7-12 June 2018
Auditorium Maximum
Europe/Warsaw timezone
15th International Workshop on Meson Production, Properties and Interaction
Contribution parallel talk
Auditorium Maximum
-
Conference room
Dielectron pairs from $\eta$ meson decays at WASA detector
Speakers
- Damian PSZCZEL
Primary authors
- Damian PSZCZEL (National Centre for Nuclear Research)
Co-authors
- Prof. Joanna STEPANIAK (National Centre for Nuclear Research, Warsaw @ Swierk, poland)
Files
Collaboration
WASA-at-COSY
Abstract content
We present the analysis of $\eta\to e^+e^-\gamma$, $\eta\to e^+e^-$ and $\eta\to \pi^0 e^+e^-$ decays. Our data set was collected in proton-proton collisions at 1.4 GeV using the WASA-at-COSY experimental setup. We discuss the extraction procedure of the $\eta$ meson transition form factor and show an attempt to search for physics beyond the Standard Model setting an upper limit on the coupling between photons and hypothetical dark boson. Estimates of branching ratio upper limits for very rare $\eta\to e^+e^-$ and $\eta\to \pi^0e^+e^-$ decays are also presented.