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

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

2003-01-06

arxiv.org/abs/hep-ex/0301005v2

Phys.Rev.D69:112004,2004

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, RevTEX4, 3 figures, 2 tables

Scientific paper

10.1103/PhysRevD.69.112004

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 $\sin\phi$ 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.

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