%0 Journal Article
%A Adlarson, P.
%A Adolph, C.
%A Augustyniak, W.
%A Bardan, W.
%A Bashkanov, M.
%A Bednarski, T.
%A Bergmann, F. S.
%A Berłowski, M.
%A Bhatt, H.
%A Brinkmann, K.-T.
%A Büscher, M.
%A Calén, H.
%A Clement, H.
%A Coderre, D.
%A Czerwiński, E.
%A Doroshkevich, E.
%A Engels, R.
%A Erven, W.
%A Eyrich, W.
%A Fedorets, P.
%A Föhl, K.
%A Fransson, K.
%A Goldenbaum, F.
%A Goslawski, P.
%A Grigoryev, K.
%A Gullström, C.-O.
%A Hanhart, C.
%A Heijkenskjöld, L.
%A Heimlich, J.
%A Hejny, V.
%A Hinterberger, F.
%A Hodana, M.
%A Höistad, B.
%A Jacewicz, M.
%A Jany, A.
%A Jany, B. R.
%A Jarczyk, L.
%A Johansson, T.
%A Kamys, B.
%A Kemmerling, G.
%A Khakimova, O.
%A Khoukaz, A.
%A Kistryn, S.
%A Klaja, J.
%A Kleines, H.
%A Kłos, B.
%A Kren, F.
%A Krzemień, W.
%A Kulessa, P.
%A Kupść, A.
%A Lalwani, K.
%A Leupold, S.
%A Lorentz, B.
%A Magiera, A.
%A Maier, R.
%A Mariański, B.
%A Marciniewski, P.
%A Meißner, U.-G.
%A Mikirtychiants, M.
%A Morsch, H.-P.
%A Moskal, P.
%A Nandi, B. K.
%A Niedźwiecki, S.
%A Ohm, H.
%A Passfeld, A.
%A Pauly, C.
%A Perez del Rio, E.
%A Petri, T.
%A Petukhov, Y.
%A Piskunov, N.
%A Pluciński, P.
%A Podkopał, P.
%A Povtoreyko, A.
%A Prasuhn, D.
%A Pricking, A.
%A Pysz, K.
%A Pyszniak, A.
%A Rausmann, T.
%A Redmer, C. F.
%A Ritman, J.
%A Roy, A.
%A Rudy, Z.
%A Sawant, S.
%A Schadmand, S.
%A Schmidt, A.
%A Sefzick, T.
%A Serdyuk, V.
%A Shah, N.
%A Siemaszko, M.
%A Siudak, R.
%A Skorodko, T.
%A Skurzok, M.
%A Smyrski, J.
%A Sopov, V.
%A Stassen, R.
%A Stepaniak, J.
%A Sterzenbach, G.
%A Stockhorst, H.
%A Stollenwerk, F.
%A Ströher, H.
%A Szczurek, A.
%A Täschner, A.
%A Terschlüsen, C.
%A Tolba, T.
%A Trzciński, A.
%A Varma, R.
%A Vlasov, P.
%A Wagner, G. J.
%A Węglorz, W.
%A Winnemöller, A.
%A Wirzba, A.
%A Wolke, M.
%A Wrońska, A.
%A Wüstner, P.
%A Wurm, P.
%A Yuan, X.
%A Yurev, L.
%A Zabierowski, J.
%A Zheng, C.
%A Zieliński, M. J.
%A Zipper, W.
%A Złomańczuk, J.
%A Żuprański, P.
%T Exclusive measurement of the η→ $\pi^+ \pi^-$ γ decay
%J Physics letters / B
%V 707
%N 2
%C Amsterdam
%I North-Holland Publ.
%M FZJ-2012-00573
%P 243 - 249
%D 2012
%X 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.
%K eta: radiative decay (INSPIRE)
%K pi: angular distribution (INSPIRE)
%K photon: energy spectrum (INSPIRE)
%K form factor: vector (INSPIRE)
%K invariance: gauge (INSPIRE)
%K beam: momentum (INSPIRE)
%K p deuteron: fusion (INSPIRE)
%K Juelich COSY PS (INSPIRE)
%K mass spectrum: (pi+ pi- photon) (INSPIRE)
%K eta: hadroproduction (INSPIRE)
%K experimental results (INSPIRE)
%K eta --> pi+ pi- photon (INSPIRE)
%K p deuteron --> helium eta (INSPIRE)
%K 1.7 GeV/c (INSPIRE)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000300134400002
%R 10.1016/j.physletb.2011.12.027
%U https://juser.fz-juelich.de/record/127615