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

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

2001-01-11

arxiv.org/abs/hep-ph/0101115v2

Phys.Lett. B512 (2001) 297-304

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version, small changes for publication

Scientific paper

10.1016/S0370-2693(01)00712-2

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.

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