Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Higgs III

T 57.1: Talk

Wednesday, March 21, 2018, 16:30–16:45, Z6 - HS 0.004

Search for Higgs boson pair production in the b b τ⁺ τ⁻ fully hadronic final state at √s=13 TeV with the ATLAS detector — •Alessandra Betti, Florian Beisiegel, Tatjana Lenz, Alexander Melzer, and Norbert Wermes — Physikalisches Institut, Universität Bonn

In the Standard Model (SM) Higgs bosons can be produced in pairs via top quark loops or the Higgs trilinear self-interaction. Although the SM cross-section for Higgs pair production is very small, in several extensions of the SM this cross-section can be enhanced. Non-resonant Higgs pair production can be significantly enhanced by modifications of the triple Higgs self-coupling λ_hhh. Other theories predict heavy resonances that could decay into a pair of Higgs bosons, such as a neutral scalar heavy Higgs in the two Higgs doublet model and spin-2 Kaluza-Klein excitations of the graviton in the bulk Randall-Sundrum model. In the assumption of Higgs bosons with m=125 GeV decaying with branching fractions according to the SM predictions, the b b τ⁺ τ⁻ channel of the di-Higgs decay has the third largest branching fraction (7.4%). The status of the search for resonant and non-resonant Higgs boson pair production in the b b τ⁺ τ⁻ final state with the ATLAS detector will be presented in this talk. Main focus will be on the fully hadronic final state b b τ_had⁺ τ_had⁻.