Exclusive measurement of the pp -g nn pi(+)pi(+) reaction at 1.1 GeV

T Skorodko,M Bashkanov, D Bogoslawsky,H Calen,H Clement,E Doroshkevich, L Demiroers,Curt Ekstrom,K Fransson,Leif Gustafsson,B Hoistad,G K Ivanov, M Jacewicz,E Jiganov,Tord Johansson,O Khakimova,S Keleta,I Koch, F Kren,S Kullander, A Kupsc, P Marciniewski,R R Meier,B Morosov,C Pauly, H Petren,Y Petukhov,A Povtorejko,Roger Ruber,K Schonning,W Scobel,B Shwartz,J Stepaniak, P Thorngrenengblom,V O Tikhomirov,G J Wagner, M Wolke,Akira Yamamoto,J Zabierowski,J Zlomanczuk

msra（2011）

引用 31|浏览15

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摘要

First exclusive data for the pp -> nnp(+)pi(+) reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of T-p - 1.1 GeV. Total and differential cross-sections disagree with theoretical calculations, which predict the Delta Delta excitation to be the dominant process at this beam energy. Instead, the data require the excitation of one of the nucleons to a higher-lying Delta state, preferably the Delta(1600)P-33, to be the leading process.

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cross section,physical sciences

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