentum dependence and the attenuation of the away-side di-hadron correlation function is estimated to be 3-5 fold.

Discussion of the different approximations to 3+1D plasma expansion and their impact on the energy loss calculation is added. The relation between the quenching of the single and double inclusive spectra is also clarified and shown in the right panel of Figure 2. 7 pages, 2 figures

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