Abstract
The WASA detector at COSY have measured the ω meson in the reaction channel p + d → 3He + ω. With this data we aim to study two hadronic decays of the ω meson, ω → π+ π− π0 and ω → π+ π−. The goal for the π+π−π0 study is to extract a Dalitz plot of the final state pions. An high statistics Dalitz plot would enable tests of theoretical predictions for the decay mechanism. The goal for the π+π− study is to perform an independent verification of the branching ratio.
Highlights
The WASA detector at COSY have measured the ω meson in the reaction channel p + d → 3He + ω. With this data we aim to study two hadronic decays of the ω meson, ω → π+ π− π0 and ω → π+ π−
The goal for the π+π− study is to perform an independent verification of the branching ratio
Previous experimental measurements are of limited statistics and are not useful in more detailed studies
Summary
The first measurement of the Dalitz plot for the ω → π+π−π0 decay channel was used to determine the spin and parity of the ω particle by observing the P-wave state of the pions, [1]. Previous experimental measurements are of limited statistics and are not useful in more detailed studies This raises our interest to produce a high statistics Dalitz plot. When the vector mesons are produced in e+e− collisions, their amplitudes add mainly coherently resulting in a strong interference. Experiments using this production method is the main contribution to the measured ω → π+π− branching ratio, [4]. In hadronic production, such as the WASA-at-COSY experiment, the amplitudes add mainly incoherent and a clearer separation of the ω and ρ final states is possible
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