Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 61: Fundamental Symmetries

HK 61.6: Talk

Wednesday, March 18, 2009, 18:00–18:15, H-ZO 70

The Charge Symmetry Breaking in dd → α π^∘ reaction with WASA-at-COSY — •Tytus Smolinski — Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, Jülich

The dd → α π^∘ reaction violates isospin and - in particular also charge-symmetry (CS).On the quark level, these symmetries are broken due to the quark mass differences and electromagnetic interaction. Therefore, an experimental determination of the value of the total cross section for the dd → α π^∘ process, which constitutes a direct measure of the charge symmetry breaking (CSB), provides an opportunity for studies of the quark masses.

Based on existing data close to threshold a consistent description of CSB effects in the framework of Chiral Pertubation Theory is currently being developed. As a first result this analysis will provide a prediction of the p-wave contribution at higher energies. In order to verify this prediction a dedicated experimental program is underway using the WASA-at-COSY facility. In June/July 2008 a first experimental run was successfully completed. In the talk a status of the on-going data analysis will be presented.