The twist-3 collinear factorization framework has drawn much attention in recent decades as a successful approach in describing the data for single spin asymmetries (SSAs). Many SSAs data have been experimentally accumulated in a variety of energies since the first measurement was done in the late 1970s and it is expected that the future experiments like Electron-Ion-Collider will provide us with more data. In order to perform a consistent and precise description of the data taken in different kinematic regimes, the scale evolution of the collinear twist-3 functions and the perturbative higher-order hard part coefficients are mandatory. In this paper, we introduce the techniques for next-to-leading order (NLO) calculation of transverse-momentum-weighted SSAs, which can be served as a useful tool to derive the QCD evolution equation for twist-3 functions and to verify the QCD collinear factorization for twist-3 observables at NLO, as well as obtain the finite NLO hard part coefficients.

+More

ssas nexttoleading order nlo calculation of transversemomentumweighted ssas perturbative higherorder hard part coefficients twist3 collinear factorization framework single spin asymmetries scale evolution qcd evolution equation for twist3 functions

Hongxi Xing,Shinsuke Yoshida,.Introduction to the Transverse-Momentum-Weighted Technique in the Twist-3 Collinear Factorization Approach. 2019 (),.

Hongxi Xing,Shinsuke Yoshida,"Introduction to the Transverse-Momentum-Weighted Technique in the Twist-3 Collinear Factorization Approach" 2019

Hongxi Xing,Shinsuke Yoshida,"Introduction to the Transverse-Momentum-Weighted Technique in the Twist-3 Collinear Factorization Approach"