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@ARTICLE{Henderson:315050,
      author       = {Henderson, Brian and Ice, Lauren and Khaneft, Dmitry and
                      O'Connor, Colton and Russell, Rebecca and Schmidt, Axel and
                      Bernauer, Jan and Kohl, Michael and Akopov, Norair and
                      Alarcon, Ricardo and Ates, Ozgur and Avetisyan, Albert and
                      Beck, Reinhard and Belostotski, Stanislav and Bessuille,
                      Jason and Brinker, Frank and Calarco, John and Carassiti, V.
                      and Cisbani, E. and Ciullo, G. and Contalbrigo, Marco and De
                      Leo, R. and Diefenbach, Juergen and Donnelly, T. W. and Dow,
                      Karen and Elbakian, G. and Eversheim, P. D. and Frullani,
                      Salvatore and Funke, Christian and Gavrilov, Gennady and
                      Gläser, B. and Goerrissen, Nico and Hasell, Douglas and
                      Hauschildt, Jan and Hoffmeister, Philipp and Holler, Yorck
                      and Ihloff, E. and Izotov, Anton and Kaiser, Ralf and
                      Karyan, Gevorg and Kelsey, James and Kiselev, Alexander and
                      Klassen, Peter and Krivshich, A. and Lehmann, Inti and
                      Lenisa, Paolo and Lenz, Dennis and Lumsden, S. and Ma, Yue
                      and Maas, Frank and Marukyan, Hrachya and Miklukho, Oleg and
                      Milner, Richard and Movsisyan, Aram and Murray, Morgan and
                      Naryshkine, Iouri and Perez Benito, R. and Perrino, R. and
                      Redwine, Robert and Rodriguez Pineiro, David and Rosner, G.
                      and Schneekloth, Uwe and Seitz, B. and Statera, M. and
                      Thiel, A. and Vardanyan, Henrik and Veretennikov, Denis and
                      Vidal, C. and Winnebeck, Alexander and Yeganov, Vladislav},
      collaboration = {{OLYMPUS Collaboration}},
      title        = {{H}ard {T}wo-{P}hoton {C}ontribution to {E}lastic
                      {L}epton-{P}roton {S}cattering {D}etermined by the {OLYMPUS}
                      {E}xperiment},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2016-05585, DESY-16-217. arXiv:1611.04685},
      pages        = {4},
      year         = {2016},
      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.},
      cin          = {OLYMP},
      ddc          = {550},
      cid          = {I:(DE-H253)OLYMP-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611)},
      pid          = {G:(DE-HGF)POF3-611},
      experiment   = {EXP:(DE-H253)OLYMPUS-20150101},
      typ          = {PUB:(DE-HGF)25 / PUB:(DE-HGF)29},
      eprint       = {1611.04685},
      howpublished = {arXiv:1611.04685},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1611.04685;\%\%$},
      doi          = {10.3204/PUBDB-2016-05585},
      url          = {https://bib-pubdb1.desy.de/record/315050},
}