doi:10.1103/PhysRevLett.118.091601
ISI:000404769200001
Bartolini, Lorenzo
Bigazzi, Francesco
Bolognesi, Stefano
Cotrone, Aldo L.
Manenti, Andrea
Neutron Electric Dipole Moment from Gauge-String Duality
College Pk, Amer Physical Soc
We compute the electric dipole moment of nucleons in the large N-c QCD model by Witten, Sakai, and Sugimoto with N-f = 2 degenerate massive flavors. Baryons in the model are instantonic solitons of an effective five-dimensional action describing the whole tower of mesonic fields. We find that the dipole electromagnetic form factor of the nucleons, induced by a finite topological. angle, exhibits complete vector meson dominance. We are able to evaluate the contribution of each vector meson to the final result a small number of modes are relevant to obtain an accurate estimate. Extrapolating the model parameters to real QCD data, the neutron electric dipole moment is evaluated to be d(n) = 1.8 x 10(-16)theta e cm. The electric dipole moment of the proton is exactly the opposite.
2017-09-05T09:40:51Z
http://infoscience.epfl.ch/record/230811
http://infoscience.epfl.ch/record/230811
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