Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Γγ or τ⁺τ⁻ at √s = 13 TeV
A search for dark matter particles is performed by looking for events with large transverse momentum imbalance and a recoiling Higgs boson decaying to either a pair of photons or a pair of τ leptons. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected a...
| Summary: | A search for dark matter particles is performed by looking for events with large transverse momentum imbalance and a recoiling Higgs boson decaying to either a pair of photons or a pair of τ leptons. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected at the CERN LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb⁻¹. No significant excess over the expected standard model background is observed. Upper limits at 95% confidence level are presented for the product of the production cross section and branching fraction in the context of two benchmark simplified models. For the Z′-two-Higgs-doublet model (where Z′is a new massive boson mediator) with an intermediate heavy pseudoscalar particle of mass mA= 300 GeV and mDM= 100 GeV, the Z′masses from 550 GeV to 1265 GeV are excluded. For a baryonic Z′model, with mDM= 1 GeV, Z′masses up to 615 GeV are excluded. Results are also presented for the spin-independent cross section for the dark matter-nucleon interaction as a function of the mass of the dark matter particle. This is the first search for dark matter particles produced in association with a Higgs boson decaying to two τ leptons. Keywords: Dark matter; Hadron-Hadron scattering (experiments) |
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