Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-02-07
Phys.Rev.C75:044903,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 4 figures; typos fixed; discussions expanded; we added a new section IV in which we argue that at high energies the
Scientific paper
10.1103/PhysRevC.75.044903
We argue that multi-particle production in high energy hadron and nuclear collisions can be considered as proceeding through the production of gluons in the background classical field. In this approach we derive the gluon spectrum immediately after the collision and find that at high energies it is parametrically enhanced by ln(1/x) with respect to the quasi-classical result (x is the Bjorken variable). We show that the produced gluon spectrum becomes thermal (in three dimensions) with an effective temperature determined by the saturation momentum Qs, T= c Qs/2pi during the time ~1/T; we estimate c=sqrt{2pi}/2 ~ 1.2. Although this result by itself does not imply that the gluon spectrum will remain thermal at later times, it has an interesting applications to heavy ion collisions. In particular, we discuss the possibility of Bose-Einstein condensation of the produced gluon pairs and estimate the viscosity of the produced gluon system.
Kharzeev Dmitri
Levin Eugene
Tuchin Kirill
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