Measurement of Beam-Spin Asymmetries for Deep Inelastic $π^+$ Electroproduction

CLAS Collaboration; H. Avakian

Paper

Measurement of Beam-Spin Asymmetries for Deep Inelastic $π^+$ Electroproduction

Abstract

We report the first evidence for a non-zero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic region. Data have been obtained using a polarized electron beam of 4.3 GeV with the CLAS detector at the Thomas Jefferson National Accelerator Facility (JLab). The amplitude of the

modulation increases with the momentum of the pion relative to the virtual photon,

, with an average amplitude of

for

range.