학술논문
Beam Spin Asymmetry Measurements of Deeply Virtual $\pi^0$ Production with CLAS12
Document Type
Working Paper
Author
Kim, A.; Diehl, S.; Joo, K.; Kubarovsky, V.; Achenbach, P.; Akbar, Z.; Alvarado, J. S.; Armstrong, Whitney R.; Atac, H.; Avakian, H.; Gayoso, C. Ayerbe; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benkel, B.; Bianconi, A.; Biselli, A. S.; Bondi, M.; Bossù, F.; Boiarinov, S.; Brinkmann, K. T.; Briscoe, W. J.; Brooks, W. K.; Bueltmann, S.; Burkert, V. D.; Capobianco, R.; Carman, D. S.; Carvajal, J. C.; 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.; DeVita, R.; Defurne, M.; Deur, A.; Dilks, C.; Djalali, C.; Dupre, R.; Egiyan, H.; Ehrhart, M.; ElAlaoui, A.; ElFassi, L.; Fegan, S.; Filippi, A.; Fogler, C.; Gavalian, G.; Gilfoyle, G. P.; Gosta, G.; Girod, F. X.; Glazier, D. I.; Golubenko, A. A.; Gothe, R. W.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hauenstein, F.; Hayward, T. B.; Heddle, D.; Hobart, A.; Holtrop, M.; Hung, Yu-Chun; Ilieva, Y.; Ireland, D. G.; Isupov, E.; Jo, H. S.; Johnston, R.; Joosten, S.; Khachatryan, M.; Khanal, A.; Kim, W.; Klimenko, V.; Kripko, A.; Kuhn, 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.; MunozCamacho, C.; Naidoo, P.; Neupane, K.; Nguyen, D.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Ouillon, M.; Pandey, P.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Paul, S. J.; Phelps, W.; Pilleux, N.; Pokhrel, M.; Poudel, J.; Price, J. W.; Prok, Y.; Radic, A.; Ramasubramanian, N.; Reed, Trevor; Richards, J.; Ripani, M.; Ritman, J.; Rossi, P.; Sabatié, 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.; Zurek, M.
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Abstract
The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $\pi^0$ production in a wide kinematic region with the photon virtualities $Q^2$ up to 8 GeV$^2$ and the Bjorken scaling variable $x_B$ 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 $\bar E_T$, which contains information on quark transverse spin densities in unpolarized and polarized nucleons and provides access to the proton'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.
Comment: arXiv admin note: substantial text overlap with arXiv:2210.14557
Comment: arXiv admin note: substantial text overlap with arXiv:2210.14557