NDLI: Exclusive Measurement of the η → π + π − γ Decay The WASA-at-COSY Collaboration

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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, M. Bednarski, Tadeusz Bergmann, F. S. Berłowski, Marcin Bhatt, Himani Brinkmann, K. – T. Büscher, M. Calén, Hans Clement, Heinz Coderre, D. Czerwiński, Eryk Doroshkevich, Evgeni Engels, Ryland Erven, W. Eyrich, Wolfgang K. Fedorets, P. Foehl, K. Fransson, Kj. Goldenbaum, Frank Goslawski, P. Grigoryev, K. Gullström, C. – O. Hanhart, Ch. 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. Klos, Brad Kren, F. Krzemien, Wojciech Kulessa, P. Kupść, Andrzej Lalwani, Kavita Leupold, Stefan Lorentz, Benoît Magiera, A. Maier, Rodrigo Mariański, Bohdan Marciniewski, Pawel Meißner, U. – G. Mikirtychiants, M. Morsch, H. – P. Moskal, Paweł Nandi, Basanta Kumar Niedźwiecki, Sławomir Passfeld, Annika Pauly, Cameron Río, Elena Pérez Del Petri, T. Petukhov, Yuri Piskunov, N. M. Plucinski, Pawel Podkopał, Paweł Povtoreyko, A. A. Prasuhn, Dieter Pricking, Annette Pysz, Krzysztof Pyszniak, Andrzej Rausmann, T. Redmer, Christoph Florian Ritman, James Roy, Ankhi Rudy, Zbigniew Sawant, S. Schadmand, Susan Schmidt, Anja Sefzick, Th. Serdyuk, V. Y. Shah, Nilay Siemaszko, Magdalena Siudak, Regina Skorodko, T. Skurzok, Magdalena Smyrski, Jerzy Sopov, V. 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 Zlomanczuk, Jozef Zupra'nski, P.
Copyright Year	2011
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 →3He X at a proton beam momentum of 1.7 GeV /c. Efficiency corrected di fferential distributions have been extracted based on 13960 ±140 events after background subtraction. The measured pion angular distribution is consistent with a relativep-wave of the two-pion system, whereas the measured photon en ergy 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 additi onal nclusion 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
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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