Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment

Bernauer, J. C.; Eversheim, P. D.; Vidal, C.; Khaneft, D.; De Leo, R.; Thiel, A.; Ihloff, E.; Olympus Collaboration; Schneekloth, Uwe; Brinker, F.; Dow, K.; Gläser, B.; Perrino, R.; Hauschildt, J.; Elbakian, G.; Bessuille, J.; Diefenbach, J.; Funke, Ch.; Lehmann, I.; Donnelly, T. W.; Kiselev, A.; Rosner, G.; Vardanyan, H.; Marukyan, H.; Statera, M.; Hasell, D. K.; Cisbani, E.; Schmidt, A.; Murray, M.; Ates, O.; Lenisa, P.; Milner, R. G.; Benito, R. Perez; Izotov, A.; Redwine, R. P.; Henderson, B. S.; Kohl, M.; Akopov, N.; O'Connor, C.; Frullani, S.; Calarco, J. R.; Beck, R.; Carassiti, V.; Naryshkin, Y.; Klassen, P.; Movsisyan, A.; Alarcon, R.; Miklukho, O.; Krivshich, A.; Winnebeck, A.; Belostotski, S.; Kelsey, J.; Contalbrigo, M.; Veretennikov, D.; Lenz, D.; Görrissen, N.; Karyan, G.; Avetisyan, A.; Piñeiro, D. Rodríguez; Ice, L. D.; Maas, F.; Hoffmeister, Ph.; Ma, Y.; Holler, Y.; Lumsden, S.; Kaiser, R.; Ciullo, G.; Gavrilov, G.; Yeganov, V.; Russell, R.; Seitz, B.

doi:10.1103/PhysRevLett.126.162501

Journal Article

PUBDB-2021-02115

Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment

Bernauer, J. C. ; Schmidt, A. ; Henderson, B. S. ; Ice, L. D. ; Khaneft, D. ; O'Connor, C. ; Russell, R. ; Akopov, N. ; Alarcon, R. ; Ates, O. ; Avetisyan, A. ; Beck, R. ; Belostotski, S. ; Bessuille, J. ; Brinker, F.DESY* ; Calarco, J. R. ; Carassiti, V. ; Cisbani, E. ; Ciullo, G. ; Contalbrigo, M. ; De Leo, R. ; Diefenbach, J. ; Donnelly, T. W. ; Dow, K. ; Elbakian, G. ; Eversheim, P. D. ; Frullani, S. ; Funke, C. ; Gavrilov, G. ; Gläser, B. ; Görrissen, N. ; Hasell, D. K. ; Hauschildt, J.DESY* ; Hoffmeister, P. ; Holler, Y.Extern* ; Ihloff, E. ; Izotov, A. ; Kaiser, R. ; Karyan, G. ; Kelsey, J. ; Kiselev, A. ; Klassen, P. ; Krivshich, A. ; Kohl, M. ; Lehmann, I. ; Lenisa, P. ; Lenz, D.DESY* ; Lumsden, S. ; Ma, Y. ; Maas, F. ; Marukyan, H. ; Miklukho, O. ; Milner, R. G. ; Movsisyan, A. ; Murray, M. ; Naryshkin, Y. ; Benito, R. P. ; Perrino, R. ; Redwine, R. P. ; Piñeiro, D. R. ; Rosner, G. ; Schneekloth, U.DESY* ; Seitz, B. ; Statera, M. ; Thiel, A. ; Vardanyan, H. ; Veretennikov, D. ; Vidal, C. ; Winnebeck, A. ; Yeganov, V. ; Olympus Collaboration (Collaboration author)DESY*

2021
APS College Park, Md.

Physical review letters 126(16), 162501 (1-6) (2021) [10.1103/PhysRevLett.126.162501]

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.126.162501 doi:10.3204/PUBDB-2021-02115

Report No.: DESY-20-132; arXiv:2008.05349

Abstract: 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

Keyword(s): experimental results ; cross section: elastic scattering ; form factor: electromagnetic ; calorimeter: electromagnetic ; p: form factor ; hydrogen: target ; positron: beam ; p: recoil ; spectrometer ; electron p: scattering ; positron p: scattering ; elastic scattering ; DESY Lab ; momentum transfer dependence ; Nuclear Physics

Classification:

ddc:530

Note: Received 13 August 2020; revised 17 March 2021; accepted 23 March 2021; published 21 April 2021

Contributing Institute(s):

OLYMPUS Kollaboration (OLYMP)

Research Program(s):

611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

DORIS: OLYMPUS

Appears in the scientific report 2021

Database coverage:
Medline

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