Twist-4 contributions to the azimuthal asymmetry in SIDIS

Yu-kun Song, Jian-hua Gao, Zuo-tang Liang +1

We calculate the differential cross section for the unpolarized semi-inclusive deeply inelastic scattering (SIDIS) process $e^{-}+N\to e^{-}+q+X$ in leading order (LO) of perturbative…