Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering

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 lon...

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Veröffentlicht in:	arXiv.org 2022-03
Hauptverfasser:	L Ou, Schmookler, B, Wang, Y, Adikaram, D, Aljawrneh, B, Allada, K, Allison, S L, Alsalmi, S, Androic, D, Aniol, K, Annand, J, Arrington, J, Atac, H, Averett, T, C Ayerbe Gayoso, Bai, X, Barcus, S, Bartlett, K, Beminiwattha, R, Bhatt, H, Biswas, D, Brash, E, Camacho, C M, Campbell, J, Camsonne, A, Carmignotto, M, Castellanos, J, Chen, C, Chetry, T, Cisbani, E, Cohen, E, Compton, N, Cornejo, J C, Crowe, B, Danagoulian, S, Danley, T, Deconinck, W, D Di, Duran, B, Ent, R, Gal, C, Glamazdin, O, Gnanvo, K, C Gu, Habarakada, A, Hague, T, Hamad, G, Hamilton, D, Hamilton, K, Hansen, O, Holmstrom, T, Horn, T, Huber, G M, Hyde, C, Israel, N, C-M, Jen, Keppel, C, Khachatryan, V, S Li, W Li, Liu, H, Mack, D, Mammei, J, Markowitz, P, McClellan, E, Mesick, K, Mkrtchyan, A, Myers, L S, Obrecht, R F, Palatchi, C, Pandey, B, Park, K, Peng, C, Persio, F D, Pooser, E, Punjabi, V, Rashad, M N H, Sapkota, I, Sarty, A, Sawatzky, B, Saylor, N H, Shahinyan, A, Sirca, S, Sooriyaarachchilage, S, Spies, R, Stefanko, A, T Su, Sun, A, Tan, Y, Ton, N, Tortorici, F, Trotta, R, Uniyal, R, Urciuoli, G M, Wood, S, Yan, X, L Ye, Yero, C, Zhao, Y X, Zhu, P
Format:	Artikel
Sprache:	eng
Schlagworte:	Confidence intervals Elastic scattering Exchanging Form factors Momentum transfer Photons Physics - High Energy Physics - Experiment Physics - Nuclear Experiment Proton scattering Scattering cross sections
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Zusammenfassung:	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\(^2\).
ISSN:	2331-8422
DOI:	10.48550/arxiv.2103.01842