Two flavor QCD and Confinement

Details Two flavor QCD and Confinement Two flavor QCD and Confinement

2005-03-22

arxiv.org/abs/hep-lat/0503030v1

Phys.Rev. D72 (2005) 114510

Physics

High Energy Physics

High Energy Physics - Lattice

46 pages, 20 eps figures, 9 tables, REVTeX4

Scientific paper

10.1103/PhysRevD.72.114510

We argue that the order of the chiral transition for N_f=2 is a sensitive probe of the QCD vacuum, in particular of the mechanism of color confinement. A strategy is developed to investigate the order of the transition by use of finite size scaling analysis. An in-depth numerical investigation is performed with staggered fermions on lattices with N_t=4 and N_s=12,16,20,24,32 and quark masses am_q ranging from 0.01335 to 0.307036. The specific heat and a number of susceptibilities are measured and compared with the expectations of an O(4) second order and of a first order phase transition. A second order transition in the O(4) and O(2) universality classes are excluded. Substantial evidence emerges for a first order transition. A detailed comparison with previous works is performed.

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