Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Hadronenstruktur und -spektroskopie VI

HK 24.6: Talk

Tuesday, March 22, 2011, 18:00–18:15, C-2

Investigations of Double Pion Production in Proton-Proton Collisions at T_p = 1400 MeV — •Tamer Tolba and James Ritman — Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, Germany

Pion production, especially double pion production, in proton-proton collisions is an important source of information on the nucleon-nucleon (NN) interactions and on nucleon resonance properties.
The mechanisms for double pion production in proton-proton collisions are strongly momentum dependent and are expected to be dominated by baryon resonance intermediate states. This channel was studied at energies close to threshold up to T_p = 1300 MeV at the CELSIUS/WASA experiment.
The reaction pp→ppπ⁰π⁰ was investigated with the WASA-at-COSY facility and values for both the total and differential cross sections have been obtained for a beam energy of 1400 MeV. The results are compared to theoretical expectations. Clear evidence for the ΔΔ excitation is observed, without a significant signature for a contribution of the Roper N^*(1440).
Supported in part by BMBF, FZ-Jülich and the Wallenberg Foundation.