The Boltzmann equation for gluons at early times after a heavy ion collision

A Boltzmann equation is given for the early stages of evolution of the gluon system produced in a head-on heavy ion collision. The collision term is taken from gluon-gluon scattering in the one-gluon approximation. 〈p⊥〉 and 〈pz2〉 are evaluated as a function of time using initial conditions taken from the McLerran–Venugopalan model.