Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Higgs-Zerfälle in Fermionen II

T 52.3: Talk

Wednesday, March 27, 2019, 16:30–16:45, H04

Search for Higgs boson pair production and constraints on Higgs couplings in the b b τ⁺ τ⁻ final state with 36.1 fb⁻¹ of pp collisions data at √s=13 TeV with the ATLAS detector — •Alessandra Betti, Florian Beisiegel, Christopher Deutsch, Tatjana Lenz, Alexander Melzer, and Norbert Wermes — Physikalisches Institut, Universität Bonn

In the SM Higgs boson pairs can be produced via gluon-gluon fusion through top-quark loops and the Higgs triple self-interaction. The study of this process can therefore allow to probe the structure of the Higgs potential by measuring the Higgs self-coupling λ_HHH. Although the SM cross-section for Higgs pair production is very small, modifications to the top-quark Yukawa coupling or to the Higgs self-coupling, could enhance the di-Higgs production rate and show hints of possible new physics in this process. It is therefore interesting to set constraints on these couplings with the 2015+2016 dataset collected by ATLAS even without yet having the sensitivity to observe the SM process. Moreover, many BSM theories predict heavy resonances that could decay into a pair of Higgs bosons, such as a neutral scalar heavy Higgs in two-Higgs doublet models or spin-2 Kaluza-Klein excitations of the graviton in the bulk Randall-Sundrum model. In the assumption of SM Higgs bosons with m=125 GeV, the b b τ⁺ τ⁻ channel of the di-Higgs decay has the third largest branching fraction (7.4%). The results of the search for Higgs boson pair production in the b b τ⁺ τ⁻ final state obtained with 36.1 fb⁻¹ of pp collisions data at √s=13 TeV with the ATLAS detector will be presented in this talk.