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

Tatsuhiro Misumi, Takashi Z. Nakano, Taro Kimura, and Akira Ohnishi
Phys. Rev. D 86, 034501 – Published 8 August 2012

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.

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  • Received 2 June 2012

DOI:https://doi.org/10.1103/PhysRevD.86.034501

© 2012 American Physical Society

Authors & Affiliations

Tatsuhiro Misumi*

  • Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

Takashi Z. Nakano

  • Department of Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

Taro Kimura

  • Mathematical Physics Laboratory, RIKEN Nishina Center, Saitama 351-0198, Japan

Akira Ohnishi§

  • Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

  • *tmisumi@bnl.gov
  • tnakano@yukawa.kyoto-u.ac.jp
  • tkimura@ribf.riken.jp
  • §ohnishi@yukawa.kyoto-u.ac.jp

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Issue

Vol. 86, Iss. 3 — 1 August 2012

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