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Double-spin cos(phi) Asymmetry in Semi-inclusive Electroproduction

K. A. Oganessyan, P. J. Mulders, E. De Sanctis

hep-pharXiv:hep-ph/0201061

Abstract

We consider the double-spin cos(phi) asymmetry for pion electroproduction in semi-inclusive deep inelastic scattering of longitudinally polarized leptons off longitudinally polarized protons. We estimate the size of the asymmetry in the approximation where all twist-3 interaction-dependent distribution and fragmentation functions are set to zero. In that approximation at HERMES kinematics a sizable negative cos(phi) double-spin asymmetry for pi+ electroproduction is predicted.

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