Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

HERMES collaboration; A. Airapetian

Paper

Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

Abstract

Single-spin asymmetries have been measured for semi-inclusive electroproduction of

and

mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The asymmetries appear in the distribution of the hadrons in the azimuthal angle

around the virtual photon direction, relative to the lepton scattering plane. The corresponding analysing powers in the

moment of the cross section are

for

and

for

. The

moments are compatible with zero for all particles.