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Single-spin azimuthal asymmetry in exclusive electroproduction of pi+ mesons on transversely polarized protons

Exclusive electroproduction of pi+ mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetry with respect to target polarization was measured as a function of the Mandelstam variable t, the Bjorken scaling variable x_B, and the virtuality Q^2 of the exchanged photon. The extracted Fourier components of the asymmetry were found to be consistent with zero, except one that was found to be large and that involves interference of contributions from longitudinal and transverse virtual photons.

preprint2009arXivOpen access
HERMES Collaboration
hep-ex
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Open access1 author1 topic
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