Abstract
A search for Higgs bosons that decay into a bottom quark-antiquark pair and are accompanied by at least one additional bottom quark is performed with the CMS detector. The data analyzed were recorded in proton-proton collisions at a centre-of-mass energy of sqrt{s}=13 TeV at the LHC, corresponding to an integrated luminosity of 35.7 fb−1. The final state considered in this analysis is particularly sensitive to signatures of a Higgs sector beyond the standard model, as predicted in the generic class of two Higgs doublet models (2HDMs). No signal above the standard model background expectation is observed. Stringent upper limits on the cross section times branching fraction are set for Higgs bosons with masses up to 1300 GeV. The results are interpreted within several MSSM and 2HDM scenarios.
Highlights
Background modelThe main background for this analysis originates from multijet production, with at least two energetic jets containing b hadrons, and a third jet that satisfies the b tagging selection but possibly as a result of a mistag
The relevant features of the multijet background are studied in a suitable control region (CR) in data, which is obtained from the triple b tag selection by imposing a b-tag veto on the third leading jet
Systematic uncertainties are treated as nuisance parameters and profiled in the statistical interpretation using lognormal priors for uncertainties affecting the signal yield, while Gaussian priors are used for shape uncertainties
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. The inner tracker is formed by a silicon pixel and strip tracker. It measures charged particles within the pseudorapidity range |η| < 2.5. The tracker provides a transverse impact parameter resolution of approximately 15 μm and a resolution on pT of about 1.5% for particles with pT = 100 GeV. Matching muons to tracks measured in the silicon tracker results in a pT resolution between 1 and 10%, for pT values up to 1 TeV. A detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [37]
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