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

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Abstract

Exclusive electroproduction of π + 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. © 2009 Elsevier B.V. All rights reserved.

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Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avetissian, A., … Zupranski, P. (2010). Single-spin azimuthal asymmetry in exclusive electroproduction of π + mesons on transversely polarized protons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 682(4–5), 345–350. https://doi.org/10.1016/j.physletb.2009.11.039

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