Strong CP violation and the neutron electric dipole form factor

Kuckei, J.; Dib, Claudio O.; Faessler, Amand; Gutsche, Th.; Kovalenko, Sergey; Lyubovitskij, Valery E.; Pumsa-ard, Kem

doi:10.1134/s1063778807020160

Cited by 12 publications

(20 citation statements)

References 47 publications

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“…Note that the analytic result of the neutron EDM in NLO SU(2) [19] and SU(3) [16] ChPT suggests that higher order corrections are about 40%, and furthermore there is the additional uncertainty of the CPV πNN coupling [30][31][32].…”

Section: Discussionmentioning

confidence: 98%

Neutron and proton electric dipole moments fromNf=2+1domain-wall fermion lattice QCD

Shintani¹,

Blum²,

Izubuchi³

et al. 2016

Phys. Rev. D

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We present a lattice calculation of the neutron and proton electric dipole moments (EDM's) with N f = 2 + 1 flavors of domain-wall fermions. The neutron and proton EDM form factors are extracted from three-point functions at the next-to-leading order in the θ vacuum of QCD. In this computation, we use pion masses of 0.33 and 0.42 GeV and 2.7 fm 3 lattices with Iwasaki gauge action and a 0.17 GeV pion and 4.6 fm 3 lattice with I-DSDR gauge action, all generated by the RBC and UKQCD collaborations. The all-mode-averaging technique enables an efficient and high statistics calculation. Chiral behavior of lattice EDM's is discussed in the context of baryon chiral perturbation theory. In addition, we also show numerical evidence on the relationship of threeand two-point correlation functions with the local topological charge distribution.

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Section: Discussionmentioning

confidence: 98%

Neutron and proton electric dipole moments fromNf=2+1domain-wall fermion lattice QCD

Shintani¹,

Blum²,

Izubuchi³

et al. 2016

Phys. Rev. D

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“…The experimental upper limit on the neutron electric dipole moment (nEDM) implies a limit θ 10 −10 [4]. The closeness of the value of θ to zero is seen as a fine-tuning problem of the theory.…”

Section: The Strong Cp Problemmentioning

confidence: 99%

LHCb searches for the strong CP-violating decays η → ππ and η′ → ππ

Capriotti

2017

J. Phys.: Conf. Ser.

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Abstract.A search for the CP-violating strong decays η → π + π − and η (958) → π + π − has been performed using approximately 2.5 × 10 7 events of each of the decays at 90% confidence level are set on the branching fractions, B(η → π + π − ) < 1.6 × 10 −5 and B(η → π + π − ) < 1.8 × 10 −5 . The limit for the η decay is comparable with the existing one, while that for the η is a factor of three smaller than the previous limit.

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“…However, it is insufficient by several orders of magnitude to explain the size of the baryon asymmetry observed. One expects further beyond-the-SM CP-violating processes to enhance this effect [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%