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The recent discovery of a Higgs boson at LHC, while establishing the Higgsmechanism as the way of electroweak symmetry breaking, started an era ofprecision measurements involving the Higgs boson. In an effective Lagrangianframework, we consider the e+e- --> ZHH process, at an ILC running at a centreof mass energy of 800 GeV to investigate the effect of the ZZH and ZZHHcouplings on the sensitivity of HHH coupling on this process. Our results showthat the sensitivity of the trilinear Higgs self couplings on this process hassomewhat strong dependence on the Higgs-gauge boson couplings. Single and twoparameter reach of ILC with integrated luminosity of 1000 /fb are obtained onthe effective couplings, c6 and cH, which are related to the HHH couplings,indicating how these limits are affected by the presence of anomalous ZZH andZZHH couplings. The kinematic distributions studied to understand the effect ofthe anomalous couplings, again, show strong influence of Z-H couplings on thedependence of these distributions on HHH coupling. Similar results areindicated in the case of the process, e+e- --> nu nu HH, considered at a centreof mass energy of 2 TeV, where the cross section is large enough. The effect ofWWH and WWHH couplings on the sensitivity of HHH coupling is clearelyestablished through our analyses of this process.

Influence of anomalous VVH and VVHH on determination of Higgs self couplings at ILC