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We calculate Higgs coupling constants at one-loop level in the Higgs tripletmodel (HTM) to compare to future collider experiments. We evaluate the decayrate of the standard model (SM)-like Higgs boson ($h$) into diphoton.Renormalized Higgs couplings with the weak gauge bosons $hVV$ ($V=W$\ and\ $Z$)and the trilinear coupling $hhh$ are also calculated at the one-loop level inthe on-shell scheme. The event rate of the $pp\rightarrow h \rightarrow\gamma\gamma$ channel in the HTM to the one in the SM can cover the value fromthe recent LHC data. We find that in the allowed parameter region by thecurrent data, deviations in the one-loop corrected $hVV$ and $hhh$ vertices canbe about -1% and +50%, respectively. Magnitudes of these deviations can beenough significant to compare with the precision future data at theInternational Linear Collider.

Radiative corrections to the Higgs boson couplings in the Higgs triplet model