FIZIKA B 3 (1994) 3, 197-205

ISOSPIN CORRELATIONS IN HIGH-ENERGY HEAVY-ION COLLISIONS

MLADEN MARTINIS, VESNA MIKUTA-MARTINIS, ALFRED ŠVARC and JOSIP ČRNUGELJ
Department of Physics, Theory Division, Ruđer Bošković Institute, P.O.B. 1016, 41001 Zagreb, Croatia

Received 12 December 1994

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 P_II3(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 f_2,n ⁰ and the average number of neutral pions ( án₀ ń_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.

UDC 539.12
PACS 25.75.+r, 12.38.Mh, 13.85.Tp, 24.60.Ky

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