A phenomenological study on the ϕₕ azimuthal asymmetry in double longitudinally Polarized SIDIS

الأصل · EN

We study the ϕₕ azimuthal asymmetry in double polarized semi-inclusive pion production by considering dynamical twist-3 effects. In particular, we evaluate the role of the transverse momentum dependent distributions eₗ(x, kₜ²) and gₗ⊥(x, kₜ²) on the asymmetry. Using two different sets of spectator model results for these distributions, we predict the ϕₕ asymmetry of π+, π-, and π⁰ at the kinematic configuration available at CLAS, HERMES and COMPASS. Our estimates show that the asymmetries are positive for all the pions and could be accessed by CLAS and HERMES. We also find that gₗ⊥ gives the dominant contribution to the ϕₕ asymmetry, while the contribution of eₗ is almost negligible.