Transverse single-spin asymmetries of pion production in semi-inclusive DIS at subleading twist

Abstract

We study the single-spin asymmetries with the $\sin {\varphi }_S$ and $\sin (2{\varphi }_h-{\varphi }_S)$ angular dependences for charged and neutral pions produced in semi-inclusive deep inelastic scattering on the transversely polarized proton target. The theoretical interpretations of the two asymmetries are presented in terms of the convolution of the twist-3 quark transverse momentum dependent distributions and twist-2 fragmentation functions. Specifically, we investigate the role of the distributions $f_T$, $h_T$ and $h_T^{\perp }$ in the $\sin {\varphi }_S$ asymmetry, as well as the role of the distributions $f_T^{\perp }$, $h_T$ and $h_T^{\perp }$ in the $\sin (2{\varphi }_h-{\varphi }_S)$ asymmetry. We calculate these distributions in a spectator-diquark model and predict the corresponding asymmetries for the first time, considering the kinematics at HERMES, JLab and COMPASS. The numerical estimates show that the asymmetries are sizable, and the dominant contribution to the $\sin {\varphi }_S$ asymmetry comes from the T-odd distribution $f_T$, while $f_T^{\perp }$ gives the main contribution to the $\sin (2{\varphi }_h-{\varphi }_S)$ asymmetry. The future measurements on these asymmetries can shed light on the information of twist-3 transverse momentum dependent distributions.

11 pages, 12 figures, version published in PRD

References in corpus (9)

• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Transverse-momentum distributions in a diquark spectator model
• Matches and mismatches in the descriptions of semi-inclusive processes at low and high transverse momentum
• Transverse-Spin and Transverse-Momentum Effects in High-Energy Processes
• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• The transverse momentum dependent distribution functions in the bag model
• Towards an explanation of transverse single-spin asymmetries in proton-proton collisions: the role of fragmentation in collinear factorization
• Pretzelosity $h_{1T}^{\perp }$ and quark orbital angular momentum
• Light-cone divergence in twist-3 correlation functions

Cited by in corpus (3)

• Double Spin Asymmetries $A_{LT}^{\cos {\varphi }_S}$ and $A_{LT}^{\cos (2{\varphi }_h-{\varphi }_S)}$ in semi-inclusive DIS
• Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings
• Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model