July 28, 2020 to August 6, 2020
virtual conference
Europe/Prague timezone

Two-loop corrections to the Higgs trilinear coupling in models with extended scalar sectors

Jul 31, 2020, 12:24 PM
virtual conference

virtual conference

Talk 01. Higgs Physics Higgs Physics


Johannes Braathen (Osaka University)


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

Primary authors

Johannes Braathen (Osaka University) Prof. Shinya KANEMURA (Osaka University)

Presentation materials