1. Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment
- Author
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Bernauer, J. C., Schmidt, A., Avetisyan, A., Beck, R., Belostotski, S., Bessuille, J., Brinker, F., Calarco, J. R., Carassiti, V., Cisbani, E., Ciullo, G., Contalbrigo, M., Henderson, B. S., De Leo, R., Diefenbach, J., Donnelly, T. W., Dow, K., Elbakian, G., Eversheim, P. D., Frullani, S., Funke, Ch., Gavrilov, G., Gläser, B., Ice, L. D., Görrissen, N., Hasell, D. K., Hauschildt, J., Hoffmeister, Ph., Holler, Y., Ihloff, E., Izotov, A., Kaiser, R., Karyan, G., Kelsey, J., Khaneft, D., Kiselev, A., Klassen, P., Krivshich, A., Kohl, M., Lehmann, I., Lenisa, P., Lenz, D., Lumsden, S., Ma, Y., Maas, F., O'Connor, C., Marukyan, H., Miklukho, O., Milner, R. G., Movsisyan, A., Murray, M., Naryshkin, Y., Benito, R. Perez, Perrino, R., Redwine, R. P., Piñeiro, D. Rodríguez, Russell, R., Rosner, G., Schneekloth, Uwe, Seitz, B., Statera, M., Thiel, A., Vardanyan, H., Veretennikov, D., Vidal, C., Winnebeck, A., Yeganov, V., Akopov, N., Olympus Collaboration, Alarcon, R., and Ates, O.
- Subjects
Proton ,Physics::Instrumentation and Detectors ,electromagnetic [calorimeter] ,elastic scattering ,General Physics and Astronomy ,Electron ,momentum transfer dependence ,01 natural sciences ,Economica ,electromagnetic form factors ,DESY Lab ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment ,Physics ,Elastic scattering ,Luminosity (scattering theory) ,Form factor (quantum field theory) ,elastic scattering [cross section] ,recoil [p] ,beam [positron] ,target [hydrogen] ,electromagnetic [form factor] ,electron-proton scattering ,Socio-culturale ,FOS: Physical sciences ,electron p: scattering ,Nuclear physics ,Cross section (physics) ,PE2_2 ,PE2_1 ,0103 physical sciences ,form factor [p] ,p: recoil ,ddc:530 ,cross section: elastic scattering ,010306 general physics ,PE2_3 ,hydrogen: target ,Nuclear Physics ,positron p: scattering ,Ambientale ,positron-proton scattering ,DESY ,scattering [electron p] ,form factor: electromagnetic ,scattering [positron p] ,positron: beam ,calorimeter: electromagnetic ,p: form factor ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,spectrometer ,experimental results ,Lepton - Abstract
Physical review letters 126(16), 162501 (1-6) (2021). doi:10.1103/PhysRevLett.126.162501, We report the first measurement of the average of the electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged cross section is insensitive to the leading effects of hard two-photon exchange, giving more robust access to the proton’s electromagnetic form factors. The cross section was extracted from data taken by the OLYMPUS experiment at DESY, in which alternating stored electron and positron beams were scattered from a windowless gaseous hydrogen target. Elastic scattering events were identified from the coincident detection of the scattered lepton and recoil proton in a large-acceptance toroidal spectrometer. The luminosity was determined from the rates of Møller, Bhabha, and elastic scattering in forward electromagnetic calorimeters. The data provide some selectivity between existing form factor global fits and will provide valuable constraints to future fits, Published by APS, College Park, Md.
- Published
- 2021
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