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arXiv · 1803.03193

An Isotensor Dibaryon in the $pp \to pp\pi^+\pi^-$ Reaction?

P. Adlarson·W. Augustyniak·W. Bardan·M. Bashkanov·F. S. Bergmann·M. Berłowski·A. Bondar·M. Büscher·H. Calén·I. Ciepał·H. Clement·E. Czerwiński·K. Demmich·R. Engels·A. Erven·W. Erven·W. Eyrich·P. Fedorets·K. Föhl·K. Fransson·F. Goldenbaum·A. Goswami·K. Grigoryev·L. Heijkenskjöld·V. Hejny·N. Hüsken·L. Jarczyk·T. Johansson·B. Kamys·G. Kemmerling·A. Khoukaz·O. Khreptak·D. A. Kirillov·S. Kistryn·H. Kleines·B. Kłos·W. Krzemień·P. Kulessa·A. Kupść·K. Lalwani·D. Lersch·B. Lorentz·A. Magiera·P. Marciniewski·B. Mariański·H. --P. Morsch·P. Moskal·H. Ohm·W. Parol·E. Perez del Rio·N. M. Piskunov·D. Prasuhn·D. Pszczel·K. Pysz·J. Ritman·A. Roy·Z. Rudy·O. Rundel·S. Sawant·S. Schadmand·I. Schätti--Ozerianska·T. Sefzick·V. Serdyuk·B. Shwartz·T. Skorodko·M. Skurzok·J. Smyrski·V. Sopov·R. Stassen·J. Stepaniak·E. Stephan·G. Sterzenbach·H. Stockhorst·H. Ströher·A. Szczurek·A. Trzciński·M. Wolke·A. Wrońska·P. Wüstner·A. Yamamoto·J. Zabierowski·M. J. Zieliński·P. Żuprański·M. Żurek
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Abstract

Exclusive measurements of the quasi-free $pp \to pp\pi^+\pi^-$ reaction have been carried out at WASA@COSY by means of $pd$ collisions at $T_p$ = 1.2 GeV. Total and differential cross sections have been extracted covering the energy region $T_p = 1.08 - 1.36$ GeV, which is the region of $N^*(1440)$ and $\Delta(1232)\Delta(1232)$ resonance excitations. Calculations describing these excitations by $t$-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. An isotensor $\Delta N$ dibaryon resonance with $I(J^P) = 2(1^+)$ produced associatedly with a pion is able to overcome these deficiencies.

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P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berłowski, A. Bondar, M. Büscher, H. Calén, I. Ciepał, H. Clement, E. Czerwiński, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Föhl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, L. Heijkenskjöld, V. Hejny, N. Hüsken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, A. Khoukaz, O. Khreptak, D. A. Kirillov, S. Kistryn, H. Kleines, B. Kłos, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, P. Marciniewski, B. Mariański, H. --P. Morsch, P. Moskal, H. Ohm, W. Parol, E. Perez del Rio, N. M. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schätti--Ozerianska, T. Sefzick, V. Serdyuk, B. Shwartz, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Ströher, A. Szczurek, A. Trzciński, M. Wolke, A. Wrońska, P. Wüstner, A. Yamamoto, J. Zabierowski, M. J. Zieliński, P. Żuprański, M. Żurek. 2018-03-08. An Isotensor Dibaryon in the $pp \to pp\pi^+\pi^-$ Reaction?. https://doi.org/10.1103/physrevlett.121.052001

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