Dynamical simulation of disoriented chiral condensate formation in Bjorken rods
- Nuclear Science Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
Using a semiclassical treatment of the linear {sigma} model, we simulate the dynamical evolution of an initially hot cylindrical rod endowed with a longitudinal Bjorken scaling expansion (a ''Bjorken rod''). The field equation is propagated until full decoupling has occurred and the asymptotic many-body state of free pions is then obtained by a suitable Fourier decomposition of the field and a subsequent stochastic determination of the number of quanta in each elementary mode. The resulting transverse pion spectrum exhibits visible enhancements below 200 MeV due to the parametric amplification caused by the oscillatory relaxation of the chiral order parameter. Ensembles of such final states are subjected to various event-by-event analyses. The factorial moments of the multiplicity distribution suggest that the soft pions are nonstatistical. Furthermore, their emission patterns exhibit azimuthal correlations that have a bearing on the domain size in the source. Finally, the distribution of the neutral pion fraction shows a significant broadening for the soft pions which grows steadily as the number of azimuthal segments is increased. All of these features are indicative of disoriented chiral condensates and it may be interesting to apply similar analyses to actual data from high-energy nuclear collision experiments. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215386
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 61, Issue 2; Other Information: PBD: Feb 2000; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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