Beam spin asymmetry measurements of deeply virtual π0 production with CLAS12

Kim, A. et al. (2024) Beam spin asymmetry measurements of deeply virtual π0 production with CLAS12. Physics Letters B, 849, 138459. (doi: 10.1016/j.physletb.2024.138459)

Abstract

The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive pi0 production in a wide kinematic region with the photon virtualities Q2 up to 6.6 GeV2 and the Bjorken scaling variable xB in the valence regime. The data were collected by the CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab with longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable asymmetry values indicate a substantial contribution from transverse virtual photon amplitudes to the polarized structure functions. The interpretation of these measurements in terms of the Generalized Parton Distributions (GPDs) demonstrates their sensitivity to the chiral-odd GPD ET, which contains information on quark transverse spin densities in unpolarized and polarized nucleons and provides access to the nucleon's transverse anomalous magnetic moment. Additionally, the data were compared to a theoretical model based on a Regge formalism that was extended to the high photon virtualities.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Strakovsky, Professor Igor and Sokhan, Dr Daria and McKinnon, Dr Bryan and Naidoo, Paul and Wishart, Robert and Tyson, Mr Richard and Ireland, Professor David and MacGregor, Professor Ian and Fegan, Mr Stuart and Glazier, Dr Derek
• Authors: Kim, A., Diehl, S., Joo, K., Kubarovsky, V., Achenbach, P., Akbar, Z., Alvarado, J., Armstrong, W.R., Atac, H., Avakian, H., Ayerbe Gayoso, C., Barion, L., Battaglieri, M., Bedlinskiy, I., Benkel, B., Bianconi, A., Biselli, A.S., Bondi, M., Bossu, F., Boiarinov, S., Brinkmann, K.T., Briscoe, W.J., Brooks, W.K., Bueltmann, S., Burkert, V.D., Capobianco, R., Carman, D.S., Carvajal, C.J., Celentano, A., Charles, G., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clary, B., Clash, G., Cole, P.L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Dilks, C., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Fegan, S., Filippi, A., Fogler, C., Gavalian, G., Gilfoyle, G., Gosta, G., Girod, F.X., Glazier, D., Golubenko, A.A., Gothe, R.W., Guo, L., Hafidi, K., Hakobyan, H., Hattaway, M., Hauenstein, F., Hayward, T.B., Heddle, D., Hobart, A., Holtrop, M., Hung, Y.-C., Ilieva, Y., Ireland, D.G., Isupov, E., Jo, H.S., Johnston, R., Joosten, S., Khachatryan, M., Khandal, A., Kim, W., Klimenko, V., Kripko, A., Khun, S.E., Lanza, L., Leali, M., Kabir, M.L., Lee, S., Lenisa, P., Li, X., MacGregor, I.J.D., Marchand, D., Mascagna, V., McKinnon, B., Matamoros, D., Migliorati, S., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., Munoz Camacho, C., Naidoo, P., Neupane, K., Nguyen, D., Niccolai, S., Nicolescu, G., Osipenko, M., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L.L., Paremuzyan, R., Pasyuk, E., Paul, S., Phelps, W., Pilleux, N., Pokhrel, M., Poudel, J., Price, J.W., Prok, Y., Radic, A., Ramasubramanian, N., Reed, T., Richards, J., Ripani, M., Ritman, J., Rossi, P., Sabatie, F., Salgado, C., Schadmand, S., Schmidt, A., Sharabian, Y.G., Shirokov, E.V., Shrestha, U., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I.I., Strauch, S., Tan, J., Trotta, N., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D.P., Wei, X., Wishart, R., Wood, M.H., Yurov, M., Zachariou, N., Zhang, J., Ziegler, V., and Zurek, M.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Group: Nuclear and Hadron Physics
• Journal Name: Physics Letters B
• Journal Abbr.: Phys. Lett. B
• Publisher: Elsevier
• ISSN: 0370-2693
• ISSN (Online): 1873-2445
• Published Online: 17 January 2024
• Copyright Holders: Copyright © 2024 The Author(s).
• First Published: First published in Physics Letters B 849:138459
• Publisher Policy: Reproduced under a Creative Commons license