Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 34: QCD theory II
T 34.3: Talk
Tuesday, March 31, 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.