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Dlamini, M.; Karki, B.; Ali, S. F.; Lin, P-J.; Israel, N.; Rashad, M. N. H.; Ahmed, Z.; Albataineh, H.; Androic, D.; Aniol, K.; Annand, J.; Atac, H.; Ayerbe Gayoso, C.; Barcus, S.; Bartlett, K.; Beminiwattha, R.; Bericic, J.; Bulumulla, D.; Castellano, J.; Chen, J-P.; Chetry, T.; Christy, M. E.; Cisbani, E.; Clary, B.; Compton, N.; Covrig Dusa, S.; Crowe, B.; Danley, T.; De Persio, F.; Deconinck, W.; Di, D.; Duer, M.; Duran, B.; Ent, R.; Fanelli, C.; Franklin, G.; Gautam, T.; Glamazdin, O.; Gray, V. M.; Hamad, G.; Hamilton, K.; Hansen, O.; Hauenstein, F.; Higinbotham, D. W.; Holmstrom, T.; Hyde, C.; Ibrahim, H.; Jen, C-M.; Jones, M.; Keppel, C.; King, P. M.; Liu, J.; Liu, H.; Liyanage, A.; Malace, S.; Mammei, J.; Markowitz, P.; McClellan, E.; Meddi, F.; Meekins, D.; Michaels, R.; Montgomery, R.; Muñoz Camacho, C.; Myers, L. S.; Nguyen, D.; Nuruzzaman, N.; Obretch, O. F.; Ou, L.; Palatchi, C.; Pandey, B.; Park, K.; Peng, C.; Pomatsalyuk, R.; Pooser, E.; Puckett, A. J. R.; Punjabi, V.; Reimer, P. E.; Sapkota, I.; Sarty, A.; Sawatzky, B.; Schmookler, B.; Shabestari, M. H.; Shahinyan, A.; Smith, G. R.; Sooriyaarachchilage, S.; Sparveris, N.; Su, T.; Subedi, A.; Sulkosky, V.; Tian, Y.; Urciuoli, G. M.; Voutier, E.; Waidyawansa, B.; Wojtsekhowski, B.; Wood, S.; Yan, X.; Ye, Z.; Yero, C.; Zhao, Y.; Zhu, P.
Physical review letters, 10/2021, Volume: 127, Issue: 15Journal Article
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d\sigma_L/dt+\epsilon d\sigma_T/dt$, $d\sigma_{TT}/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{LT'}/dt$ are extracted as a function of the proton momentum transfer $t-t_{min}$. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross-section throughout this kinematic range. The data are well described by calculations based on transversity Generalized Parton Distributions coupled to a helicity flip Distribution Amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.
