Measurement of Beam-Spin Asymmetries for Deep Inelastic ${\pi }^{+}$ 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 $\sin \varphi$ modulation increases with the momentum of the pion relative to the virtual photon, $z$, with an average amplitude of $0.038\pm 0.005\pm 0.003$ for $0.5<z<0.8$ range.

5 pages, RevTEX4, 3 figures, 2 tables

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