학술논문
Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering
Document Type
Working Paper
Author
Christy, M. E.; Gautam, T.; Ou, L.; Schmookler, B.; Wang, Y.; Adikaram, D.; Ahmed, Z.; Albataineh, H.; Ali, S. F.; Aljawrneh, B.; Allada, K.; Allison, S. L.; Alsalmi, S.; Androic, D.; Aniol, K.; Annand, J.; Arrington, J.; Atac, H.; Averett, T.; Gayoso, C. Ayerbe; Bai, X.; Bane, J.; Barcus, S.; Bartlett, K.; Bellini, V.; Beminiwattha, R.; Bericic, J.; Bhatt, H.; Bhetuwal, D.; Biswas, D.; Brash, E.; Bulumulla, D.; Camacho, C. M.; Campbell, J.; Camsonne, A.; Carmignotto, M.; Castellanos, J.; Chen, C.; Chen, J-P.; Chetry, T.; Cisbani, E.; Clary, B.; Cohen, E.; Compton, N.; Cornejo, J. C.; Dusa, S. Covrig; Crowe, B.; Danagoulian, S.; Danley, T.; Deconinck, W.; Defurne, M.; Desnault, C.; Di, D.; Dlamini, M.; Duer, M.; Duran, B.; Ent, R.; Fanelli, C.; Fuchey, E.; Gal, C.; Gaskell, D.; Georges, F.; Gilad, S.; Glamazdin, O.; Gnanvo, K.; Gramolin, A. V.; Gray, V. M.; Gu, C.; Habarakada, A.; Hague, T.; Hamad, G.; Hamilton, D.; Hamilton, K.; Hansen, O.; Hauenstein, F.; Hernandez, A. V.; Henry, W.; Higinbotham, D. W.; Holmstrom, T.; Horn, T.; Huang, Y.; Huber, G. M.; Hyde, C.; Ibrahim, H.; Israel, N.; Jen, C-M.; Jin, K.; Jones, M.; Kabir, A.; Karki, B.; Keppel, C.; Khachatryan, V.; King, P. M.; Li, S.; Li, W.; Liu, H.; Liu, J.; Liyanage, A. H.; Mack, D.; Magee, J.; Malace, S.; Mammei, J.; Markowitz, P.; Mayilyan, S.; McClellan, E.; Meddi, F.; Meekins, D.; Mesick, K.; Michaels, R.; Mkrtchyan, A.; Moffit, B.; Montgomery, R.; Myers, L. S.; Nadel-Turonski, P.; Nazeer, S. J.; Nelyubin, V.; Nguyen, D.; Nuruzzaman, N.; Nycz, M.; Obrecht, R. F.; Ohanyan, K.; Palatchi, C.; Pandey, B.; Park, K.; Park, S.; Peng, C.; Persio, F. D.; Pomatsalyuk, R.; Pooser, E.; Puckett, A. J. R.; Punjabi, V.; Quinn, B.; Rahman, S.; Rashad, M. N. H.; Riordan, S.; Roche, J.; Sapkota, I.; Sarty, A.; Sawatzky, B.; Saylor, N. H.; Shabestari, M. H.; Shahinyan, A.; Sirca, S.; Smith, G. R.; Sooriyaarachchilage, S.; Sparveris, N.; Spies, R.; Stefanko, A.; Su, T.; Subedi, A.; Sulkosky, V.; Sun, A.; Tan, Y.; Thorne, L.; Ton, N.; Tortorici, F.; Trotta, R.; Uniyal, R.; Urciuoli, G. M.; Voutier, E.; Waidyawansa, B.; Wojtsekhowski, B.; Wood, S.; Yan, X.; Ye, L.; Ye, Z. H.; Yero, C.; Zhang, J.; Zhao, Y. X.; Zhu, P.
Source
Phys. Rev. Lett. 128, 102002 (2022)
Subject
Language
Abstract
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q$^2$) up to 15.75~\gevsq. Combined with existing data, these provide an improved extraction of the proton magnetic form factor at high Q$^2$ and double the range over which a longitudinal/transverse separation of the cross section can be performed. The difference between our results and polarization data agrees with that observed at lower Q$^2$ and attributed to hard two-photon exchange (TPE) effects, extending to 8~(GeV/c)$^2$ the range of Q$^2$ for which a discrepancy is established at $>$95\% confidence. We use the discrepancy to quantify the size of TPE contributions needed to explain the cross section at high Q$^2$.
Comment: 7 pages, 2 figures
Comment: 7 pages, 2 figures