engleski

Isospin Correlations in High-Energy Heavy-Ion Collisions

We study the possibility of large isospin fluctuations in high-energy heavy-ion collisions by assuming that pions are produced semiclassically both directly and in pairs through the isovector channel. The leading-particle effect and the factorization property of the scattering amplitude in the impact parameter space are used to define the classical pion field. In terms of the joint probability function PII3(n0, n ) for producing n0 neutral and n negative pions from a definite isospin state II3 of the incoming leading-particle system we calculate the two-pion correlation parameters f2, n 0 and the average number of neutral pions ( án0 ñ n ) as a function of negative pions (n ) produced. We show that only direct production of pions without isovector pairs leads to large isospin fluctuations.

isospin fluctuations; heavy-ion collisions; leading -particle effect

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