1. Study of baryon and search for dibaryon resonances by the $pp \rightarrow pp\pi^ + \pi^-$ reaction
- Author
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S. Häggström, T. Johansson, B. Morosov, J. Stepaniak, M. Bashkanov, Hans Calén, Kjell Fransson, W. Brodowski, J. Pätzold, Wolfgang Scobel, Jozef Zlomanczuk, J. Zabierowski, H. Clement, Andrzej Kupsc, Z. Wilhelmi, G. J. Wagner, A. Sukhanov, Arne Johansson, J. Greiff, J. Johanson, K. Kilian, C. Ekström, W. Oelert, Bo Höistad, Roger Ruber, S. Kullander, R. Meier, A. Turowiecki, R. Bilger, E. Doroshkevich, and Pawel Marciniewski
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Branching fraction ,Nuclear Theory ,Hadron ,Baryon ,Nuclear physics ,Deuterium ,Pi ,Nuclear fusion ,Production (computer science) ,Nuclear Experiment ,Charge exchange - Abstract
Exclusive measurements of the two-pion production channel $pp \rightarrow pp\pi^ + \pi^-$ have been carried out near threshold at CELSIUS with the PROMICE/WASA detector. They reveal $pp \rightarrow pp^*(1440)\rightarrow pp\sigma \rightarrow pp(\pi^ + \pi^-)_{I = \ell = 0}$ as the dominant process at these energies, however, the data exhibit also significant contributions from $p^*(1440) \rightarrow \Delta \pi \rightarrow p(\pi^ + \pi^-)_{I = \ell = 0}$ . From the observed interference of these Roper decay routes their relative branching ratio is derived. The status on the search for NN-decoupled $NN\pi$ -resonances is reviewed with regard to recent experimental searches in the pionic double charge exchange in nuclei, the two-pion production in nucleon-nucleon collisions, the photo pion-production on the deuteron and the electro pion-production in nuclei.
- Published
- 2003
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