Abstract
The nucleon sigma term of the isoscalar and isovector quark chromomagnetic dipole moments are essential inputs for the determination of the CP-odd pion-nucleon couplings induced by quark chromoelectric dipole moments. We demonstrate that the former can be mapped to the third moment of the nucleon twist-three chiral-odd distribution functions e^{q}(x) which are in principle measurable in semi-inclusive deep inelastic scattering processes. We perform a survey on existing model calculations as well as experimental data on e^{u}(x)+e^{d}(x) and derive a predicted range for the isoscalar chromomagnetic dipole moment sigma term.
Highlights
The nucleon sigma term of the isoscalar and isovector quark chromomagnetic dipole moments are essential inputs for the determination of the CP-odd pion-nucleon couplings induced by quark chromoelectric dipole moments
We demonstrate that the former can be mapped to the third moment of the nucleon twist-three chiral-odd distribution functions eqðxÞ which are in principle measurable in semiinclusive deep inelastic scattering processes
In this Letter we extend the idea above to the study of long-range CP-odd nuclear interactions induced by the dimension-5 quark chromoelectric dipole moment (CEDM) operators
Summary
The nucleon sigma term of the isoscalar and isovector quark chromomagnetic dipole moments are essential inputs for the determination of the CP-odd pion-nucleon couplings induced by quark chromoelectric dipole moments. We perform a survey on existing model calculations as well as experimental data on euðxÞ þ edðxÞ and derive a predicted range for the isoscalar chromomagnetic dipole moment sigma term.
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