Strong-coupling analysis of parity phase structure in staggered-Wilson fermions

Tatsuhiro Misumi; Takashi Z. Nakano; Taro Kimura; Akira Ohnishi

doi:10.1103/PhysRevD.86.034501

Strong-coupling analysis of parity phase structure in staggered-Wilson fermions

Tatsuhiro Misumi, Takashi Z. Nakano, Taro Kimura, Akira Ohnishi

Faculty of Economics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We study strong-coupling lattice QCD with staggered-Wilson fermions, with an emphasis on discrete symmetries and the possibility of their spontaneous breaking. We perform hopping parameter expansion and effective potential analyses in the strong-coupling limit. From gap equations we find the nonzero pion condensate in some range of a mass parameter, which indicates the existence of the parity-broken phase in lattice QCD with staggered-Wilson fermions. We also find massless pions and PCAC relations around the second-order phase boundary. These results suggest that we can take a chiral limit by tuning a mass parameter in lattice QCD with staggered-Wilson fermions as we would with the Wilson fermion.

Original language	English
Article number	034501
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	86
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.86.034501
Publication status	Published - 2012 Aug 8

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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AB - We study strong-coupling lattice QCD with staggered-Wilson fermions, with an emphasis on discrete symmetries and the possibility of their spontaneous breaking. We perform hopping parameter expansion and effective potential analyses in the strong-coupling limit. From gap equations we find the nonzero pion condensate in some range of a mass parameter, which indicates the existence of the parity-broken phase in lattice QCD with staggered-Wilson fermions. We also find massless pions and PCAC relations around the second-order phase boundary. These results suggest that we can take a chiral limit by tuning a mass parameter in lattice QCD with staggered-Wilson fermions as we would with the Wilson fermion.

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