Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-12-27
Physics
High Energy Physics
High Energy Physics - Lattice
17 pages, v2 some minor corrections, v3 some minor corrections, appendix rewritten, explanations are added in section C
Scientific paper
By using overlap Majorana fermions, the ${\cal N}=1$ chiral multiple can be formulated so that the supersymmetry is manifest and the vacuum energy is cancelled in the free limit, thanks to the bilinear nature of the free action. It is pointed out, however, that in this formulation the reflection positivity is violated in the bosonic part of the action, although it is satisfied in the fermionic part. It is found that the positivity of the spectral density of the bosonic two-point correlation function is ensured only for the spacial momenta $a | p_k | \lesssim 1.72$ $(k=1,2,3)$. It is then argued that in formulating ${\cal N}=1$ Wess-Zumino model with the overlap Majorana fermion, one may adopt a simpler nearest-neighbor bosonic action, discarding the free limit manifest supersymmetry. The model still preserves the would-be U(1)$_R$ symmetry and satisfies the reflection positivity.
Kikukawa Yoshio
Usui Kouta
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