TY - JOUR
T1 - Neutron electric dipole moment induced by strangeness revisited
AU - Fuyuto, Kaori
AU - Hisano, Junji
AU - Nagata, Natsumi
PY - 2013/3/18
Y1 - 2013/3/18
N2 - We have revisited the calculation of the neutron electric dipole moment in the presence of the CP-violating operators up to dimension 5 based on the chiral perturbation theory. In particular, we focus on the contribution of strangeness content. In the calculation, we extract the nucleon matrix elements of scalar-type quark operators from the results of the lattice QCD simulations, while those of the dipole-type quark-gluon operators are evaluated by using the method of the QCD sum rules. As a result, it is found that although the strangeness quantity in nucleons is small, the contribution of the chromoelectric dipole moment of strange quarks may still be sizable, and thus may offer a sensitive probe for the CP-violating interactions in physics beyond the Standard Model.
AB - We have revisited the calculation of the neutron electric dipole moment in the presence of the CP-violating operators up to dimension 5 based on the chiral perturbation theory. In particular, we focus on the contribution of strangeness content. In the calculation, we extract the nucleon matrix elements of scalar-type quark operators from the results of the lattice QCD simulations, while those of the dipole-type quark-gluon operators are evaluated by using the method of the QCD sum rules. As a result, it is found that although the strangeness quantity in nucleons is small, the contribution of the chromoelectric dipole moment of strange quarks may still be sizable, and thus may offer a sensitive probe for the CP-violating interactions in physics beyond the Standard Model.
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U2 - 10.1103/PhysRevD.87.054018
DO - 10.1103/PhysRevD.87.054018
M3 - Article
AN - SCOPUS:84875476696
SN - 1550-7998
VL - 87
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 5
M1 - 054018
ER -