Enhanced Minijet Production in $A-A$ Collisions from Gluons with Large Transverse Momenta

Abstract

We find supersaturation for the intrinsic gluon distribution of nuclei, i.e. the low $x$ unintegrated nuclear gluon distribution peaks at intermediate transverse momenta $k_t=Q_s$ and vanishes at zero $k_t$. Taking into account the intrinsic transverse momenta of the gluons and the saturation scale $p_s$ of the produced gluons, we calculate the minijet cross section arising from gluon gluon scattering for RHIC energies. For central collisions at $\sqrt{s}=200GeV$ the saturation scale $p_s\approx 1.4$ GeV is larger due to intrinsic $k_t$ effects and increases with energy. Our theoretical results on charged particle multiplicity agree very well with the recent experimental data from RHIC.

revised version, small changes for publication

References in corpus (1)

• High $p_T$ Azimuthal Asymmetry in Non-central A+A at RHIC

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