DISORIENTED CHIRAL CONDENSATE AND CHARGE-NEUTRAL PARTICLE FLUCTUATIONSIN HEAVY-ION COLLISIONS

Fizika B (Zagreb)

VESNA MIKUTA-MARTINIS¹  MLADEN MARTINIS¹ 

关键词: heavy-ion collisions;    disoriented chiral condensate;    chiral pionbremsstrahlung;   

DOI  :  

学科分类：物理（综合）

来源: Fizika B: a journal of experimental and theoretical physics

【 摘 要 】

The possibility of large charge and isospin fluctuations of the disoriented chiralcondensate type (DCC-type) in high-energy heavy-ion collisions is studied within theframework of an unitary eikonal model. The factorization property of the scatteringamplitude in the impact-parameter space of the leading two-nucleon system is used to studysemiclassical production of pions in the central region. A classical source function of apion field in the impact-parameter space was related to the semiclassical solutions of theequation of motion of the nonlinear s-model coupled to quarkdegrees of freedom. A multi-pion exchange potential between two quarks is derived. It isshown that in the limit of soft chiral pion bremsstrahlung, the anomalously largefluctuations in the ratio of neutral to charged pions are obtained without involving DCCformation. We also show that the DCC-type fluctuations should be suppressed if a largenumber of pions was produced via r-type clusters.

【 授权许可】

Unknown