T-odd quark–gluon–quark correlation function in the diquark model

Abstract

We study the transverse momentum dependent quark–gluon–quark correlation function. Using a spectator diquark model, we calculate the eight time-reversal-odd interaction-dependent twist-3 quark distributions appearing in the decomposition of the transverse momentum dependent quark–gluon–quark correlator. In order to obtain finite results, we assume a dipole form factor for the nucleon–quark–diquark coupling, instead of a point-like coupling. The results are compared with the time-reversal-odd interaction-independent twist-3 TMDs calculated in the same model.