Isotensor Dibaryon in the pp→ppπ^{+}π^{-} 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,R Maier, 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,J Złomańczuk, P Żuprański,M Żurek

PHYSICAL REVIEW LETTERS（2018）

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摘要

Exclusive measurements of the quasifree pp -> 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(123)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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