Izlaganje sa skupa
Disoriented chiral condensate and charge-neutral particle fluctuations in heavy-ion collisions
Mladen Martinis
; Theoretical Physics Division, Ruđer Bošković Institute, P.O.B. 1016, 11001 Zagreb,CROATIA
Vesna Mikuta-Martinis
; Theoretical Physics Division, Ruđer Bošković Institute, P.O.B. 1016, 11001 Zagreb,CROATIA
Sažetak
The possibility of large charge and isospin fluctuations of the disoriented chiral condensate type (DCC-type) in high-energy heavy-ion collisions is studied within the framework of an unitary eikonal model. The factorization property of the scattering amplitude in the impact-parameter space of the leading two-nucleon system is used to study semiclassical production of pions in the central region. A classical source function of a pion field in the impact-parameter space was related to the semiclassical solutions of the equation of motion of the nonlinear s-model coupled to quark degrees of freedom. A multi-pion exchange potential between two quarks is derived. It is shown that in the limit of soft chiral pion bremsstrahlung, the anomalously large fluctuations in the ratio of neutral to charged pions are obtained without involving DCC formation. We also show that the DCC-type fluctuations should be suppressed if a large number of pions was produced via r-type clusters.
Ključne riječi
heavy-ion collisions; disoriented chiral condensate; chiral pion bremsstrahlung
Hrčak ID:
305690
URI
Datum izdavanja:
1.6.2004.
Posjeta: 400 *