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.[Figure not available: see fulltext.].

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Search for dark matter produced in association with a Higgs boson decaying to γγ or τ + τ − at √s=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(9) [10.1007/JHEP09(2018)046].

Search for dark matter produced in association with a Higgs boson decaying to γγ or τ + τ − at √s=13 TeV

Dinardo M. E.;Ghezzi A.;Govoni P.;Massironi A.;Paganoni M.;Ragazzi S.;Tabarelli de Fatis T.;Gerosa R.;Lucchini M. T.;De Guio F.;
2018

Abstract

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.[Figure not available: see fulltext.].
Articolo in rivista - Articolo scientifico
Dark matter; Hadron-Hadron scattering (experiments)
English
2018
2018
9
46
none
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Search for dark matter produced in association with a Higgs boson decaying to γγ or τ + τ − at √s=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(9) [10.1007/JHEP09(2018)046].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/286605
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