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Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Fundamentale Symmetrien

HK 33.7: Talk

Wednesday, March 21, 2012, 18:30–18:45, P 1

Investigation of the reaction d d 3He n π0 with WASA-at-COSY — •Paweł Podkopał — Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, Germany.

Investigations of charge symmetry breaking in dd collisions is one of the most important topics of the physics programme for the WASA-at-COSY. One of the planned studies focuses on the charge symmetry forbidden reaction d d4He π0. Theoretical calculations based on existing data still lack precise information for determining low-level χPT parameters as well as for the description of dd initial state interaction and 4N final state interaction. New data should comprise the measurement of p-wave pion production in the d d4He π0 and of the charge symmetry conserving d d3He n π0 reaction. The latter measurement is especially necessary in order to study the relevance of initial and final state interaction. The reaction has been measured at a beam momentum of pd = 1.2 GeV/c, using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. The data are described with a phenomenological approach based on the combination of a quasi-free model and partial wave expansion model for the three-body reaction. Data analysis and results will be discussed.

Supported by COSY-FFE (FZ Jülich)

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