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T: Fachverband Teilchenphysik

T 55: Bosonic and Rare Higgs decays

T 55.4: Talk

Wednesday, March 17, 2021, 16:45–17:00, Te

New limit on the Higgs-to-invisible branching fraction based on a combination of ATLAS searches at √s = 7, 8 and 13 TeV — •Philipp Mogg — Ludwigs-Maximilians-Universität München

In the Standard Model the Higgs-to-invisible branching fraction is very small, hence, current experiments are not expected so be sensitive to it. However, many extensions of the Standard Model suggest a significantly higher branching ratio, as e.g. Higgs-portal models, where the Higgs boson acts as a mediator between dark matter and ordinary matter. This contribution presents a novel combination by the ATLAS collaboration of different searches sensitive to invisible Higgs decays. Together with the LHC Run 1 search results, the present combination obtains the currently best direct limit on the Higgs-to-invisible branching fraction. The talk will highlight the analyses entering the combination, as well as the interpretations made, as in particular in Higgs-portal dark matter models.