/ nucl-ex arXiv:1610.02187

Measurement of the $\omega \to \pi^+ \pi^- \pi^0$ Dalitz plot distribution

Adlarson, P. (Uppsala U.) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Bardan, W. (Jagiellonian U.) ; Bashkanov, M. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bergmann, F.S. (Munster U.) ; Berłowski, M. (Warsaw, Inst. Nucl. Studies) ; Bhatt, H. (Indian Inst. Tech., Mumbai) ; Bondar, A. (Novosibirsk State U.) ; Büscher, M. (Julich, Forschungszentrum) ; Calén, H. (Uppsala U.) ; Ciepał, I. (Cracow, INP) ; Clement, H. (Tubingen U.) ; Czerwiński, E. (Jagiellonian U.) ; Demmich, K. (Munster U.) ; Engels, R. (Julich, Forschungszentrum) ; Erven, A. (Julich, Forschungszentrum) ; Erven, W. (Julich, Forschungszentrum) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Fedorets, P. (Moscow, ITEP) ; Föhl, K. (Giessen U., Inst. Kernphys.) ; Fransson, K. (Uppsala U.) ; Goldenbaum, F. (Julich, Forschungszentrum) ; Goswami, A. (Indian Inst. Tech., Kanpur) ; Grigoryev, K. (PNPI, CSTD) ; Gullström, C.-O. (Uppsala U.) ; se, L.Heijkenskjöld}\ead{lena.heijkenskjold@physics.uu. (Uppsala U.) ; Hejny, V. (Julich, Forschungszentrum) ; Hüsken, N. (Munster U.) ; Jarczyk, L. (Jagiellonian U.) ; Johansson, T. (Uppsala U.) ; Kamys, B. (Jagiellonian U.) ; Kemmerling, G. (Julich, Forschungszentrum) ; Khan, F.A. (Julich, Forschungszentrum) ; Khatri, G. (Jagiellonian U.) ; Khoukaz, A. (Munster U.) ; Khreptak, O. (Jagiellonian U.) ; Kirillov, D.A. (Dubna, JINR) ; Kistryn, S. (Jagiellonian U.) ; Kleines, H. (Julich, Forschungszentrum) ; Kłos, B. (Silesia U.) ; Krzemień, W. (Jagiellonian U.) ; Kulessa, P. (Cracow, INP) ; Kupść, A. (Warsaw, Inst. Nucl. Studies) ; Kuzmin, A. (Novosibirsk State U.) ; Lalwani, K. (Ambedkar, Nat. Inst. Technol.) ; Lersch, D. (Julich, Forschungszentrum) ; Lorentz, B. (Julich, Forschungszentrum) ; Magiera, A. (Jagiellonian U.) ; Maier, R. (JCHP, Julich) ; Marciniewski, P. (Uppsala U.) ; Mariański, B. (Warsaw, Inst. Nucl. Studies) ; Morsch, H.-P. (Warsaw, Inst. Nucl. Studies) ; Moskal, P. (Jagiellonian U.) ; Ohm, H. (Julich, Forschungszentrum) ; Perez del Rio, E. (Tubingen U.) ; Piskunov, N.M. (Dubna, JINR) ; Prasuhn, D. (Julich, Forschungszentrum) ; Pszczel, D. (Warsaw, Inst. Nucl. Studies) ; Pysz, K. (Cracow, INP) ; Pyszniak, A. (Jagiellonian U.) ; Ritman, J. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Roy, A. (Indian Inst. Tech., Kanpur) ; Rudy, Z. (Jagiellonian U.) ; Rundel, O. (Jagiellonian U.) ; in, S.Sawant}\ead{siddhesh.sawant@iitb.ac. (Julich, Forschungszentrum) ; Schadmand, S. (Julich, Forschungszentrum) ; Schätti-Ozerianska, I. (Jagiellonian U.) ; Sefzick, T. (Julich, Forschungszentrum) ; Serdyuk, V. (Julich, Forschungszentrum) ; Shwartz, B. (Novosibirsk State U.) ; Sitterberg, K. (Munster U.) ; Skorodko, T. (Tomsk State U.) ; Skurzok, M. (Jagiellonian U.) ; Smyrski, J. (Jagiellonian U.) ; Sopov, V. (Moscow, ITEP) ; Stassen, R. (Julich, Forschungszentrum) ; Stepaniak, J. (Warsaw, Inst. Nucl. Studies) ; Stephan, E. (Silesia U.) ; Sterzenbach, G. (Julich, Forschungszentrum) ; Stockhorst, H. (Julich, Forschungszentrum) ; Ströher, H. (JCHP, Julich) ; Szczurek, A. (Cracow, INP) ; Trzciński, A. (Warsaw, Inst. Nucl. Studies) ; Varma, R. (Indian Inst. Tech., Mumbai) ; Wolke, M. (Uppsala U.) ; Wrońska, A. (Jagiellonian U.) ; Wüstner, P. (Julich, Forschungszentrum) ; Yamamoto, A. (KEK, Tsukuba) ; Zabierowski, J. (Jagiellonian U.) ; Zieliński, M.J. (Jagiellonian U.) ; Złomańczuk, J. (Uppsala U.) ; Zuprański, P. (Warsaw, Inst. Nucl. Studies) ; Zurek, M. (Julich, Forschungszentrum) ; Leupold, S. (Uppsala U.)

Pages: 8

Abstract: Using the production reactions $pd\to {}^3\mbox{He}\,\omega$ and $pp\to pp\omega$, the Dalitz plot distribution for the $\omega \to \pi^+ \pi^- \pi^0$ decay is studied with the WASA detector at COSY, based on a combined data sample of $ (4.408\pm 0.042) \times 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 $+0.147\pm0.036$, consistent with the expectations of $\rho$-meson-type final-state interactions of the $P$-wave pion pairs.

Web-Page: http://inspirehep.net/record/1490691/files/DPExpFunc.png; http://inspirehep.net/record/1490691/files/DPZP_binnr.png; http://inspirehep.net/record/1490691/files/MM3He_E145.png; http://inspirehep.net/record/1490691/files/MM3He_E150.png; http://inspirehep.net/record/1490691/files/MMpp.png; http://inspirehep.net/record/1490691/files/FDpidPD.png; http://inspirehep.net/record/1490691/files/AlphaExpTheo.png; http://inspirehep.net/record/1490691/files/DPefficiency_noXcor.png; http://inspirehep.net/record/1490691/files/DPSectResid.png; http://inspirehep.net/record/1490691/files/FDpidPP.png; http://inspirehep.net/record/1490691/files/arXiv:1610.02187.pdf

Note: *Brief entry*; *Temporary entry*; 8 pages, 7 figures

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