1. Two-Pion Production in Proton-Proton Collisions.
- Author
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Bashkanov, M., Abdel-Samad, S., Brinkmann, K. -Th., Calén, H., Cappellaro, F., Clemen, H., Demiroers, L., Doroshkevich, E., Dshemuchadse, S., Ekström, C., Erhardt, A., Eyrich, W., Fransson, K., Freiesleben, H., Fritsch, M., Gillitzer, A., Gustafsson, L., Höistad, B., Jacewicz, M., and Johansson, T.
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PARTICLES (Nuclear physics) , *PIONS , *FERMIONS , *HADRONS , *BARYONS , *MESONS - Abstract
A program to measure the two-pion production in nucleon-nucleon collisions exclusively and in all channels from threshold up to Tp = 1360 MeV has been started at CELSIUS-WASA. First preliminary results for ppπ+π¯ and ppπ0π0 channels are presented. In the near-threshold region they are consistent with a dominance of the Roper excitation and its successive decay into Nσ and Δπ channels. At energies Tp > 1 GeV we observe a very different behavior, which is at variance with theoretical predictions. At COSY-TOF exclusive measurements of the pp → ppπ+π¯ reaction have been carried out with polarized beam. Preliminary results show non-zero analyzing powers which point to a sizeable admixture of l ≠ 0 partial waves indicating possibly an influence of the ρ-channel. [ABSTRACT FROM AUTHOR]
- Published
- 2004
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