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 crossdeltabeendibaryondifferentialexcitationsisotensorreaction

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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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An Isotensor Dibaryon in the pp to ppπ^+π^- Reaction?

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