@article{161dcdee7d6746fd9e56cc98d87ecad1,
title = "Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment",
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 M{\o}ller, 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.",
author = "{(OLYMPUS Collaboration)} and Bernauer, {J. C.} and A. Schmidt and Henderson, {B. S.} and Ice, {L. D.} and D. Khaneft and C. O'Connor and R. Russell and N. Akopov and R. Alarcon and O. Ates and A. Avetisyan and R. Beck and S. Belostotski and J. Bessuille and F. Brinker and Calarco, {J. R.} and V. Carassiti and E. Cisbani and G. Ciullo and M. Contalbrigo and {De Leo}, R. and J. Diefenbach and Donnelly, {T. W.} and K. Dow and G. Elbakian and Eversheim, {P. D.} and S. Frullani and Ch Funke and G. Gavrilov and B. Gl{\"a}ser and N. G{\"o}rrissen and Hasell, {D. K.} and J. Hauschildt and Ph Hoffmeister and Y. Holler and E. Ihloff and A. Izotov and R. Kaiser and G. Karyan and J. Kelsey and A. Kiselev and P. Klassen and A. Krivshich and M. Kohl and I. Lehmann and P. Lenisa and D. Lenz and S. Lumsden and Y. Ma and F. Maas",
note = "Funding Information: We thank the DORIS machine group and the various DESY groups that made this experiment possible. We gratefully acknowledge the numerous funding agencies: the Science Committee of Armenia, Grant No. 18T-1C180, the Deutsche Forschungsgemeinschaft, the European Community-Research Infrastructure Activity, the United Kingdom Science and Technology Facilities Council and the Scottish Universities Physics Alliance, the United States Department of Energy and the National Science Foundation, and the Ministry of Education and Science of the Russian Federation. R. G. M. also acknowledges the generous support of the Alexander von Humboldt Foundation, Germany. M. K. is partially supported by Jefferson Lab. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",
year = "2021",
month = apr,
day = "21",
doi = "10.1103/PhysRevLett.126.162501",
language = "English (US)",
volume = "126",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "16",
}