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T: Fachverband Teilchenphysik

T 34: QCD theory II

T 34.3: Vortrag

Dienstag, 31. März 2020, 17:30–17:45, H-ÜR 1

Vector boson fusion searches for dark matter: Probing the Higgs funnel — •Jan Heisig¹, Michael Krämer², Eric Magde³, and Alexander Mück² — ¹Centre for Cosmology, Particle Physics and Phenomenology - CP3 Université catholique de Louvain — ²Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University — ³PRISMA+ Cluster of Excellence and Mainz Institute for Theoretical Physics

We constrain the Higgs-portal model employing the vector-boson fusion channel at the LHC. In particular, we include the phenomenologically interesting parameter region of the Higgs funnel in which the Higgs-boson mass is close to the threshold for dark- matter production and a running-width prescription has to be employed for the Higgs-boson propagator. Limits for the Higgs portal coupling as a function of the dark-matter mass are derived from the CMS search for invisible Higgs-boson decays in vector-boson fusion at 13 TeV. Furthermore, we perform projections for the 14 TeV HL-LHC and the 27 TeV HE- LHC taking into account a realistic estimate of the systematic uncertainties. The respective upper limits on the invisible branching ratio of the Higgs reach down to 2 % and constrain perturbative Higgs-portal couplings up to DM masses of 110 GeV.