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

Abstract

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 $\Theta$ $\ne$ 0 state. However, an initial $\Theta$ $\ne$ 0 state, if formed in heavy ion collision, can survive, as a coherent superposition of a number of modes.

6 pages, 6 figures

References in corpus (5)

• Pionic Measures of Parity and CP Violation in High Energy Nuclear Collisions
• Can Induced Theta Vacua be Created in Heavy Ion Collisions?
• Discussing the possibility of observation of parity violation in heavy ion collisions
• Resonant decay of parity odd bubbles in hot hadronic matter
• On possible $\Theta$ vacua states in heavy ion collisions

Cited by in corpus (5)

• The Chiral Magnetic Effect
• The effects of topological charge change in heavy ion collisions: "Event by event P and CP violation"
• Parity violation in hot QCD: why it can happen, and how to look for it
• Charge separation induced by P-odd bubbles in QCD matter
• Implications of CP-violating transitions in hot quark matter on heavy ion collisions