Anomaly Induced Domain Formation of Disoriented Chiral Condensates

Details Anomaly Induced Domain Formation of Disoriented Chiral Condensates Anomaly Induced Domain Formation of Disoriented Chiral Condensates

1998-05-08

arxiv.org/abs/hep-ph/9805261v1

Phys.Rev. D58 (1998) 094011

Physics

High Energy Physics

High Energy Physics - Phenomenology

53 pages (REVTEX), 21 figures. Some figures are in color. To see figures in color, in particular for Figs. 4, 5, 17-19, is hel

Scientific paper

10.1103/PhysRevD.58.094011

We discuss the effect of chiral anomaly as a possible mechanism for triggering formation of domains of disoriented chiral condensate (DCC) in relativistic heavy ion collisions. The anomalous $\pi^0 \to 2 \gamma$ coupling and the strong, Lorentz contracted electromagnetic fields of the heavy ions combine to produce the ``anomaly kick'' to the field configuration of the neutral pion field. We implement the effect of anomaly kick in our numerical simulation of the linear sigma model in a schematic way which preserves its characteristic features: the effect is coherent over a large region of space but is opposite in sign above and below the ion scattering plane. We demonstrate by detailed simulations with longitudinal expansion that the DCC domain formation is dramatically enhanced by the anomaly kick in spite of its small absolute magnitude. We examine the behavior of various physical quantities such as pion fields, the axial vector currents, and their correlation functions. Our results also provide useful insight into the mechanism and properties of DCC domain formation, in general. Finally, we discuss some experimental observables which can signal the anomaly induced formation of DCC.

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