Predictions for azimuthal asymmetries in pion and kaon production in SIDIS off a longitudinally polarized deuterium target at HERMES

Abstract

Predictions are made for azimuthal asymmetries in pion and kaon production from SIDIS off a longitudinally polarized deuterium target for HERMES kinematics, based on information on the 'Collins fragmentation function' from DELPHI data and on predictions for the transversity distribution function from non-perturbative calculations in the chiral quark-soliton model. There are no free parameters in the approach, which has been already successfully applied to explain the azimuthal asymmetries from SIDIS off polarized proton targets observed by HERMES and SMC.

Semi-inclusive deep inelastic scattering at small transverse momentum

“…[18,19,20] receive contributions not only from F sin φ h U L , but at the same order in 1/Q also from F sin(φ h −φ S ) U T,T and F sin(φ h +φ S ) U T (see also the phenomenological studies of Refs. [59,60,61,62,63,64,65]). In Ref.…”

Sivers and Collins single spin asymmetries

“…For the longitudinal target SSA in SIDIS, which were observed first [27,28] but are dominated by subleading-twist effects [29,30], the situation is less clear and their description (presuming factorization holds) is more involved.…”

Azimuthal single spin asymmetries in SIDIS in the light of chiral symmetry breaking

“…This means that the approach considered in this work describes the x-dependence of the azimuthal single spin asymmetries measured at HERMES with a longitudinally polarized target similarly well as the approach of Refs. [22,23], and predicts numerically similar effects for CLAS longitudinal and HERMES transverse target polarization experiments [48,49].…”