Double Spin Asymmetry in Semi-inclusive Deep Inelastic Scattering

Abstract

We shortly review the various methods suggested for determining the transversity function. Among such methods, we consider especially those based on semi-inclusive deep inelastic scattering. In the framework of this kind of reactions, we propose to measure a double spin asymmetry, using a transversely polarized proton target and a longitudinally polarized lepton beam, and fixing the direction of the final pion. Under particular conditions, the asymmetry is sensitive to the transversity function.

Comments: Talk given at the Third Circum Pan-Pacific Symposium on High Energy Spin Physics, Beijing, China, Oct., 8-13, 2001