Transverse Flow of Gluon Fields in Heavy Ion Collision

[摘要] We describe the dynamics of initial gluon fields in heavy ion collision using a formal recursive solution of the Yang Mills equations and solving for the energy momentum tensor analytically in a boost-invariant setup. We generalize the original McLerran-Venugopalan (MV) model in order to allow for realistic nuclear profiles. This leads to a transverse flow of gluon fields. This flow pattern is inherited by the quark gluon plasma fluid after thermalization. Its most interesting aspect is a rapidity-odd flow component. We show that this rapidity-odd flow does not break boost invariance and that it emerges naturally from the Yang Mills equations. It leads to directed flow of particles and introduces angular momentum to the system.

[发布机构] Cyclotron Institute, Department of Physics and Astronomy, Texas A and M University, College Station; TX; 77843, United States^1

[关键词] Directed flow;Energy-momentum tensor;Heavy ion collision;Quark-gluon plasma;Recursive solutions;Thermalization;Transverse flow;Yang-Mills equation