  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 3.3\sigma\ disagreement between Standard Model theory and their
results of \pi 0-->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 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 (\eta --> e+e-) at 1.4 GeV produced in WASA@COSY experiment.
