Analytic estimates from large-Nc QCD, the chiral quark model, and next-to-leading-order chiral perturbation theory indicate the strange tensor charge in the neutron is of order 0.1 to 0.3 of the valence charges, contradicting lattice QCD values.
Hadronic EDMs induced by the strangeness and constraints on supersymmetric CP phases
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abstract
We consider hadronic CP violation induced by chromoelectric dipolemoments (CEDMs) of light quarks and the QCD theta parameter ($?overline{?theta}$). We concentrate on the strange quark CEDM especially in this paper. Using effective CP violating nucleon interactions induced by the CEDMs and $?overline{?theta}$ with the SU(3) chiral Lagrangian technique, we calculate the EDMs for the $^{199}$Hg atom, neutron and deuteron. We also discuss supersymmetric contributions to the electric dipole moments with the mass insertion approximations and give stringent constraints on the CP phases of the flavor changing SUSY breaking terms.
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A strange contribution to the neutron EDM
Analytic estimates from large-Nc QCD, the chiral quark model, and next-to-leading-order chiral perturbation theory indicate the strange tensor charge in the neutron is of order 0.1 to 0.3 of the valence charges, contradicting lattice QCD values.