Neutron electric dipole moment on the lattice

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dc.creatorShintani, Eigo
dc.creatorAoki, S.
dc.creatorIshizuka, N.
dc.creatorKanaya, K.
dc.creatorKikukawa, Y.
dc.creatorKuramashi, Y.
dc.creatorOkawa, M.
dc.creatorUkawa, A.
dc.creatorYoshié, T.
dc.date2005-09-26
dc.date.accessioned2026-07-07T13:08:02Z
dc.date.available2026-07-07T13:08:02Z
dc.descriptionWe carry out a feasibility study toward a lattice QCD calculation of the neutron electric dipole moment (NEDM) in the presence of the $θ$ term using two different approaches. In the first method, we calculate the CP-odd electromagnetic form factor $F_3$, which becomes the NEDM in the zero momentum transfer limit. At the first order in $θ$, we derive a formula connecting the lattice three-point function to the CP-odd electromagnetic form factor. In the second method we directly extract the NEDM from the energy difference between spin-up and spin-down neutron states in the presence of a constant electric field, without expanding a small but non-zero $θ$. We test both approaches numerically, employing the domain-wall quark action with the RG improved gauge action in quenched QCD at $a^{-1}\simeq 2$ GeV on a $16^3\times 32\times 16$ lattice, and further applying the second method to the clover quark action at a similar lattice spacing and nucleon mass. We obtain good signals from both approaches. In particular the second method works well with both fermion formulations.
dc.description6 pages, 7 eps-figures, talk presented at Lattice 2005 (Chiral fermions), Trinity College, Dublin, Ireland, 25-30 Jul 2005
dc.identifierhttps://arxiv.org/abs/hep-lat/0509123
dc.identifierhttp://arxiv.org/abs/hep-lat/0509123
dc.identifierPoS LAT2005 (2005) 128
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/228291
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleNeutron electric dipole moment on the lattice
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