Lattice QCD with small number of flavours

Summary, in English

The finite temperature behaviour of lattice QCD with dynamical quarks for small number of flavours N_f is investigated. Simulations have been performed on lattices of size N³_σ·4 with N_σ=8 and 12 and staggered fermions of mass ma=0.1 using a hybrid algorithm. We find that the two state signal at the critical point of the pure gauge theory, which is taken as sign for a fiorst order phase transition, persists for the values of N_f we have investigated, namely N_f=0.5, 1 and 2. It is, however, considerably weaker for N_f=1 and 2. Moreover, for N_f=2 the discontinuity at β_c decreases with increasing lattice size. Thid puts doubt o order nature of the N_f=2 transition at intermediate masses.

• Author: A. Irbäck; F. Karsch; B. Petersson; H. W. Wyld
• Department/s: Department of Astronomy and Theoretical Physics - Undergoing reorganization
• Publishing year: 1989-01-05
• Language: English
• Pages: 177-183
• Publication/Series: Physics Letters B
• Volume: 216
• Issue: 1-2
• Links: http://dx.doi.org/10.1016/0370-2693(89)91391-9
• Document type: Journal article
• Publisher: Elsevier
• Topic: Condensed Matter Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0370-2693