Abstract
An inclusive search for the standard model Higgs boson (H) produced with large transverse momentum (p_{T}) and decaying to a bottom quark-antiquark pair (bb[over ¯]) is performed using a data set of pp collisions at sqrt[s]=13 TeV collected with the CMS experiment at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb^{-1}. A highly Lorentz-boosted Higgs boson decaying to bb[over ¯] is reconstructed as a single, large radius jet, and it is identified using jet substructure and dedicated b tagging techniques. The method is validated with Z→bb[over ¯] decays. The Z→bb[over ¯] process is observed for the first time in the single-jet topology with a local significance of 5.1 standard deviations (5.8 expected). For a Higgs boson mass of 125GeV, an excess of events above the expected background is observed (expected) with a local significance of 1.5 (0.7) standard deviations. The measured cross section times branching fraction for production via gluon fusion of H→bb[over ¯] with reconstructed p_{T}>450 GeV and in the pseudorapidity range -2.5<η<2.5 is 74±48(stat)_{-10}^{+17}(syst) fb, which is consistent within uncertainties with the standard model prediction.
Highlights
LHC data aseHtsiogfgsppbocsoolnlis(iHon)swaat spdffisffiis1⁄4co7vearnedd [9,10,11], the 8 TeV were not sufficient to establish the coupling to bottom quarks [12], despite the 58.1% expected branching fraction of the Higgs boson to bottom quark-antiquark pairs [13]
The results reporptedffiffi in this Letter are based on a data set of pp collisions at s 1⁄4 13 TeV, collected with the CMS detector at the LHC in 2016, and corresponding to an integrated luminosity of 35.9 fb−1
The dominant background from standard model (SM) quantum chromodynamics (QCD) multijet production is estimated in data by inverting the b tagging requirement, which is, by design, decorrelated from jet mass and pT
Summary
N12;DDT is applied, where DDT stands for designed decorrelated tagger [57], to reduce its correlation with ρ and pT in multijet events. The contribution of tt production to the total SM background is estimated to be less than 3% It is obtained from simulation corrected with scale factors derived from a tt-enriched control sample in which an isolated muon is required. This sample is included in a global fit used to extract the signal and the scale factors are treated as unconstrained parameters They multiply the tt contribution, correcting its overall normalization and the double-b mistag efficiency for jets originating from top quark decays. The systematic uncertainties associated with the jet mass scale, the jet mass resolution, and the N12;DDT selection efficiency are correlated among the W, Z, and Hðbb Þ processes. These uncertainties are estimated using an independent sample of merged W jets.
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