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@ARTICLE{Kser:859247,
      author       = {Käser, A. and Dieterle, M. and Witthauer, L. and Abt, S.
                      and Achenbach, P. and Adlarson, P. and Afzal, F. and Ahmed,
                      Z. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and
                      Bashkanov, M. and Beck, R. and Biroth, M. and Borisov, N. S.
                      and Braghieri, A. and Briscoe, W. J. and Cividini, F. and
                      Collicott, C. and Costanza, S. and Denig, A. and Downie, E.
                      J. and Drexler, P. and Fix, A. and Garni, S. and Glazier, D.
                      I. and Gorodnov, I. and Gradl, W. and Günther, M. and
                      Gurevich, G. M. and Heijkenskjöld, L. and Hornidge, D. and
                      Huber, G. M. and Kashevarov, V. L. and Kay, S. and
                      Keshelashvili, I. and Kondratiev, R. and Korolija, M. and
                      Krusche, B. and Lazarev, A. B. and Lisin, V. and Livingston,
                      K. and Lutterer, S. and MacGregor, I. J. D. and Manley, D.
                      M. and Martel, P. P. and Metag, V. and Meyer, W. and
                      Miskimen, R. and Mornacchi, E. and Mushkarenkov, A. and
                      Neganov, A. B. and Neiser, A. and Oberle, M. and Ostrick, M.
                      and Otte, P. B. and Paudyal, D. and Pedroni, P. and
                      Polonski, A. and Prakhov, S. N. and Reicherz, G. and Ron, G.
                      and Rostomyan, T. and Sarty, A. and Sfienti, C. and
                      Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky,
                      I. I. and Strub, Th. and Supek, I. and Thiel, A. and Thiel,
                      M. and Thomas, A. and Unverzagt, M. and Usov, Yu. A. and
                      Wagner, S. and Walford, N. K. and Watts, D. P. and
                      Werthmüller, D. and Wettig, J. and Wolfes, M. and Zana, L.},
      title        = {{F}irst measurement of helicity-dependent cross sections in
                      π0η photoproduction from quasi-free nucleons},
      journal      = {Physics letters / B B},
      volume       = {786},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {FZJ-2019-00121},
      pages        = {305 - 312},
      year         = {2018},
      abstract     = {The helicity-dependent cross sections for the
                      photoproduction of pairs have been measured for the first
                      time. The experiment was performed at the tagged photon
                      facility of the Mainz MAMI accelerator with the combined
                      Crystal Ball – TAPS calorimeter. The experiment used a
                      polarized deuterated butanol target and a circularly
                      polarized photon beam. This arrangement allowed the (photon
                      and target spin antiparallel) and (parallel spins)
                      components to be measured for quasi-free production of pairs
                      off protons and neutrons. The main finding is that the two
                      helicity components contribute identically, within
                      uncertainties, for both participant protons and neutrons.
                      The absolute couplings for protons and neutrons are also
                      identical. This means that nucleon resonances contributing
                      to this reaction in the investigated energy range have
                      almost equal electromagnetic helicity couplings, and .
                      Identical couplings for protons and neutrons are typical for
                      Δ resonances and identical and components are only possible
                      for states, which constrains possible contributions of
                      nucleon resonances.},
      cin          = {IKP-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-2-20111104},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF3-612)},
      pid          = {G:(DE-HGF)POF3-612},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000452318400040},
      doi          = {10.1016/j.physletb.2018.10.006},
      url          = {https://juser.fz-juelich.de/record/859247},
}