Abstract
A search for dark matter produced in association with a Higgs boson decaying to a pair of bottom quarks is performed in proton–proton collisions at a center-of-mass energy of 13,text {Te}text {V} collected with the CMS detector at the LHC. The analyzed data sample corresponds to an integrated luminosity of 35.9,text {fb}^{-1}. The signal is characterized by a large missing transverse momentum recoiling against a bottom quark–antiquark system that has a large Lorentz boost. The number of events observed in the data is consistent with the standard model background prediction. Results are interpreted in terms of limits both on parameters of the type-2 two-Higgs doublet model extended by an additional light pseudoscalar boson mathrm {a} (2HDM+mathrm {a}) and on parameters of a baryonic mathrm {Z}' simplified model. The 2HDM+mathrm {a} model is tested experimentally for the first time. For the baryonic mathrm {Z}' model, the presented results constitute the most stringent constraints to date.
Highlights
The production of the standard model (SM) Higgs boson [5,6,7] via initialstate radiation is highly suppressed because of the mass dependence of its coupling strength to fermions
We present a search for dark matter (DM) production in association with a scalar Higgs boson, h, with a mass of 125 GeV that decays to a bottom quark–antiquark pair
The V+jets (V = W, Z) samples are corrected by weighting the pT of the respective boson with next-to-leading order (NLO) quantum chromodynamics (QCD) corrections obtained from large samples of events generated with MadGraph5_amc@nlo and the FxFx merging technique [27] with up to two additional jets stemming from the matrix element calculations
Summary
The production of the SM Higgs boson [5,6,7] via initialstate radiation is highly suppressed because of the mass dependence of its coupling strength to fermions. We present a search for DM production in association with a scalar Higgs boson, h, with a mass of 125 GeV that decays to a bottom quark–antiquark pair (bb). Two are charge-parity (CP)-even scalars: the light h, assumed to be the observed 125 GeV Higgs boson, and the heavy H These are the result of the mixing of the neutral CP-even weak eigenstates with a mixing angle α. Together with the identification of the hadronization products of the two b quarks produced in the Higgs boson decay, these requirements define a data sample that is expected to be enriched in signal events. Both the signal and background contributions to the hadronic recoil distributions observed in data are extracted with a likelihood fit, performed simultaneously in all samples
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