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Measurement of the ω → π+ π− π0 Dalitz plot distribution
Adlarson, P. ; Augustyniak, W. ; Bardan, W. ; Bashkanov, M. ; Bergmann, F. S. ; Berłowski, M. ; Bhatt, H.FZJ* ; Bondar, A. ; Büscher, M.FZJ* ; Calén, H. ; Ciepał, I. ; Clement, H. ; Czerwiński, E. ; Demmich, K. ; Engels, R. W.FZJ* ; Erven, A.FZJ* ; Erven, W. ; Eyrich, W. ; Fedorets, P.FZJ* ; Föhl, K. ; Fransson, K. ; Goldenbaum, F.FZJ* ; Goswami, A. ; Grigoryev, K.FZJ* ; Gullström, C.-O. ; Heijkenskjöld, L. (Corresponding author) ; Hejny, V.FZJ* ; Hüsken, N. ; Jarczyk, L. ; Johansson, T. ; Kamys, B. ; Kemmerling, G.FZJ* ; Khan, F. A. ; Khatri, G. ; Khoukaz, A. ; Khreptak, O. ; Kirillov, D. A. ; Kistryn, S. ; Kleines, H.FZJ* ; Kłos, B. ; Krzemień, W. ; Kulessa, P.FZJ* ; Kupść, A. ; Kuzmin, A. ; Lalwani, K. ; Lersch, D.FZJ* ; Lorentz, B.FZJ* ; Magiera, A. ; Maier, R.FZJ* ; Marciniewski, P. ; Mariański, B. ; Morsch, H.-P. ; Moskal, P.FZJ* ; Ohm, H. ; Perez del Rio, E. ; Piskunov, N. M. ; Prasuhn, D.FZJ* ; Pszczel, D. ; Pysz, K. ; Pyszniak, A. ; Ritman, J.FZJ* ; Roy, A. ; Rudy, Z. ; Rundel, O. ; Sawant, S. ; Schadmand, S.FZJ* ; Schätti-Ozerianska, I. ; Sefzick, T.FZJ* ; Serdyuk, V.FZJ* ; Shwartz, B. ; Sitterberg, K. ; Skorodko, T. ; Skurzok, M. ; Smyrski, J. ; Sopov, V. ; Stassen, R.FZJ* ; Stepaniak, J. ; Stephan, E. ; Sterzenbach, G.FZJ* ; Stockhorst, H.FZJ* ; Stroeher, H.FZJ* ; Szczurek, A. ; Trzciński, A. ; Varma, R. ; Wolke, M. ; Wrońska, A. ; Wüstner, P.FZJ* ; Yamamoto, A. ; Zabierowski, J. ; Zieliński, M. J. ; Złomańczuk, J. ; Żuprański, P. ; Żurek, M.FZJ* ; Kubis, B. ; Leupold, S.
2017
North-Holland Publ.
Amsterdam
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Please use a persistent id in citations: http://hdl.handle.net/2128/14876 doi:10.1016/j.physletb.2017.03.050
Abstract: Using the production reactions pd→3Heω and pp→ppω, the Dalitz plot distribution for the ω→π+π−π0 decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408±0.042)×10^4 events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and ϕ. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1σ . The deviation is parametrised by a linear term 1+2αZ, with α determined to be +0.147±0.036, consistent with the expectations of ρ-meson-type final-state interactions of the P-wave pion pairs.
Contributing Institute(s):
- Experimentelle Hadronstruktur (IKP-1)
- Experimentelle Hadrondynamik (IKP-2)
- Zentralinstitut für Elektronik (ZEA-2)
- Kernphysikalische Großgeräte (IKP-4)
- IKP- Technische und Administrative Infrastruktur (IKP-TA)
Research Program(s):
- 612 - Cosmic Matter in the Laboratory (POF3-612) (POF3-612)
Experiment(s):
- WASA (Wide Angle Shower Apparatus) at COSY
Appears in the scientific report
2017
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