# DIS 2015 - XXIII. International Workshop on Deep-Inelastic Scattering and Related Subjects

27 April 2015 to 1 May 2015
US/Central timezone

## Transverse single-spin asymmetries $A_{UT}^{\sin\phi_S}$ and $A_{UT}^{\sin(2\phi_h -\phi_S)}$ in SIDIS

28 Apr 2015, 14:00
25m
BALLROOM EAST ()

WG6 Spin Physics

### Speaker

Wenjuan Mao (Southeast University)

### Description

We study the single-spin asymmetries with the $\sin\phi_S$ and $\sin(2\phi_h -\phi_S)$ angular dependencies of pion production in semi-inclusive deep inelastic scattering off a transversely polarized proton target. We investigate the role of the distributions $f_T$, $h_T$ and $h_T^\perp$ in the $\sin\phi_S$ asymmetry, as well as the role of the distributions $f_T^\perp$, $h_T$ and $h_T^\perp$ in the $\sin(2\phi_h -\phi_S)$ asymmetry. We calculate the four twist-3 distributions $f_T(x,\boldsymbol{k_T^2})$, $f_T^\perp(x,\boldsymbol{k_T^2})$, $h_T(x,\boldsymbol{k_T^2})$, and $h_T^\perp(x,\boldsymbol{k_T^2})$ in a spectator-diquark model including vector diquarks. With the model results on these TMD distributions, for the first time we predict the two corresponding asymmetries for $\pi^+$, $\pi^-$ and $\pi^0$ produced off the proton target at the kinematics of HERMES, JLab, and COMPASS.

### Primary author

Wenjuan Mao (Southeast University)

### Co-authors

Bo-Qiang Ma (Peking University) Zhun Lu (Southeast University)

 Slides