Two flavor QCD and Confinement

M. D'Elia, A. Di Giacomo, Claudio Pica

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Abstract

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.
OriginalsprogEngelsk
TidsskriftPhysical Review D
Vol/bind72
Udgave nummer11
Sider (fra-til)114510
Antal sider27
ISSN2470-0010
DOI
StatusUdgivet - 22. mar. 2005

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