We study chiral and UA(1) phase transition in the dilute gas approximation. A comprehensive analysis of the mass and mixing angel of η and η′ reveals that in the transition of the quark-gluon-plasma droplets to the hadrons, besides the chiral phase transition, the UA(1) phase transition also plays a significant and non-trivial role. © 1999 Elsevier Science B.V. All rights reserved.

Bijan Kumar Bagchi

Physics

(SoNS) School of Natural Sciences

S. Sen

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