Perpustakaan Digital ITB

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.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.