13,152 research outputs found
The phase diagram in the SU(3) Nambu-Jona-Lasinio model with 't Hooft and eight-quark interactions
It is shown that the endpoint of the first order transition line which merges
into a crossover regime in the phase diagram of the Nambu--Jona-Lasinio model,
extended to include the six-quark 't Hooft and eight-quark interaction
Lagrangians, is pushed towards vanishing chemical potential and higher
temperatures with increasing strength of the OZI-violating eight-quark
interactions. We clarify a connection between the location of the endpoint in
the phase diagram and the mechanism of chiral symmetry breaking at the quark
level. Constraints on the coupling strengths based on groundstate stability and
physical considerations are explained.Comment: 5 pages, 3 figures, prepared for the proceedings of Hadron 2009 -
XIII International Conference on Hadron Spectroscopy, November 29 - December
4, Florida State University (USA
The Polyakov-Nambu-Jona-Lasinio model with six and eight quark interactions
The extension of the Nambu-Jona-Lasino Model with six and eight quark
interactions to include the Polyakov loop is analysed. Several interesting
features are determined to be an effect of the choice of the regularization
procedure. The use of a Pauli-Villars covariant regularization enables a
coherent and correct description of several quantities.Comment: 3 pages, 6 figures, to appear in the conference proceedings for Quark
Confinement and the Hadron Spectrum IX, August 30- September 3 2010, Madrid
(Spain
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