Abstract
We estimate the single-spin asymmetries with [Formula: see text] and [Formula: see text] angular dependencies for electroproduction of pions in transversely polarized semi-inclusive DIS process. We consider the effect of the twist-3 transverse momentum dependent distributions which convoluted with twist-2 fragmentation functions. We calculate these distributions in a spectator-diquark model, and predict the corresponding single-spin asymmetries at the kinematics of HERMES, JLab and COMPASS. We find that the numerical estimates show that the asymmetries are sizable, and the T-odd twist-3 TMDs play an important role in these asymmetries.
Highlights
Transverse spin phenomena of the nucleon in scattering processes have attracted growing attentions in recent years, since they opened a new window on theThis is an Open Access article published by World Scientific Publishing Company
We find that the numerical estimates show that the asymmetries are sizable, and the T-odd twist-3 transverse momentum dependent (TMD) play an important role in these asymmetries
It will be quite necessary to give an attempt to investigate the roles of twist-3 transverse momentum dependent (TMD) distributions and fragmentation functions(FFs) in the transverse single-spin asymmetry (SSA), and to study the feasibility of experimental measurements on them
Summary
Transverse spin phenomena of the nucleon in scattering processes have attracted growing attentions in recent years, since they opened a new window on the. This is an Open Access article published by World Scientific Publishing Company. The transverse SSAs from the dynamical subleading-twist effects can shed light on the transverse spin structure of the nucleon at twist 3, there are still less systematic studies and calculations on the sin φS and sin (2φh − φS) asymmetries in literature, especially from a phenomenological point of view. It will be quite necessary to give an attempt to investigate the roles of twist-3 transverse momentum dependent (TMD) distributions and fragmentation functions(FFs) in the transverse SSAs, and to study the feasibility of experimental measurements on them. We will focus our attention on the contributions from the twist-3 TMDs, and set these FFs to zero in the Wandzura-Wilczek approximation[16] in the practical calculation
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