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Exclusive Measurement of the η → π + π − γ Decay The WASA-at-COSY Collaboration
| Content Provider | Semantic Scholar |
|---|---|
| Author | Adlarson, Patrik Adolph, Ch Augustyniak, Włodzimierz Bardan, W. Bashkanov, Mikhail Bednarski, Tomasz Bergmann, F. S. Berłowski, M. Bhatt, Himani Brinkmann, K-Th. Büscher, M. Calén, Hans Clement, Heinz Coderre, D. Czerwiński, Eryk Doroshkevich, Evgeni Engels, Ryland Erven, W. Eyrich, W. Fedorets, P. V. Foehl, K. Fransson, Kj. Goldenbaum, Frank Goslawski, P. Grigoryev, K. Gullström, C. – O. Hanhart, Christoph Heijkenskjöld, Lena Heimlich, J. Hejny, Volker Hinterberger, Frank Hodana, M. Hoeistad, B. Jacewicz, Marek Jany, A. Jany, Benedykt R. Jarczyk, Lucjan Johansson, Tord Kamys, B. Kemmerling, Günter Khakimova, O. A. Khoukaz, Alfons Kistryn, S. Klaja, Joanna Kleines, H. Kłos, B. Kren, F. Krzemien, Wojciech Kulessa, Peter Kupsc, Andrzej Lalwani, Kiran Leupold, Stefan Lorentz, Benoît Magiera, A. Maier, Rodrigo Mariański, Bohdan Marciniewski, Pawel Meißner, U. – G. Mikirtychiants, M. Morsch, H. Peter Moskal, Paweł Nandi, Basanta Kumar Niedźwiecki, Sławomir Passfeld, Annika Pauly, Ch. Río, Elena Pérez Del Petri, T. Petukhov, Yu. P. Piskunov, N. Plucínski, P. Podkopał, Paweł Povtoreyko, A. A. Prasuhn, D. Pricking, Annette Pysz, Krzysztof Pyszniak, Andrzej Rausmann, T. Redmer, Christoph Florian Ritman, James Roy, Arabindo Rudy, Zbigniew Sawant, S. Schadmand, Susan Schmidt, Anja Sefzick, T. Serdyuk, Vladislav Shah, Neha Siemaszko, Magdalena Siudak, Regina Skorodko, T. Yu. Skurzok, Magdalena Smyrski, Jerzy Sopov, Viktor Stassen, Rolf Stepaniak, Joanna Sterzenbach, G. Stockhorst, Hans Stollenwerk, Felix Szczurek, Antoni Taeschner, Annagret Terschlüsen, Carla Tolba, T. Trzci'nski, A. Varma, Raghava Vlasov, P. А. Wagner, Gerhard J. Wȩglorz, W. Winnemoeller, A. Wirzba, Andreas Wolke, Magnus Wrońska, Aleksandra Wuestner, P. Wurm, P. Yuan, X. Yurev, L. Zabierowski, J. Zheng, Chen Zieliński, Marcin Zipper, Wiktor Złománczuk, J. Zupranski, Pawel |
| Copyright Year | 2016 |
| Abstract | An exclusive measurement of the decay η → ππγ has been performed at the WASA facility at COSY. The η mesons were produced in the fusion reaction pd→He X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13960±140 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 η→ ππγ. 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 ππ system. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://juser.fz-juelich.de/record/127615/files/1107.5277v2.pdf?subformat=pdfa |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
