Lattice QCD with small number of flavours

A. Irbäck; F. Karsch; B. Petersson; H. W. Wyld

doi:10.1016/0370-2693(89)91391-9

Lattice QCD with small number of flavours

A. Irbäck, F. Karsch, B. Petersson, H. W. Wyld

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Abstract

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.

Original language	English
Pages (from-to)	177-183
Number of pages	7
Journal	Physics Letters B
Volume	216
Issue number	1-2
DOIs	https://doi.org/10.1016/0370-2693(89)91391-9
Publication status	Published - 1989 Jan 5

Subject classification (UKÄ)

Condensed Matter Physics (including Material Physics, Nano Physics)

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10.1016/0370-2693(89)91391-9

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abstract = "The finite temperature behaviour of lattice QCD with dynamical quarks for small number of flavours Nf is investigated. Simulations have been performed on lattices of size N3σ·4 with Nσ=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 Nf we have investigated, namely Nf=0.5, 1 and 2. It is, however, considerably weaker for Nf=1 and 2. Moreover, for Nf=2 the discontinuity at βc decreases with increasing lattice size. Thid puts doubt o order nature of the Nf=2 transition at intermediate masses.",

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T1 - Lattice QCD with small number of flavours

AU - Irbäck, A.

AU - Karsch, F.

AU - Petersson, B.

AU - Wyld, H. W.

PY - 1989/1/5

Y1 - 1989/1/5

N2 - The finite temperature behaviour of lattice QCD with dynamical quarks for small number of flavours Nf is investigated. Simulations have been performed on lattices of size N3σ·4 with Nσ=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 Nf we have investigated, namely Nf=0.5, 1 and 2. It is, however, considerably weaker for Nf=1 and 2. Moreover, for Nf=2 the discontinuity at βc decreases with increasing lattice size. Thid puts doubt o order nature of the Nf=2 transition at intermediate masses.

AB - The finite temperature behaviour of lattice QCD with dynamical quarks for small number of flavours Nf is investigated. Simulations have been performed on lattices of size N3σ·4 with Nσ=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 Nf we have investigated, namely Nf=0.5, 1 and 2. It is, however, considerably weaker for Nf=1 and 2. Moreover, for Nf=2 the discontinuity at βc decreases with increasing lattice size. Thid puts doubt o order nature of the Nf=2 transition at intermediate masses.

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Lattice QCD with small number of flavours

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