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@INPROCEEDINGS{Kohl:301926,
      author       = {Kohl, Michael},
      title        = {{EM} {F}orm {F}actors and {OLYMPUS}},
      journal      = {The European physical journal / Web of Conferences},
      volume       = {81},
      issn         = {2100-014X},
      address      = {Les Ulis},
      publisher    = {EDP Sciences},
      reportid     = {PUBDB-2016-02983},
      pages        = {01006 -},
      year         = {2014},
      abstract     = {The elastic form factors of the nucleon characterize the
                      distributions of charge and magnetization in momentum space
                      and are important input for calculations of strong
                      interaction phenomena and nuclear structure. The dramatic
                      discrepancy in the observed ratio of elastic proton form
                      factors between the Rosenbluth separation and polarization
                      transfer methods has invoked numerous theoretical and
                      experimental investigations. The previously neglected effect
                      from two-photon exchange has become the favored explanation
                      for the discrepancy. While the effect can not be calculated
                      from first principles, it can be verified experimentally in
                      several ways, most stringently by comparing the
                      positron-proton and electron-proton elastic cross sections.
                      The OLYMPUS experiment at DESY has been carried out to
                      quantify the effect of two-photon exchange using intense
                      stored positron and electron beams along with an internal
                      unpolarized hydrogen target and alarge acceptance detector
                      to measure the ratio of the positron-proton and
                      electron-proton elastic scattering cross sections. The
                      status of proton form factor measurements and of the
                      experimental efforts to verify the effect of two-photon
                      exchange is presented, withsome emphasis on the OLYMPUS
                      experiment.},
      month         = {May},
      date          = {2014-05-29},
      organization  = {13th International Workshop on Meson
                       Production, Properties and Interaction,
                       KRAKÓW (Poland), 29 May 2014 - 3 Jun
                       2014},
      cin          = {OLYMP},
      ddc          = {530},
      cid          = {I:(DE-H253)OLYMP-20120731},
      pnm          = {Experiments at DORIS (OLYMPUS) (POF2-515)},
      pid          = {G:(DE-H253)POF2-DORIS-Exp.-(OLYMPUS)-20130405},
      experiment   = {EXP:(DE-H253)OLYMPUS-20150101},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
      UT           = {WOS:000351440900006},
      doi          = {10.1051/epjconf/20148101006},
      url          = {https://bib-pubdb1.desy.de/record/301926},
}