Abstract
A search for neutral Higgs bosons decaying into a b-bbar quark pair and produced in association with at least one additional b quark is presented. This signature is sensitive to the Higgs sector of the minimal supersymmetric standard model (MSSM) with large values of the parameter tan(beta). The analysis is based on data from proton-proton collisions at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.7 inverse femtobarns. The results are combined with a previous analysis based on 7 TeV data. No signal is observed. Stringent upper limits on the cross section times branching fraction are derived for Higgs bosons with masses up to 900 GeV, and the results are interpreted within different MSSM benchmark scenarios, m[h,max], m[h,mod+], m[h,mod-], light-stau and light-stop. Observed 95% confidence level upper limits on tan(beta), ranging from 14 to 50, are obtained in the m[h,mod+] benchmark scenario.
Highlights
Background modelThe main background for this analysis originates from quantum chromodynamics (QCD) multijet production, with at least two energetic jets containing b hadrons, and a third jet that passes the b tagging selection but possibly as a result of a mistag
Stringent upper limits on the cross section times branching fraction are derived for Higgs bosons with masses up to 900 GeV, and the results are interpreted within different minimal supersymmetric standard model (MSSM) benchmark scenarios, mmh ax, mmh od+, mmh od−, light-stau and light-stop
Taken into account are the QCD renormalization and factorization scale uncertainties, the uncertainties due to the parton distribution functions (PDF) and the strong coupling constant αs, and the uncertainties in the underlying event and parton shower modeling, which all only affect the translation of the signal cross section into tan β in the MSSM interpretation
Summary
The central feature of the CMS detector 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. Muons are measured in gas-ionization detectors embedded in the steel flux-return yoke, in the pseudorapidity range |η| < 2.4, with detector planes made using three technologies: drift tubes, cathode strip chambers, and resistive-plate chambers. Matching muons to tracks measured in the silicon tracker results in a pT resolution between 1% and 5%, 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. [27]
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