Eight-quark interactions as a chiral thermometer

Details Eight-quark interactions as a chiral thermometer Eight-quark interactions as a chiral thermometer

2008-06-02

arxiv.org/abs/0806.0322v1

Indian J.Phys.85:813-818,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures, prepared for the proceedings of Quark Matter 2008 - 20th International Conference on Ultra-Relativistic Nu

Scientific paper

10.1007/s12648-011-0082-y

A NJL Lagrangian extended to six and eight quark interactions is applied to study temperature effects (SU(3) flavor limit, massless case), and (realistic massive case). The transition temperature can be considerably reduced as compared to the standard approach, in accordance with recent lattice calculations. The mesonic spectra built on the spontaneously broken vacuum induced by the 't Hooft interaction strength, as opposed to the commonly considered case driven by the four-quark coupling, undergoes a rapid crossover to the unbroken phase, with a slope and at a temperature which is regulated by the strength of the OZI violating eight-quark interactions. This strength can be adjusted in consonance with the four-quark coupling and leaves the spectra unchanged, except for the sigma meson mass, which decreases. A first order transition behavior is also a possible solution within the present approach.

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