Abstract
First exclusive data for the \(\ensuremath{pp \to nn\pi^+\pi^+}\) reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of Tp = 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 \(\ensuremath{\Delta(1600)P_{33}}\) , to be the leading process.
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Communicated by J. Bijnens
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License ( https://creativecommons.org/licenses/by-nc/2.0 ), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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The CELSIUS/WASA Collaboration., Skorodko, T., Bashkanov, M. et al. Exclusive measurement of the pp → nnπ+π+ reaction at 1.1 GeV. Eur. Phys. J. A 47, 108 (2011). https://doi.org/10.1140/epja/i2011-11108-2
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DOI: https://doi.org/10.1140/epja/i2011-11108-2