High-multiplicity pA collisions and the small-x effective action

2002/10/29 by Adrian Dumitru, A. Dumitru, Dumitru, A.
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0210412

6 Pages, 3 Figures; Presented at the Workshop on Coherent Effects at RHIC and LHC: Initial Conditions and Hard Probes'', ECT*, Trento (Italy), October 14-25, 2002, http://pluto.mpi-hd.mpg.de/trento

arxiv created 2002/10/29 · openalex publication_date 2002/10/29 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

I discuss the p_t distributions for high-multiplicity events originating from semi-classical variation of the gluon density of the proton.The multiplicity distribution measures the curvature of the effective action for the small-x gluon fields. For pA collisions at the RHIC and LHC colliders, semi-classically the multiplicity distribution reflects the distribution of saturation momenta of the proton but not that of the nucleus. The average transverse momentum in the central region grows with dN/dy, while the p_t distribution of leading hadrons in the proton fragmentation region should depend less on the multiplicity in the central region.

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