Speaker
Description
The Higgs trilinear coupling provides a unique opportunity to study the structure of the Higgs sector and probe indirect signs of BSM Physics – even if new states are somehow hidden. In models with extended Higgs sectors, large deviations in the Higgs trilinear coupling can appear at one loop because of non-decoupling effects in the radiative corrections from the additional scalar states. It is then natural to ask how two-loop corrections modify this result, and whether new large corrections can appear again. I will present new results on the dominant two-loop corrections to the Higgs trilinear coupling in several models with extended scalar sectors. I will illustrate the analytical expressions with numerical examples and show that, while they remain smaller than their one-loop counterparts and do not modify significantly the non-decoupling effects observed at one loop, the two-loop corrections are not entirely negligible – a typical size being 10-20% of the one-loop corrections.
| Secondary track (number) | 03. Beyond the Standard Model |
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