Light tetraquark state at nonzero temperature

Abstract

We study the implications of a light tetraquark on the chiral phase transition at nonzero temperature $T$: The behavior of the chiral and four-quark condensates and the meson masses are studied in the scenario in which the resonance $f_0(600)$ is described as a predominantly tetraquark state. It is shown that the critical temperature is lowered and the transition softened. Interesting mixing effects between tetraquark, and quarkonium configurations take place.

Comments: 6 pages, 2 figures. Talk presented at the Excited QCD Workshop, 31.1.-6.2.2010, in Tatranska Lomnica (Slovakia)