Double-spin cos phi asymmetry in semi-inclusive electroproduction

摘要

We consider the double-spin cosphi 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 cosphi double-spin asymmetry for pi(+) electroproduction is predicted. (C) 2002 Published by Elsevier Science B.V. [References: 19]