Vector-type four-quark interaction and its impact on QCD phase structure
- Department of Physics, Graduate School of Sciences, Kyushu University, Fukuoka 812-8581 (Japan)
- Department of Physics, Saga University, Saga 840-8502 (Japan)
- Department of Physics, Fukuoka University of Education, Munakata, Fukuoka 811-4192 (Japan)
Effects of the vector-type four-quark interaction on QCD phase structure are investigated in the imaginary chemical potential ({mu}) region, by using the Polyakov-loop extended Nambu-Jona-Lasinio model with the extended Z{sub 3} symmetry. We clarify analytically the Roberge-Weiss periodicity and symmetry properties of various quantities under the existence of a vector-type four-quark interaction. In the imaginary {mu} region, the chiral condensate and the quark-number density are sensitive to the strength of the interaction. Based on this result, we propose a possibility to determine the strength of the vector-type interaction, which largely affects QCD phase structure in the real {mu} region, by comparing the results of lattice simulations and effective model calculations in the imaginary {mu} region.
- OSTI ID:
- 21254352
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 7; Other Information: DOI: 10.1103/PhysRevD.78.076007; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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