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Preprint/Report PUBDB-2016-05585
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Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment

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2016
APS College Park, Md.

College Park, Md. : APS 4 pp. () [10.3204/PUBDB-2016-05585]
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Report No.: DESY-16-217; arXiv:1611.04685

Abstract: The OLYMPUS collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, $\it R_{2 \gamma}$, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS measurement, 2.01 GeV electron and positron beams were directed through a hydrogen gas target internal to the DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight scintillators detected elastically scattered leptons in coincidence with recoiling protons over a scattering angle range of $\approx$ 20° to 80°. The relative luminosity between the two beam species was monitored using tracking telescopes of interleaved GEM and MWPC detectors at 12°, as well as symmetric Møller/Bhabha calorimeters at 1:29°. A total integrated luminosity of $4.5 fb^{-1}$ was collected. In the extraction of $\it R_{2\gamma}$, radiative effects were taken into account using a Monte Carlo generator to simulate the convolutions of internal bremsstrahlung with experiment-specific conditions such as detector acceptance and reconstruction efficiency. The resulting values of $\it R_{2\gamma}$, presented here for a wide range of virtual photon polarization 0:456 < $\epsilon$< 0:978, are smaller than hadronic two-photon exchange calculations predict, but are consistent with phenomenological models.

Classification:
Contributing Institute(s):
  1. OLYMPUS Kollaboration (OLYMP)
Research Program(s):
  1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)
Experiment(s):
  1. DORIS: OLYMPUS

Appears in the scientific report 2016
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Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment
Physical review letters 118(9), 092501 () [10.1103/PhysRevLett.118.092501]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

 Record created 2016-11-24, last modified 2021-11-10
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OpenAccess:
2016_paper Physical review letters - Download fulltext PDF Download fulltext PDF (PDFA)
1611.04685v1(1) - Download fulltext PDF Download fulltext PDF (PDFA)
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