- Main
Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering
- Christy, ME;
- Gautam, T;
- Ou, L;
- Schmookler, B;
- Wang, Y;
- Adikaram, D;
- Ahmed, Z;
- Albataineh, H;
- Ali, SF;
- Aljawrneh, B;
- Allada, K;
- Allison, SL;
- Alsalmi, S;
- Androic, D;
- Aniol, K;
- Annand, J;
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- Averett, T;
- Gayoso, C Ayerbe;
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- Gramolin, AV;
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- Hauenstein, F;
- Hernandez, AV;
- Henry, W;
- Higinbotham, DW;
- Holmstrom, T;
- Horn, T;
- Huang, Y;
- Huber, GM;
- Hyde, C;
- Ibrahim, H;
- Israel, N;
- Jen, C-M;
- Jin, K;
- Jones, M;
- Kabir, A;
- Karki, B;
- Keppel, C;
- Khachatryan, V;
- King, PM;
- Li, S;
- Li, W;
- Liu, H;
- Liu, J;
- Liyanage, AH;
- 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, LS;
- Nadel-Turonski, P;
- Nazeer, SJ;
- Nelyubin, V;
- Nguyen, D;
- Nuruzzaman, N;
- Nycz, M;
- Obrecht, RF;
- Ohanyan, K;
- Palatchi, C;
- Pandey, B;
- Park, K;
- Park, S;
- Peng, C;
- Persio, FD;
- Pomatsalyuk, R;
- Pooser, E;
- Puckett, AJR;
- Punjabi, V;
- Quinn, B;
- Rahman, S;
- Rashad, MNH;
- Reimer, PE;
- Riordan, S;
- Roche, J;
- Sapkota, I;
- Sarty, A;
- Sawatzky, B;
- Saylor, NH;
- Shabestari, MH;
- Shahinyan, A;
- Širca, S;
- Smith, GR;
- 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, GM;
- Voutier, E;
- Waidyawansa, B;
- Wojtsekhowski, B;
- Wood, S;
- Yan, X;
- Ye, L;
- Ye, ZH;
- Yero, C;
- Zhang, J;
- Zhao, YX;
- Zhu, P
- et al.
Published Web Location
https://doi.org/10.1103/physrevlett.128.102002Abstract
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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