  An interesting question is how present and future experiments will be able to
probe the couplings of the Higgs boson and its intrinsic width at a high level
of precision. There is a wide variety of beyond the Standard Model (BSM)
theories where the Higgs couplings differ from the Standard Model (SM) ones by
less that 10%. We take the SM as the theory of "light" degrees of freedom, i.e.
d=4 operators and simulate the unknown extension of the SM by the most general
set of d=6 operators. In particular we provide an explicit example of
momentum-dependent modification of Higgs couplings.
