We discuss off-shell contributions in Higgs decays to heavy gauge bosons
HβVV(β) with Vβ{Z,W} for a standard model (SM)
Higgs boson for both dominant production processes e+eββZHβZVV(β) and e+eββΞ½Ξ½ΛHβΞ½Ξ½ΛVV(β) at a (linear) e+eβ collider. Dependent on the
centre-of-mass energy off-shell effects are sizable and important for the
understanding of the electroweak symmetry breaking mechanism. Moreover we
shortly investigate the effects of the signal-background interference in
HβΞ³Ξ³ decays for the Higgsstrahlung initiated process
e+eββZΞ³Ξ³, where we report a similar shift in the
invariant mass peak of the two photons as found for the LHC. For both effects
we discuss the sensitivity to the total Higgs width.Comment: 11 pages, 9 figures, talk presented at the International Workshop on
Future Linear Colliders (LCWS14), Belgrade, Serbia, 6-10 October 201