Exclusive Measurement of the $pp \to nnπ^+π^+$ Reaction at 1.1 GeV

Details Exclusive Measurement of the $pp \to nnπ^+π^+$ Reaction at 1.1 GeV Exclusive Measurement of the $pp \to nnπ^+π^+$ Reaction at 1.1 GeV

2010-12-07

arxiv.org/abs/1012.1463v1

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

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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