Search for η → e+e− decay with the WASA experiment
National Centre for Nuclear Research, Warsaw, Poland
a e-mail: Marcin.Berlowski@fuw.edu.pl
Nowadays the field of searching for a new physics became a very interesting subject in a light meson decays due to a recent results from KTeV collaboration which found the 3.3σ disagreement between Standard Model theory and their results of π◦ → e+e− branching ratio measurement . They propose to explain this discrepancy with a new U boson particle that interacts both with meson and virtual photon producing e+e −pair . The same effect could be observed in eta meson decay into electron-positron. The current branching ratio limit [3,4] is far away from the predicted non-Standard Model theory and due to that fact it cannot distinguish between Standard Model and more exotic explanation. The following report shows the analysis highlights for searching for a such effect in pp → pp(η → e+e−) at 1.4 GeV produced in WASA@COSY experiment.
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