$Θ$ vacua states in heavy ion collisions in presence of dissipation and noise

Details $Θ$ vacua states in heavy ion collisions in presence of dissipation and noise $Θ$ vacua states in heavy ion collisions in presence of dissipation and noise

2001-09-24

arxiv.org/abs/hep-ph/0109211v1

Phys.Rev. C65 (2002) 024906

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 6 figures

Scientific paper

10.1103/PhysRevC.65.024906

We have studied possible formation of $\Theta$ vacua states in heavy ion collisions. Random phases of the chiral fields were evolved in a finite temperature potential, incorporating the breaking of $U_A(1)$ symmetry. Initial random phases very quickly settle into oscillation around the values dictated by the potential. The simulation study indicate that an initial $\Theta$=0 state do not evolve into a $\Theta$ $\neq$ 0 state. However, an initial $\Theta$ $\neq$ 0 state, if formed in heavy ion collision, can survive, as a coherent superposition of a number of modes.

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