FIZIKA B 8 (1999) 2, 401-406

LETTER TO THE EDITOR

RESTORATION OF CHIRAL SYMMETRY IN THE LINEAR SIGMA MODEL

HRVOJE NIKOLIĆ

Theoretical Physics Division, Ruđer Bošković Institute, P.O.B. 1016, HR-10001 Zagreb, Croatia

Received 8 January 1999; Accepted 19 July 1999

We study the chiral phase transition in the linear sigma model at nonzero temperature and baryon density with N_f ł 3 quark flavours and N_c colours. One-loop calculations for N_f = 3 predict a first-order phase transition at both m = 0 and m ą 0. We also compare the results with the already existing results for N_f = 2.

PACS numbers: 11.30.Qc 11.30.Rd 12.39.Fe 11.10.Wx
UDC 539.126

Keywords: linear sigma model, restoration of chiral symmetry, temperature, baryon density, three flavours

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