1997/04/07 by Tamás S. Bíró, Tamas S. Biro, Carsten Greiner · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevlett.79.3138
published as Phys.Rev.Lett. 79 (1997) 3138-3141 · .tex and .eps files. 4 pages in PRL-format, uses twocolumn, revtex
arxiv created 1997/04/07 · openalex publication_date 1997/10/27 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Utilizing the Langevin equation for the linear \ensuremathσ model we investigate the interplay of friction and white noise on the evolution and stability of collective pionic fields in energetic heavy ion collisions. We find that the smaller the volume, the more stable transverse (pionic) fluctuations become on a homogeneous disoriented chiral field background (the average transverse mass 〈mt2〉 increases). On the other hand the variance of mt2 increases even more, so for a system thermalized in an initial volume of 10fm3 about 96% and even in 1000fm3 about 60% of the individual trajectories enter into unstable regions ( mt2<0) for a while during a rapid one-dimensional expansion ( \ensuremathτ0\phantom\rule0ex0ex=\phantom\rule0ex0ex1\phantom\rule0ex0exfm/c). In contrast the ensemble averaged solution in this case remains stable. This result supports the idea of looking for disoriented chiral condensate (DCC) formation in individual events.