/ nucl-ex arXiv:1306.5130


Measurement of the $pn \to pp\pi^0\pi^-$ Reaction in Search for the Recently Observed Resonance Structure in $d\pi^0\pi^0$ and $d\pi^+\pi^-$ systems


Adlarson, P. (Uppsala U.) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Bardan, W. (Jagiellonian U.) ; Bashkanov, M. (Tubingen U.) ; Bergmann, F.S. (Munster U.) ; Berlowski, M. (Warsaw, Inst. Nucl. Studies) ; Bhatt, H. (Indian Inst. Tech., Mumbai) ; Buscher, M. (Julich, Forschungszentrum) ; Calen, H. (Uppsala U.) ; Ciepal, I. (Jagiellonian U.) ; Clement, H. (Tubingen U.) ; Coderre, D. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Czerwinski, E. (Jagiellonian U.) ; Demmich, K. (Munster U.) ; Doroshkevich, E. (Tubingen U.) ; Engels, R. (Julich, Forschungszentrum) ; Erven, W. (Julich, Forschungszentrum) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Fedorets, P. (Moscow, ITEP) ; Fohl, K. (Giessen U.) ; Fransson, K. (Uppsala U.) ; Goldenbaum, F. (Julich, Forschungszentrum) ; Goslawski, P. (Munster U.) ; Goswami, A. (Indian Inst. Tech., Indore) ; Grigoryev, K. (St. Petersburg, INP) ; Gullstrom, C.O. (Uppsala U.) ; Hauenstein, F. (Erlangen - Nuremberg U.) ; Heijkenskjold, L. (Uppsala U.) ; Hejny, V. (Julich, Forschungszentrum) ; Hinterberger, F. (Bonn U. Observ.) ; Hodana, M. (Julich, Forschungszentrum) ; Hoistad, B. (Uppsala U.) ; Jany, A. (Jagiellonian U.) ; Jany, B.R. (Jagiellonian U.) ; Jarczyk, L. (Jagiellonian U.) ; Johansson, T. (Uppsala U.) ; Kamys, B. (Jagiellonian U.) ; Kemmerling, G. (Julich, Forschungszentrum) ; Khan, F.A. (Julich, Forschungszentrum) ; Khoukaz, A. (Munster U.) ; Kirillov, D.A. (Dubna, JINR) ; Kistryn, S. (Jagiellonian U.) ; Klaja, J. (Jagiellonian U.) ; Kleines, H. (Julich, Forschungszentrum) ; Klos, B. (Silesia U.) ; Krapp, M. (Erlangen - Nuremberg U.) ; Krzemien, W. (Jagiellonian U.) ; Kulessa, P. (Cracow, INP) ; Kupsc, A. (Warsaw, Inst. Nucl. Studies) ; Lalwani, K. (Indian Inst. Tech., Mumbai) ; Lersch, D. (Julich, Forschungszentrum) ; Li, L. (Erlangen - Nuremberg U.) ; Lorentz, B. (Julich, Forschungszentrum) ; Magiera, A. (Jagiellonian U.) ; Maier, R. (Julich, Forschungszentrum) ; Marciniewski, P. (Uppsala U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Mikirtychiants, M. (St. Petersburg, INP) ; Morsch, H.P. (Warsaw, Inst. Nucl. Studies) ; Moskal, P. (Jagiellonian U.) ; Nandi, B.K. (Indian Inst. Tech., Mumbai) ; Ohm, H. (Julich, Forschungszentrum) ; Ozerianska, I. (Jagiellonian U.) ; Perez del Rio, E. (Tubingen U.) ; Piskunov, N.M. (Dubna, JINR) ; Plucinski, P. (Uppsala U.) ; Podkopal, P. (Julich, Forschungszentrum) ; Prasuhn, D. (Julich, Forschungszentrum) ; Pricking, A. (Tubingen U.) ; Pszczel, D. (Warsaw, Inst. Nucl. Studies) ; Pysz, K. (Cracow, INP) ; Pyszniak, A. (Jagiellonian U.) ; Redmer, C.F. (Uppsala U.) ; Ritman, J. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Roy, A. (Indian Inst. Tech., Indore) ; Rudy, Z. (Jagiellonian U.) ; Sawant, S. (Indian Inst. Tech., Mumbai) ; Schmidt, A. (Erlangen - Nuremberg U.) ; Schadmand, S. (Julich, Forschungszentrum) ; Sefzick, T. (Julich, Forschungszentrum) ; Serdyuk, V. (Dubna, JINR) ; Shah, N. (Indian Inst. Tech., Mumbai) ; Siemaszko, M. (Silesia U.) ; Siudak, R. (Cracow, INP) ; Skorodko, T. (Tubingen 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) ; Stroher, H. (Julich, Forschungszentrum) ; Szczurek, A. (Cracow, INP) ; Tolba, T. (Julich, Forschungszentrum) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Varma, R. (Indian Inst. Tech., Mumbai) ; Wagner, G.J. (Tubingen U.) ; Weglorz, W. (Silesia U.) ; Wolke, M. (Uppsala U.) ; Wronska, A. (Jagiellonian U.) ; Wustner, P. (Julich, Forschungszentrum) ; Wurm, P. (Julich, Forschungszentrum) ; Yamamoto, A. (KEK, Tsukuba) ; Yuan, X. (Lanzhou, Inst. Modern Phys.) ; Zabierowski, J. (Lodz, IPJ) ; Zheng, C. (Lanzhou, Inst. Modern Phys.) ; Zielinski, M.J. (Jagiellonian U.) ; Zipper, W. (Silesia U.) ; Zlomanczuk, J. (Uppsala U.) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies) ; Zurek, M. (Jagiellonian U.)

Abstract: Exclusive measurements of the quasi-free $pn \to pp\pi^0\pi^-$ reaction have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $\sqrt s$ = (2.35 - 2.46) GeV, which includes the region of the ABC effect and its associated resonance structure. No ABC effect, {\it i.e.} low-mass enhancement is found in the $\pi^0\pi^-$-invariant mass spectrum -- in agreement with the constraint from Bose statistics that the isovector pion pair can not be in relative s-wave. At the upper end of the covered energy region $t$-channel processes for Roper, $\Delta(1600)$ and $\Delta\Delta$ excitations provide a reasonable description of the data, but at low energies the measured cross sections are much larger than predicted by such processes. Adding a resonance amplitude for the resonance at $m$=~2.37 GeV with $\Gamma$ =~70 MeV and $I(J^P)=~0(3^+)$ observed recently in $pn \to d\pi^0\pi^0$ and $pn \to d\pi^+\pi^-$ reactions leads to an agreement with the data also at low energies.

Web-Page: http://inspirehep.net/record/1239514/files/cosp_2355.png; http://inspirehep.net/record/1239514/files/cosp_2370.png; http://inspirehep.net/record/1239514/files/cosp_2405.png; http://inspirehep.net/record/1239514/files/cosp_2445.png; http://inspirehep.net/record/1239514/files/cospi0_2355.png; http://inspirehep.net/record/1239514/files/cospi0_2370.png; http://inspirehep.net/record/1239514/files/cospi0_2405.png; http://inspirehep.net/record/1239514/files/cospi0_2445.png; http://inspirehep.net/record/1239514/files/cospim_2355.png; http://inspirehep.net/record/1239514/files/cospim_2370.png; http://inspirehep.net/record/1239514/files/cospim_2405.png; http://inspirehep.net/record/1239514/files/cospim_2445.png; http://inspirehep.net/record/1239514/files/invpimpi0_2355.png; http://inspirehep.net/record/1239514/files/invpimpi0_2370.png; http://inspirehep.net/record/1239514/files/invpimpi0_2405.png; http://inspirehep.net/record/1239514/files/invpimpi0_2445.png; http://inspirehep.net/record/1239514/files/invpp_2355.png; http://inspirehep.net/record/1239514/files/invpp_2370.png; http://inspirehep.net/record/1239514/files/invpp_2405.png; http://inspirehep.net/record/1239514/files/invpp_2445.png; http://inspirehep.net/record/1239514/files/invppim_2355.png; http://inspirehep.net/record/1239514/files/invppim_2370.png; http://inspirehep.net/record/1239514/files/invppim_2405.png; http://inspirehep.net/record/1239514/files/invppim_2445.png; http://inspirehep.net/record/1239514/files/invpppi0_2355.png; http://inspirehep.net/record/1239514/files/invpppi0_2370.png; http://inspirehep.net/record/1239514/files/invpppi0_2405.png; http://inspirehep.net/record/1239514/files/invpppi0_2445.png; http://inspirehep.net/record/1239514/files/pspect.png; http://inspirehep.net/record/1239514/files/tot_pi0pim.png; http://inspirehep.net/record/1239514/files/arXiv%3A1306.5130.pdf


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