Phase structure of a generalized Nambu-Jona-Lasinio model with Wilson fermions in the mean-field or large-N expansion

Azcoiti, V. (Universidad de Zaragoza) ; Di Carlo, G. ; Follana, E. (Universidad de Zaragoza) ; Giordano, M. ; Vaquero, A.

Resumen: We analyze the vacuum structure of a generalized lattice Nambu-Jona-Lasinio model with two flavors of Wilson fermions, such that its continuum action is the most general four-fermion action with "trivial" color interactions, and having a SU(2)V×SU(2)A symmetry in the chiral limit. The phase structure of this model in the space of the two four-fermion couplings shows, in addition to the standard Aoki phases, new phases with <¿-¿5¿>¿0, in close analogy to similar results recently suggested by some of us for lattice QCD with two degenerate Wilson fermions. This result shows how the phase structure of an effective model for low-energy QCD cannot be entirely understood from Wilson Chiral Perturbation Theory, based on the standard QCD chiral effective Lagrangian approach.

Idioma: Inglés

DOI: 10.1016/j.nuclphysb.2013.07.001

Año: 2013

Publicado en: NUCLEAR PHYSICS B 875, 1 (2013), 45-62
ISSN: 0550-3213

Factor impacto JCR: 3.946 (2013)

Categ. JCR: PHYSICS, PARTICLES & FIELDS rank: 8 / 27 = 0.296 (2013) - Q2 - T1

Financiación: info:eu-repo/grantAgreement/ES/DGA/E24-2
Financiación: info:eu-repo/grantAgreement/EC/FP7/238353/EU/Strong Interaction Supercomputing Training Network/STRONGNET
Financiación: info:eu-repo/grantAgreement/ES/INFN–MICINN/AIC-D-2011-0663
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CPAN-CSD2007-00042
Financiación: info:eu-repo/grantAgreement/ES/MICINN/FPA2009-09638
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FPA2012-35453

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Teórica (Dpto. Física Teórica)