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Résumé |
The Higgs trilinear coupling provides a unique opportunity to probe the structure of the Higgs sector, study the nature of the electroweak phase transition, and search for New Physics. It is known that in BSM models it can deviate significantly from its SM prediction at one loop, because of non-decoupling effects in the radiative corrections from extra scalars. One may then wonder how this result is modified at two loops, and whether new large effects may appear. In this talk, I will present recent results on the calculation of leading two-loop corrections to the Higgs trilinear coupling in a range of theories with extended scalar sectors – massive models such as the Two-Higgs-Doublet Model as well as theories with classical scale invariance. I will show that, while the two-loop corrections do not modify significantly the non-decoupling effects observed at one loop, their computation is important in view of the experimental program to precisely measure the Higgs trilinear coupling at current and future colliders. |
