Beam-spin asymmetries from semi-inclusive pion electroproduction

Gohn, W. et al. (2014) Beam-spin asymmetries from semi-inclusive pion electroproduction. Physical Review D, 89(7), 072011. (doi:10.1103/PhysRevD.89.072011)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevD.89.072011

Abstract

We have measured the moment AsinϕLU corresponding to the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering. AsinϕLU is a twist-3 quantity providing information about quark-gluon correlations. Data were taken with the CLAS Spectrometer at Jefferson Lab using a 5.498 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels (π+, π0 and π−) were measured simultaneously over a large range of kinematics within the virtuality range Q2≈ 1.0–4.5  GeV2. The observable was measured with better than 1% statistical precision over a large range of z, PT, xB, and Q2, which permits comparison with several reaction models. The discussed measurements provide an upgrade in statistics over previous measurements, and serve as the first evidence for the negative sign of the π− sinϕ moment.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and MacGregor, Professor I and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Anderson, Mr Mark and Ireland, Professor David and Rosner, Professor Guenther
Authors: Gohn, W., Avakian, H., Joo, K., Ungaro, M., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Anderson, M. D., Anefalos Pereira, S., Ball, J., Baltzell, N. A., Battaglieri, M., Biselli, A. S., Bono, J., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fleming, J. A., Forest, T., Garçon, M., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gothe, R. W., Griffioen, K. A., Guegan, B., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hyde, C., Ilieva, Y., Ireland, D.G., Ishkhanov, B. S., Jo, H. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mirazita, M., Mokeev, V., Movsisyan, A., Nadel-Turonski, P., Niccolai, S., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Peng, P., Phillips, J. J., Pisano, S., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Puckett, A. J. R., Raue, B. A., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Simonyan, A., Smith, G. D., Sober, D. I., Sokhan, D., Stoler, P., Strakovsky, I. I., Stepanyan, S., Strauch, S., Tang, W., Tkachenko, S., Vernarsky, B., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zonta, I.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
ISSN (Online):1550-2368

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