Measurement of the ω → π+π−π0 Dalitz plot distribution : The WASA-at-COSY Collaboration
- Adlarson, Patrik
- Augustyniak, W.
- Bardan, W.
- Bashkanov, M.
- Bergmann, F. S.
- Berlowski, M.
- Bhatt, H.
- Bondar, A.
- Buescher, M.
- Calén, Hans
- Ciepal, I.
- Clement, H.
- Czerwinski, E.
- Demmich, K.
- Engels, R.
- Erven, A.
- Erven, W.
- Eyrich, W.
- Fedorets, P.
- Foehl, K.
- Fransson, Kjell
- Goldenbaum, F.
- Goswami, A.
- Grigoryev, K.
- Gullström, Carl-Oscar
- Heijkenskjöld, Lena
- Hejny, V.
- Huesken, N.
- Jarczyk, L.
- Johansson, Tord
- Kamys, B.
- Kemmerling, G.
- Khan, F. A.
- Khatri, G.
- Khoukaz, A.
- Khreptak, O.
- Kirillov, D. A.
- Kistryn, S.
- Kleines, H.
- Klos, B.
- Krzemien, W.
- Kulessa, P.
- Kupsc, Andrzej
- Kuzmin, A.
- Lalwani, K.
- Lersch, D.
- Lorentz, B.
- Magiera, A.
- Maier, R.
- Marcinievski, Pawel
- Marianski, B.
- Morsch, H. -P
- Moskal, P.
- Ohm, H.
- del Rio, E. Perez
- Piskunov, N. M.
- Prasuhn, D.
- Pszczel, D.
- Pysz, K.
- Pyszniak, Andrzej
- Ritman, J.
- Roy, A.
- Rudy, Z.
- Rundel, O.
- Sawant, S.
- Schadmand, S.
- Schatti-Ozerianska, I.
- Sefzick, T.
- Serdyuk, V.
- Shwartz, B.
- Sitterberg, K.
- Skorodko, T.
- Skurzok, M.
- Smyrski, J.
- Sopov, V.
- Stassen, R.
- Stepaniak, J.
- Stephan, E.
- Sterzenbach, G.
- Stockhorst, H.
- Stroeher, H.
- Szczurek, A.
- Trzcinski, A.
- Varma, R.
- Wolke, Magnus
- Wronska, A.
- Wuestner, P.
- Yamamoto, A.
- Zabierowski, J.
- Zielinski, M. J.
- Zlomanczuk, Jozef
- Zupranski, P.
- Zurek, M.
- Kubis, B.
- Leupold, Stefan
DOIAbstract
Using the production reactions pd -> He-3 omega and pp -> pp omega, the Dalitz plot distribution for the omega -> pi(+)pi(-)pi(0)decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408 +/- 0.042) x 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 phi. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1 sigma. The deviation is parametrised by a linear term 1+2 alpha Z, with alpha determined to be +0.147 +/- 0.036, consistent with the expectations of rho-meson-type final-state interactions of the P-wave pion pairs. (C) 2017 The Aut...
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