학술논문
Deep exclusive electroproduction of $\pi^0$ at high $Q^2$ in the quark valence regime
Document Type
Working Paper
Author
The Jefferson Lab Hall A Collaboration; Dlamini, M.; Karki, B.; Ali, S. F.; Lin, P-J.; Georges, F.; Ko, H-S; Israel, N.; Rashad, M. N. H.; Stefanko, A.; Adikaram, D.; Ahmed, Z.; Albataineh, H.; Aljawrneh, B.; Allada, K.; Allison, S.; Alsalmi, S.; Androic, D.; Aniol, K.; Annand, J.; Atac, H.; Averett, T.; Gayoso, C. Ayerbe; Bai, X.; Bane, J.; Barcus, S.; Bartlett, K.; Bellini, V.; Beminiwattha, R.; Bericic, J.; Biswas, D.; Brash, E.; Bulumulla, D.; Campbell, J.; Camsonne, A.; Carmignotto, M.; Castellano, J.; Chen, C.; Chen, J-P.; Chetry, T.; Christy, M. E.; Cisbani, E.; Clary, B.; Cohen, E.; Compton, N.; Cornejo, J. C.; Dusa, S. Covrig; Crowe, B.; Danagoulian, S.; Danley, T.; De Persio, F.; Deconinck, W.; Defurne, M.; Desnault, C.; Di, D.; Duer, M.; Duran, B.; Ent, R.; Fanelli, C.; Franklin, G.; Fuchey, E.; Gal, C.; Gaskell, D.; Gautam, T.; Glamazdin, O.; Gnanvo, K.; Gray, V. M.; Gu, C.; Hague, T.; Hamad, G.; Hamilton, D.; Hamilton, K.; Hansen, O.; Hauenstein, F.; Henry, W.; Higinbotham, D. W.; Holmstrom, T.; Horn, T.; Huang, Y.; Huber, G. M.; Hyde, C.; Ibrahim, H.; Jen, C-M.; Jin, K.; Jones, M.; Kabir, A.; Keppel, C.; Khachatryan, V.; King, P. M.; Li, S.; Li, W.; Liu, J.; Liu, H.; Liyanage, A.; Magee, J.; Malace, S.; Mammei, J.; Markowitz, P.; McClellan, E.; Meddi, F.; Meekins, D.; Mesik, K.; Michaels, R.; Mkrtchyan, A.; Montgomery, R.; Camacho, C. Munoz; Myers, L. S.; Nadel-Turonski, P.; Nazeer, S. J.; Nelyubin, V.; Nguyen, D.; Nuruzzaman, N.; Nycz, M.; Obretch, O. F.; Ou, L.; Palatchi, C.; Pandey, B.; Park, S.; Park, K.; Peng, C.; Pomatsalyuk, R.; Pooser, E.; Puckett, A. J. R.; Punjabi, V.; Quinn, B.; Rahman, S.; Reimer, P. E.; Roche, J.; Sapkota, I.; Sarty, A.; Sawatzky, B.; Saylor, N. H.; Schmookler, B.; Shabestari, M. H.; Shahinyan, A.; Sirca, S.; Smith, G. R.; Sooriyaarachchilage, S.; Sparveris, N.; Spies, R.; Su, T.; Subedi, A.; Sulkosky, V.; Sun, A.; Thorne, L.; Tian, Y.; Ton, N.; Tortorici, F.; Trotta, R.; Urciuoli, G. M.; Voutier, E.; Waidyawansa, B.; Wang, Y.; Wojtsekhowski, B.; Wood, S.; Yan, X.; Ye, L.; Ye, Z.; Yero, C.; Zhang, J.; Zhao, Y.; Zhu, P.
Source
Phys. Rev. Lett. 127, 152301 (2021)
Subject
Language
Abstract
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.