Abstract
A search for heavy neutral Higgs bosons and Z′ bosons is performed using a data sample corresponding to an integrated luminosity of 36.1 fb−1 from proton-proton collisions at sqrt{s}=13 TeV recorded by the ATLAS detector at the LHC during 2015 and 2016. The heavy resonance is assumed to decay to τ+τ− with at least one tau lepton decaying to final states with hadrons and a neutrino. The search is performed in the mass range of 0.2-2.25 TeV for Higgs bosons and 0.2-4.0 TeV for Z′ bosons. The data are in good agreement with the background predicted by the Standard Model. The results are interpreted in benchmark scenarios. In the context of the hMSSM scenario, the data exclude tan β > 1.0 for mA = 0.25 TeV and tan β > 42 for mA = 1.5 TeV at the 95% confidence level. For the Sequential Standard Model, ZSSM′ with mZ′ < 2.42 TeV is excluded at 95% confidence level, while ZNU′ with mZ ′ < 2.25 TeV is excluded for the non-universal G(221) model that exhibits enhanced couplings to third-generation fermions.
Highlights
The discovery of a scalar particle [1, 2] at the Large Hadron Collider (LHC) [3] has provided important insight into the mechanism of electroweak symmetry breaking
A search for heavy neutral Higgs bosons and Z bosons is performed using a data sampl√e corresponding to an integrated luminosity of 36.1 fb−1 from proton-proton collisions at s = 13 TeV recorded by the ATLAS detector at the LHC during 2015 and 2016
This paper presents the results of a search for neutral Minimal Supersymmetric Standard Model (MSSM) Higgs bosons as well as high-mass Z resonances in the ditau decay mode using 36.1 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV collected with the ATLAS detector [43] in 2015 and 2016
Summary
The discovery of a scalar particle [1, 2] at the Large Hadron Collider (LHC) [3] has provided important insight into the mechanism of electroweak symmetry breaking. The couplings of the MSSM heavy Higgs bosons to down-type fermions are enhanced with respect to the SM Higgs boson for large tan β values, resulting in increased branching fractions to τ leptons and b-quarks, as well as a higher cross section for Higgs boson production in association with b-quarks This has motivated a variety of searches for a scalar boson (generically called φ) in τ τ and bb final states at LEP [22], the Tevatron [23,24,25] and the LHC [26,27,28,29]. This paper presents the results of a search for neutral MSSM Higgs bosons as well as high-mass Z resonances in the ditau decay mode using 36.1 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV collected with the ATLAS detector [43] in 2015 and 2016.
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