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Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 46: Electromagnetic and Hadronic Probes VI

HK 46.1: Gruppenbericht

Donnerstag, 14. März 2002, 16:00–16:30, D

Exclusive Measurements of the Two-Pion Production in Proton-Proton Collis ions — •J. Kress, J. Pätzold, H. Clement, E. Dorochkevitch, A. Erhardt, G.J. Wagner, and U. Weidlich — Physikalisches Institut der Universität Tübingen

After installation and commissioning of the central calorimeter at COSY-TOF runs at Tp = 750 MeV and 800 MeV have been carried out with polarized beam to study the reaction ppppπ+π over a large solid angle. Deuterons, protons and pions emerging from the pp collision in the LH2 target are identified by the Δ EE method, π+ particles in addition by the recently installed delayed pulse technique. The status of the data analysis of these runs is presented. Data taken previously with the PROMICE/WASA detector at CELSIUS in the energy range Tp = 650-775 MeV have now been fully analyzed. The final results are discussed. Besides of the exclusive data for the ppπ+π channel also integral cross sections for the channels ppπ0π0 and pnπ+π0 have been obtained. The exclusive data show that the ppppπ+π reaction at these energies proceeds via σ exchange and subsequent excitation of the Roper resonance. Its decay into Nππ is observed to be practically exclusively into (ππ)I=l=0 pairs, either directly by NNσ or via N→ Δ π.
  
supported by BMBF (06 TÜ 987) and DFG (European Graduate School)

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