We study the effects of dimension-six operators on the Higgs decay into
four lepton channel. The calculation of new matrix elements has been
performed in the so-called Higgs basis and it is
implemented in a Monte Carlo event generator.
A mapping between the parameters of the phenomenological Lagrangian
and those of the Warsaw and SILH bases is also implemented.
We consider all the relevant operators, both the CP-even and CP-odd
operators, which contribute to this decay channel. Choosing suitable benchmark
values for some relevant Wilson coefficients, we compare our predictions
for partial decay width and some important kinematic distributions with
the NLO (EW) SM predictions. A paper, collecting our results, has been recently published (arXiv:1703.06667) and will be submitted to an international peer-reviewed journal in the forthcoming days.