On the Production of an Isotensor Dibaryon in the pp to ppπ^+π^- Reaction

P. Adlarson , W. Augustyniak , W. Bardan , M. Bashkanov , F.S. Bergmann , M. Ber{\l}owski , A. Bondar , M. B\"uscher

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H. Cal\'en I. Ciepa{\l} H. Clement E. Czerwi\'nski K. Demmich R. Engels A. Erven W. Erven W. Eyrich P. Fedorets K. F\"ohl K. Fransson F. Goldenbaum A. Goswami K. Grigoryev L. Heijkenskj\"old V. Hejny N. H\"usken L. Jarczyk T. Johansson B. Kamys G. Kemmerling A. Khoukaz O. Khreptak D.A. Kirillov S. Kistryn H. Kleines B. K{\l}os W. Krzemie\'n P. Kulessa A. Kup\'s\'c K. Lalwani D. Lersch B. Lorentz A. Magiera P. Marciniewski B. Maria\'nski 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. Sch\"atti--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. Str\"oher A. Szczurek A. Trzci\'nski M. Wolke A. Wro\'nska P. W\"ustner A. Yamamoto J. Zabierowski M.J. Zieli\'nski P. \.Zupra\'nski M. \.Zurek

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classification ⚛️ nucl-ex hep-ex

keywords crossdeltadibaryonbeendifferentialexcitationsisotensorreaction

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Exclusive measurements of the quasi-free $pp \to pp\pi^+\pi^-$ 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 $T_p = 1.08 - 1.36$ GeV ($\sqrt s$ = 2.35 - 2.46 GeV), which includes the regions of $N^*(1440)$ and $\Delta(1232)\Delta(1232)$ resonance excitations. Calculations describing these excitations by $t$-channel meson exchange are at variance with experimental differential cross sections and underpredict substantially the measured 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. Such a dibaryon was predicted by Dyson and Xuong and more recently calculated by Gal and Garcilazo.

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On the Production of an Isotensor Dibaryon in the pp to ppπ^+π^- Reaction

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