Twist3QuarkOperator[p] or Twist3QuarkOperator[p,_,_] yields the 2-quark operator (p is momentum in the direction of the fermion number flow).
Twist3QuarkOperator[{p1,___}, {p2,___}, {p3, mu, a}] or Twist3QuarkOperator[p1,_,_, p2,_,_, p3,mu,a] yields the Quark-Quark-Gluon-operator, where p1 is the incoming quark, p2 the incoming antiquark and p3 denotes the (incoming) gluon momentum.
Twist3QuarkOperator[{p1,___}, {p2,___}, {p3, mu, a}, {p4, nu, b}] or Twist3QuarkOperator[p1,_,_, p2,_,_, p3,mu,a, p4, nu, b] gives the Quark-Quark-Gluon-Gluon-operator. The setting of the option Polarization (unpolarized: 0; polarized: 1) determines whether the unpolarized or polarized operator is returned.
Overview, Twist2QuarkOperator, Twist2GluonOperator.
Twist3QuarkOperator[p](-1)^m (\gamma \cdot \Delta ).\bar{\gamma }^5 (\Delta \cdot p)^{m-1}