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arXiv · 0705.1196

Effects of a multi-quark interaction on color superconducting phase transition in an extended NJL model

Kouji Kashiwa·Masayuki Matsuzaki·Hiroaki Kouno·Masanobu Yahiro
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Abstract

We study the interplay of the chiral and the color superconducting phase transitions in an extended Nambu--Jona-Lasinio model with a multi-quark interaction that produces the nonlinear chiral-diquark coupling. We observe that this nonlinear coupling adds up coherently with the ω^2 interaction to produce the chiral-color superconductivity coexistence phase or cancel each other depending on its sign. We discuss that large coexistence region in the phase diagram is consistent with the quark-diquark picture for the nucleon whereas its smallness is the prerequisite for the applicability of the Ginzburg-Landau approach.

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Kouji Kashiwa, Masayuki Matsuzaki, Hiroaki Kouno, Masanobu Yahiro. 2007-05-21. Effects of a multi-quark interaction on color superconducting phase transition in an extended NJL model. https://doi.org/10.1016/j.physletb.2007.08.071

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