From QFT to a disoriented chiral condensate

Abstract

A quantum field theoretical model for the dynamics of the disoriented chiral condensate is presented. A unified approach to relate the quantum field theory directly to the formation, decay, and signals of the DCC and its evolution is taken. We use a background field analysis of the [Formula Presented] sigma model, keeping one-loop quantum corrections (quadratic order in the fluctuations). An evolution of the quantum fluctuations in an external, expanding metric which simulates the expansion of the plasma is carried out. We examine, in detail, the amplification of the low-momentum pion modes with two competing effects: the expansion rate of the plasma and the transition rate of the vacuum configuration from a metastable state into a stable state. We show the effect of DCC formation on the multiplicity distributions and the Bose-Einstein correlations. © 2004 The American Physical Society.