Measurement of beam-spin asymmetries for [Formula Presented] electroproduction above the baryon resonance region

H. Avakian, V. D. Burkert, L. Elouadrhiri, N. Bianchi, G. Adams, A. Afanasev, P. Ambrozewicz, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Audit, T. Auger, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, M. BellisN. Benmouna, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. K. Brooks, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. DeSanctis, R. DeVita, P. V. Degtyarenko, H. Denizli, L. Dennis, K. V. Dharmawardane, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, M. Eckhause, H. Egiyan, K. S. Egiyan, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, S. J. Gaff, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, C. Gordon, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, M. M. Ito

Research output: Contribution to journalArticle

Abstract

We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction [Formula Presented] have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the [Formula Presented] modulation increases with the momentum of the pion relative to the virtual photon, z. In the range [Formula Presented] the average amplitude is [Formula Presented] for a missing mass [Formula Presented] and [Formula Presented] for [Formula Presented] © 2004 The American Physical Society.
Original languageEnglish
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
DOIs
Publication statusPublished - 1 Jan 2004
Externally publishedYes

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    Avakian, H., Burkert, V. D., Elouadrhiri, L., Bianchi, N., Adams, G., Afanasev, A., Ambrozewicz, P., Anciant, E., Anghinolfi, M., Armstrong, D. S., Asavapibhop, B., Audit, G., Auger, T., Bagdasaryan, H., Ball, J. P., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., ... Ito, M. M. (2004). Measurement of beam-spin asymmetries for [Formula Presented] electroproduction above the baryon resonance region. Physical Review D - Particles, Fields, Gravitation and Cosmology. https://doi.org/10.1103/PhysRevD.69.112004