New Physics Effect on the Higgs Self-Coupling

Abstract

One-loop corrections to the self-coupling constant of the lightest CP-even Higgs boson are studied in the two Higgs doublet model. After renormalization is performed, quartic contributions of heavy particle's mass can appear in the effective coupling. We find that these non-decoupling effects can yield $\mathcal{O}(100)$ % deviations from the Standard Model prediction, even when all the other couplings of the lightest Higgs boson to gauge bosons and fermions are in good agreement with the Standard Model.

added comments and references, corrected typos, to appear in Physics Letters B, revtex4, 13 pages including 3 figures

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