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

The CELSIUS/WASA collaboration Skorodko, T. ; Bashkanov, M. ; Bogoslawsky, D. ; et al.
Eur.Phys.J.A 47 (2011) 108, 2011.
Inspire Record 879711 DOI 10.17182/hepdata.63827

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.

9 data tables
Table 1

Total cross section.

Table 2

Distribution of the invariant mass of the PI+PI+ system.

Table 3

Distribution of the cosine of the PI+_PI+ opening angle DELTA at an incident kinetic energy of 1.1 GeV.

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