Physics – High Energy Physics – High Energy Physics - Phenomenology
7 pages, 6 figures
Theta vacuum effects on the QCD phase structure in the \mu-T plane are studied by using the Polyakov-loop extended Nambu-Jona-Lasinio model and its extension, where \mu is the quark chemical potential and T is temperature, respectively. As the parameter \theta of the theta vacuum increases, the chiral transition becomes stronger. For large \theta, it eventually becomes first order even at zero \mu.
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