ISOSPIN CORRELATIONS IN HIGH-ENERGY HEAVY-ION COLLISIONS

[摘要] We study the possibility of large isospin fluctuations in high-energy heavy-ioncollisions by assuming that pions are produced semiclassically both directly and in pairsthrough the isovector channel. The leading-particle effect and the factorization propertyof the scattering amplitude in the impact parameter space are used to define the classicalpion field. In terms of the joint probability function P_II3(n₀,n) for producing n₀ neutral and n negative pions from a definite isospinstate II₃ of the incoming leading-particle system we calculate the two-pioncorrelation parameters f_2,n ⁰ and the average number ofneutral pions ( n_{0 n}) as a function of negative pions (n ) produced. We show that onlydirect production of pions without isovector pairs leads to large isospin fluctuations.

[学科分类] 物理（综合）