Beam Spin Asymmetry Measurements of Deeply Virtual $π$0 Production with CLAS12

Kim, A.; Diehl, S.; Joo, K.; Kubarovsky, V.; Achenbach, P.; Akbar, Z.; Alvarado, J. S.; Armstrong, Whitney R.; Atac, H.; Avakian, H.; Ayerbe Gayoso, C.; 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.; 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. 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.; .J.D. MacGregor, I.; 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.; 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.

doi:10.1016/j.physletb.2024.138459

Title: Beam Spin Asymmetry Measurements of Deeply Virtual $$π$$⁰ Production with CLAS12

Journal Article · Wed Jan 17 00:00:00 EST 2024 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2024.138459· OSTI ID:2282144

^[1]; Diehl, S.; Joo, K.; Kubarovsky, V.; Achenbach, P.; Akbar, Z.; Alvarado, J. S.; Armstrong, Whitney R.; Atac, H.; Avakian, H.; Ayerbe Gayoso, C.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benkel, B.; Bianconi, A.; Biselli, A. S.; Bondi, M.; Bossù, F.; Boiarinov, S. more »

University of Connecticut, Storrs, CT (United States); The CLAS Collaboration. et al.

The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $$π$$⁰ production in a wide kinematic region with the photon virtualities $$Q$$² up to 8 GeV² and the Bjorken scaling variable $$x$$_$$B$$ in the valence regime. The data were collected by the CE BAF 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 $$\overline{E}$$_$$T$$, 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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: The CLAS Collaboration

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 2282144

Report Number(s):: JLAB-PHY-23-3880; arXiv:2307.07874; DOE/OR/23177-6624

Journal Information:: Physics Letters. B, Vol. 849; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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