Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment
نویسندگان
چکیده
We report the first measurement of average electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged section is insensitive to leading effects hard two-photon exchange, giving more robust access proton’s electromagnetic form factors. The was extracted from data taken by OLYMPUS experiment at DESY, in which alternating stored electron positron beams were scattered a windowless gaseous hydrogen target. Elastic events identified coincident detection recoil proton large-acceptance toroidal spectrometer. luminosity determined rates Møller, Bhabha, forward calorimeters. provide some selectivity between existing factor global fits will valuable constraints future fits.Received 13 August 2020Revised 17 March 2021Accepted 23 2021DOI:https://doi.org/10.1103/PhysRevLett.126.162501© 2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectron & scatteringPropertiesForm factorsNuclear Physics
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2021
ISSN: ['1079-7114', '0031-9007', '1092-0145']
DOI: https://doi.org/10.1103/physrevlett.126.162501