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@ARTICLE{Adlarson:127615,
      author       = {Adlarson, P. and Adolph, C. and Augustyniak, W. and Bardan,
                      W. and Bashkanov, M. and Bednarski, T. and Bergmann, F. S.
                      and Berłowski, M. and Bhatt, H. and Brinkmann, K.-T. and
                      Büscher, M. and Calén, H. and Clement, H. and Coderre, D.
                      and Czerwiński, E. and Doroshkevich, E. and Engels, R. and
                      Erven, W. and Eyrich, W. and Fedorets, P. and Föhl, K. and
                      Fransson, K. and Goldenbaum, F. and Goslawski, P. and
                      Grigoryev, K. and Gullström, C.-O. and Hanhart, C. and
                      Heijkenskjöld, L. and Heimlich, J. and Hejny, V. and
                      Hinterberger, F. and Hodana, M. and Höistad, B. and
                      Jacewicz, M. and Jany, A. and Jany, B. R. and Jarczyk, L.
                      and Johansson, T. and Kamys, B. and Kemmerling, G. and
                      Khakimova, O. and Khoukaz, A. and Kistryn, S. and Klaja, J.
                      and Kleines, H. and Kłos, B. and Kren, F. and Krzemień, W.
                      and Kulessa, P. and Kupść, A. and Lalwani, K. and Leupold,
                      S. and Lorentz, B. and Magiera, A. and Maier, R. and
                      Mariański, B. and Marciniewski, P. and Meißner, U.-G. and
                      Mikirtychiants, M. and Morsch, H.-P. and Moskal, P. and
                      Nandi, B. K. and Niedźwiecki, S. and Ohm, H. and Passfeld,
                      A. and Pauly, C. and Perez del Rio, E. and Petri, T. and
                      Petukhov, Y. and Piskunov, N. and Pluciński, P. and
                      Podkopał, P. and Povtoreyko, A. and Prasuhn, D. and
                      Pricking, A. and Pysz, K. and Pyszniak, A. and Rausmann, T.
                      and Redmer, C. F. and Ritman, J. and Roy, A. and Rudy, Z.
                      and Sawant, S. and Schadmand, S. and Schmidt, A. and
                      Sefzick, T. and Serdyuk, V. and Shah, N. and Siemaszko, M.
                      and Siudak, R. and Skorodko, T. and Skurzok, M. and Smyrski,
                      J. and Sopov, V. and Stassen, R. and Stepaniak, J. and
                      Sterzenbach, G. and Stockhorst, H. and Stollenwerk, F. and
                      Ströher, H. and Szczurek, A. and Täschner, A. and
                      Terschlüsen, C. and Tolba, T. and Trzciński, A. and Varma,
                      R. and Vlasov, P. and Wagner, G. J. and Węglorz, W. and
                      Winnemöller, A. and Wirzba, A. and Wolke, M. and Wrońska,
                      A. and Wüstner, P. and Wurm, P. and Yuan, X. and Yurev, L.
                      and Zabierowski, J. and Zheng, C. and Zieliński, M. J. and
                      Zipper, W. and Złomańczuk, J. and Żuprański, P.},
      title        = {{E}xclusive measurement of the η→ $\pi^+ \pi^-$ γ
                      decay},
      journal      = {Physics letters / B},
      volume       = {707},
      number       = {2},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {FZJ-2012-00573},
      pages        = {243 - 249},
      year         = {2012},
      abstract     = {An exclusive measurement of the decay eta --> pi+ pi- gamma
                      has been performed at the WASA facility at COSY. The eta
                      mesons were produced in the fusion reaction pd --> 3He X at
                      a proton beam momentum of 1.7 GeV/c. Efficiency corrected
                      differential distributions have been extracted based on
                      $13340\pm140$ events after background subtraction. The
                      measured pion angular distribution is consistent with a
                      relative p-wave of the two-pion system, whereas the measured
                      photon energy spectrum was found at variance with the
                      simplest gauge invariant matrix element of eta --> pi+ pi-
                      gamma. A parameterization of the data can be achieved by the
                      additional inclusion of the empirical pion vector form
                      factor multiplied by a first-order polynomial in the squared
                      invariant mass of the pi+ pi- system.},
      keywords     = {eta: radiative decay (INSPIRE) / pi: angular distribution
                      (INSPIRE) / photon: energy spectrum (INSPIRE) / form factor:
                      vector (INSPIRE) / invariance: gauge (INSPIRE) / beam:
                      momentum (INSPIRE) / p deuteron: fusion (INSPIRE) / Juelich
                      COSY PS (INSPIRE) / mass spectrum: (pi+ pi- photon)
                      (INSPIRE) / eta: hadroproduction (INSPIRE) / experimental
                      results (INSPIRE) / eta --> pi+ pi- photon (INSPIRE) / p
                      deuteron --> helium eta (INSPIRE) / 1.7 GeV/c (INSPIRE)},
      cin          = {IAS-4 / IKP-3 / IKP-TH / IKP-2 / IKP-TA / IKP-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104 /
                      I:(DE-Juel1)VDB223 / I:(DE-Juel1)IKP-2-20111104 /
                      I:(DE-Juel1)IKP-TA-20111104 / I:(DE-Juel1)IKP-1-20111104},
      pnm          = {531 - Hadron Structure and Dynamics (HSD) (POF2-531)},
      pid          = {G:(DE-HGF)POF2-531},
      experiment   = {EXP:(DE-Juel1)WASA-at-COSY-20170712},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000300134400002},
      eprint       = {1107.5277},
      howpublished = {arXiv:1107.5277},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1107.5277;\%\%$},
      doi          = {10.1016/j.physletb.2011.12.027},
      url          = {https://juser.fz-juelich.de/record/127615},
}