The classical field created in early stages of high energy nucleus-nucleus collisions

Details The classical field created in early stages of high energy nucleus-nucleus collisions The classical field created in early stages of high energy nucleus-nucleus collisions

2008-06-09

arxiv.org/abs/0806.1422v1

Nucl.Phys.A818:97-119,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 3 figures

Scientific paper

10.1016/j.nuclphysa.2008.11.010

We show that a special choice of light-cone gauge can greatly simplify the calculation of the classical color field created in the initial stages of nucleus-nucleus collisions. Within this gauge, we can in particular construct explicitly the conserved color current and calculate exactly the gauge field immediately after the collision. This field is used as a boundary condition in an iterative solution of the Yang-Mills equations in the forward light-cone. In leading order, which corresponds to a linearization of the Yang-Mills equation in the forward light-cone, we obtain a simple formula for the spectrum of gluons produced in nucleus-nucleus collisions. This formula reproduces exactly the known formula for proton-nucleus collisions, where $k_t-$factorization is recovered, while the latter property apparently breaks down in the case of nucleus-nucleus collisions.

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