Single target-spin asymmetries in semi-inclusive pion electroproduction on longitudinally polarized protons
A. M. Kotzinian, K. A. Oganessyan, H. R. Avakian, E. De Sanctis
TL;DR
This paper analyzes single target-spin azimuthal asymmetries in semi-inclusive pion electroproduction on polarized protons, demonstrating that twist-2 functions suffice to match experimental data under HERMES conditions.
Contribution
It provides a theoretical evaluation of azimuthal asymmetries using twist-2 functions, aligning well with experimental results without requiring higher-twist contributions.
Findings
Good agreement with HERMES data
Twist-2 functions are sufficient for modeling asymmetries
Supports the dominance of leading-twist effects in the kinematic regime
Abstract
We evaluate the single target-spin sin(phi_h) and sin(2\phi_h) azimuthal asymmetries in the semi-inclusive deep inelastic lepton scattering off longitudinally polarized proton target under HERMES kinematic conditions. A good agreement with the HERMES data can be achieved using only the twist-2 distribution and fragmentation functions.
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