Exclusive Measurement of the $pp \to nn\pi^+\pi^+$ Reaction at 1.1 GeV

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

arXiv · 1012.1463

Exclusive Measurement of the $pp \to nn\pi^+\pi^+$ Reaction at 1.1 GeV

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Abstract

First exclusive data for the $pp \to nn\pi^+\pi^+$ 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 a higher-lying $\Delta$ state, most likely the $\Delta(1600)$, to be the leading process.

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M. Bashkanov, D. Bogoslawsky, H. Calen, H. Clement, E. Doroshkevich, L. Demiroers, C. Ekstrom, K. Fransson, L. Gustafsson, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, S. Keleta, I. Koch, F. Kren, S. Kullander, A. Kupsc, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Petren, Y. Petukhov, A. Povtorejko, R. J. M. Y. Ruber, K. Schonning, W. Scobel, B. Shwartz, J. Stepaniak, P. Thorngren-Engblom, V. Tikhomirov, G. J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, J. Zlomanczuk. 2010-12-07. Exclusive Measurement of the $pp \to nn\pi^+\pi^+$ Reaction at 1.1 GeV. https://arxiv.org/abs/1012.1463

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