Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 67: Hadron Structure and Spectroscopy 12
HK 67.7: Talk
Thursday, March 26, 2015, 18:45–19:00, T/SR25
Charge Symmetry Breaking in the dd → 4Heπ0 Reaction with WASA-at-COSY — •Maria Zurek for the WASA-at-COSY collaboration — Forschungzentrum Jülich, Jülich, Germany
Investigations of charge symmetry breaking is one of the key topics for the WASA-at-COSY experiment. The study concentrates on the charge symmetry forbidden dd → 4Heπ0 reaction. The aim is to compare the experimental results with Chiral Perturbation Theory predictions, probing hadronic effects of the up and down quarks mass difference.
It was found that previous data taken close to the reaction threshold were consistent with s-wave. In order to probe also p-wave contributions, new data at sufficiently high energy were required. The measurement should comprise the charge symmetry forbidden dd → 4Heπ0 reaction and the charge symmetry conserving reaction dd → 3Henπ0 to provide additionally the experimental input for the description of the initial state interactions.
Results on the dd → 3Henπ0 and dd → 4Heπ0 reactions with the WASA detector setup at a beam momentum of 1.2 GeV/c will be presented. In addition, the status of the recent high statistics run in spring 2014 will be discussed.