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arxiv: 1205.6545 · v1 · submitted 2012-05-30 · ✦ hep-lat

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Strong-coupling Analysis of Parity Phase Structure in Staggered-Wilson Fermions

Tatsuhiro Misumi , Takashi Z. Nakano , Taro Kimura , Akira Ohnishi
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classification ✦ hep-lat
keywords fermionsstaggered-wilsonlatticeparameterphasestrong-couplingfindlimit
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We study strong-coupling lattice QCD with staggered-Wilson fermions, with emphasis on discrete symmetries and possibility of their spontaneous breaking. We perform hopping parameter expansion and effective potential analyses in the strong-coupling limit. From gap equations we find nonzero pion condensate in some range of a mass parameter, which indicates existence of the parity-broken phase in lattice QCD with staggered-Wilson fermions. We also find massless pions and PCAC relations around 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 with the Wilson fermion.

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