Calculation of Neutron EDM in quenched and full QCD

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dc.creatorShintani, E.
dc.creatorAoki, S.
dc.creatorIshizuka, N.
dc.creatorKanaya, K.
dc.creatorKuramashi, Y.
dc.creatorOkawa, M.
dc.creatorUkawa, A.
dc.creatorYoshié, T.
dc.date2006-10-03
dc.date.accessioned2026-07-07T10:41:23Z
dc.date.available2026-07-07T10:41:23Z
dc.descriptionWe report on a direct lattice calculation of the neutron EDM(NEDM) using the external electric field method in both quenched and full QCD. In quenched QCD, we use a $24^3\times 32$ lattice at $β=2.6$ with the Iwasaki gauge action and the clover fermion action to examine the viability of this method. In particular we investigate possible effects of violation of the periodic boundary condition of the external electric field on the NEDM signal. We also study the quark mass dependence of NEDM in quenched QCD, and observe that NEDM seems to remain non-zero toward the chiral limit because of the quenched artifact. In 2-flavor full QCD we employ configurations generated by the CP-PACS collaboration on a $24^3\times 48$ lattice at $β=2.1$ with the same gluon and quark actions as in the quenched case. Since the number of configurations is limited, we employ 8 different source points per one configuration and take an average over them. Our preliminary result at three quark masses ($m_{PS}/m_V\simeq 0.81, 0.76, 0.69$) indicates that non-zero value for NEDM can be obtained in full QCD. Statistical errors, however, are still too large to show the theoretically expected behaviour for NEDM in full QCD that it vanishes in the chiral limit.
dc.description7 pages, 15 figures, a talk given at the XXIV International Symposium on Lattice Field Theory (Lattice 2006, Hadronic Interactions and Structure), Tucson, Arizona, USA, July 23-28, 2006
dc.identifierhttps://arxiv.org/abs/hep-lat/0610022
dc.identifierhttp://arxiv.org/abs/hep-lat/0610022
dc.identifierPoSLAT2006:123,2006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181606
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCalculation of Neutron EDM in quenched and full QCD
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