Abstract
A search for heavy neutral Higgs bosons produced in association with one or two $b$-quarks and decaying to $b$-quark pairs is presented using 27.8 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider during 2015 and 2016. No evidence of a signal is found. Upper limits on the heavy neutral Higgs boson production cross-section times its branching ratio to $b\bar{b}$ are set, ranging from 4.0 to 0.6 pb at 95% confidence level over a Higgs boson mass range of 450 to 1400 GeV. Results are interpreted within the two-Higgs-doublet model and the minimal supersymmetric Standard Model.
Highlights
The measured properties of the Higgs boson discovered at the Large Hadron Collider (LHC) by the ATLAS and CMS collaborations [1,2] with a mass of 125 GeV are consistent with those of the scalar particle that emerges from the mechanism of electroweak symmetry breaking in the Standard Model (SM) with its one doublet of complex scalar fields [3,4,5,6]
Proton-proton collision data recorded by the ATLAS detector at the LpHCffiffi during 2015 and 2016 at a center-of-mass energy of s 1⁄4 13 TeV were used for the analysis described in this paper
In order to determine the total width at each value of mφ, a specific MSSM scenario tailored for large values of the branching ratio (B) for φ → bbwas used in which tan β 1⁄4 20, the higgsino mass parameter μ 1⁄4 −800 GeV, the generic soft-SUSYbreaking mass parameter MSUSY 1⁄4 1000 GeV, the trilinear Higgs–top-squark coupling At 1⁄4 2000 GeV, the SUð2Þ gaugino mass parameter M2 1⁄4 800 GeV, and the SUð3Þ gaugino mass parameter M3 1⁄4 1600 GeV
Summary
The measured properties of the Higgs boson discovered at the Large Hadron Collider (LHC) by the ATLAS and CMS collaborations [1,2] with a mass of 125 GeV are consistent with those of the scalar particle that emerges from the mechanism of electroweak symmetry breaking in the Standard Model (SM) with its one doublet of complex scalar fields [3,4,5,6]. The suppression of H=A couplings to WþW− and ZZ, along with ATLAS and CMS limits on new particle production, implies that searches for the heavy neutral Higgs bosons of the 2HDM mainly rely on their couplings to thirdgeneration fermions. Standard Model (MSSM) is a Type II 2HDM, which has motivated searches for heavy neutral Higgs bosons at LEP [10] and the LHC [11,12]. The φ boson is used in this paper to represent the CP-even H boson, the CP-odd A boson, or a Higgs boson mass eigenstate with an arbitrary mixture of CP-even and CP-odd eigenstates
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