Neutron Electric Dipole Moment and Tensor Charges from Lattice QCD.
Phys Rev Lett
; 115(21): 212002, 2015 Nov 20.
Article
em En
| MEDLINE
| ID: mdl-26636847
ABSTRACT
We present lattice QCD results on the neutron tensor charges including, for the first time, a simultaneous extrapolation in the lattice spacing, volume, and light quark masses to the physical point in the continuum limit. We find that the "disconnected" contribution is smaller than the statistical error in the "connected" contribution. Our estimates in the modified minimal subtraction scheme at 2 GeV, including all systematics, are g_{T}^{d-u}=1.020(76), g_{T}^{d}=0.774(66), g_{T}^{u}=-0.233(28), and g_{T}^{s}=0.008(9). The flavor diagonal charges determine the size of the neutron electric dipole moment (EDM) induced by quark EDMs that are generated in many new scenarios of CP violation beyond the standard model. We use our results to derive model-independent bounds on the EDMs of light quarks and update the EDM phenomenology in split supersymmetry with gaugino mass unification, finding a stringent upper bound of d_{n}<4×10^{-28} e cm for the neutron EDM in this scenario.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Modelos Teóricos
/
Nêutrons
Tipo de estudo:
Prognostic_studies
/
Qualitative_research
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos