Twist-3 Formalism for Single Transverse Spin Asymmetry Reexamined: Semi-Inclusive Deep Inelastic Scattering

Hisato Eguchi, Yuji Koike, Kazuhiro Tanaka

We study the single spin asymmetry (SSA) for the pion production in semi-inclusive deep inelastic scattering, $e{p}^{\uparrow }\to e\pi X$, in the framework of the collinear factorization.…