/ nucl-ex arXiv:1702.07212

Isoscalar Single-Pion Production in the Region of Roper and $d^*(2380)$ Resonances

Adlarson, P. (Uppsala U.) ; Augustyniak, W. (NCBJ, Swierk) ; Bardan, W. (Jagiellonian U.) ; Bashkanov, M. (Edinburgh U.) ; Bergmann, F.S. (Munster U.) ; Berłowski, M. (NCBJ, Swierk) ; 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. (U. Giessen, II. Phys. Inst.) ; Fransson, K. (Uppsala U.) ; Goldenbaum, F. (Julich, Forschungszentrum) ; Goswami, A. (Indian Inst. Tech., Kanpur) ; Grigoryev, K. (St. Petersburg, INP) ; Gullström, C.-O. (Uppsala U.) ; Heijkenskjöld, L. (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) ; 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. (NCBJ, Swierk) ; 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. (NCBJ, Swierk) ; Morsch, H.-P. (NCBJ, Swierk) ; Moskal, P. (Jagiellonian U.) ; Ohm, H. (Julich, Forschungszentrum) ; Parol, W. (Cracow, INP) ; Perez del Rio, E. (Tubingen U.) ; Piskunov, N.M. (Dubna, JINR) ; Prasuhn, D. (Julich, Forschungszentrum) ; Pszczel, D. (NCBJ, Swierk) ; 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.) ; Sawant, S. (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. (NCBJ, Swierk) ; Stephan, E. (Silesia U.) ; Sterzenbach, G. (Julich, Forschungszentrum) ; Stockhorst, H. (Julich, Forschungszentrum) ; Ströher, H. (JCHP, Julich) ; Szczurek, A. (Cracow, INP) ; Trzciński, A. (NCBJ, Swierk) ; Varma, R. (Indian Inst. Tech., Mumbai) ; Wolke, M. (Uppsala U.) ; Wrońska, A. (Jagiellonian U.) ; Wüstner, P. (Julich, Forschungszentrum) ; Yamamoto, A. (KEK, Tsukuba) ; Zabierowski, J. (Lodz U.) ; Zieliński, M.J. (Jagiellonian U.) ; Złomańczuk, J. (Uppsala U.) ; Żuprański, P. (NCBJ, Swierk) ; Żurek, M. (Julich, Forschungszentrum)

Abstract: Exclusive measurements of the quasi-free $pn \to pp\pi^-$ and $pp \to pp\pi^0$ reactions 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 $T_p = 0.95 - 1.3$ GeV ($\sqrt s$ = 2.3 - 2.46 GeV), which includes the regions of $\Delta(1232)$, $N^*(1440)$ and $d^*(2380)$ resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below $T_p$ = 1 GeV. We observe a substantial increase of this cross section above 1 GeV, which can be related to the Roper resonance $N^*(1440)$, the strength of which shows up isolated from the $\Delta$ resonance in the isoscalar $(N\pi)_{I=0}$ invariant-mass spectrum. No evidence for a decay of the dibaryon resonance $d^*(2380)$ into the isoscalar $(NN\pi)_{I=0}$ channel is found. An upper limit of 180 $\mu$b (90 $\%$ C.L.) corresponding to a branching ratio of 9 $\%$ has been deduced.

Web-Page: http://inspirehep.net/record/1514892/files/sig0_sqrts.png; http://inspirehep.net/record/1514892/files/cosp_pppi0.png; http://inspirehep.net/record/1514892/files/cosp_pppim.png; http://inspirehep.net/record/1514892/files/sig0_all_Tp.png; http://inspirehep.net/record/1514892/files/pi0-pim-comp.png; http://inspirehep.net/record/1514892/files/invpp_pppi0.png; http://inspirehep.net/record/1514892/files/cospi_pppim.png; http://inspirehep.net/record/1514892/files/invppi_pppim.png; http://inspirehep.net/record/1514892/files/invppi_pppi0.png; http://inspirehep.net/record/1514892/files/invpp_pppim.png; http://inspirehep.net/record/1514892/files/pppim_cr.png; http://inspirehep.net/record/1514892/files/pppi0_cr2.png; http://inspirehep.net/record/1514892/files/cospi_pppi0.png; http://inspirehep.net/record/1514892/files/arXiv:1702.07212.pdf

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