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We explore the use of the Inverse Amplitude Method for unitarization ofscattering amplitudes to derive the existence and properties of possible newheavy states associated with perturbative extensions of the electroweakbreaking sector of the Standard Model starting from the low energy effectivetheory. We use a toy effective theory generated by integrating out a heavysinglet scalar and compare the pole mass and width of the unitarized amplitudeswith those of the original model. Our results show that the Inverse AmplitudeMethod reproduces correctly the singlet mass up to factors of O(1-3), but itswidth is overestimated.

Inverse Amplitude Method for Perturbative Electroweak Symmetry Breaking Sector: The Singlet Higgs Portal as a Study Case