Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering.
作者信息
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, Ayerbe Gayoso C, 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, Covrig Dusa S, 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, Reimer P E, Riordan S, Roche J, Sapkota I, Sarty A, Sawatzky B, Saylor N H, Shabestari M H, Shahinyan A, Širca 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
机构信息
Hampton University, Hampton, Virginia 23669, USA.
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
出版信息
Phys Rev Lett. 2022 Mar 11;128(10):102002. doi: 10.1103/PhysRevLett.128.102002.
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q^{2}) up to 15.75 (GeV/c)^{2}. 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 or 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}.
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