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We calculate renormalized Higgs boson couplings with gauge bosons andfermions at the one-loop level in the model with an additional isospin singletreal scalar field. These coupling constants can deviate from the predictions inthe standard model due to tree-level mixing effects and one-loop contributionsof the extra neutral scalar boson. We investigate how they can be significantunder the theoretical constraints from perturbative unitarity and vacuumstability and also the condition of avoiding the wrong vacuum. Furthermore,comparing with the predictions in the Type I two Higgs doublet model, wenumerically demonstrate how the singlet extension model can be distinguishedand identified by using precision measurements of the Higgs boson couplings atfuture collider experiments.

Radiative corrections to the Higgs boson couplings in the model with an additional real singlet scalar field