Abstract
A search for neutral Higgs bosons of the minimal supersymmetric standard model (MSSM) and for a heavneutral Z^{prime } boson is performed using a data sample corresponding to an integrated luminosity of 3.2 fb^{-1} from proton–proton collisions at sqrt{s} = 13 {mathrm {TeV}} recorded by the ATLAS detector at the LHC. The heavy resonance is assumed to decay to a tau ^+ tau ^- pair with at least one tau lepton decaying to final states with hadrons and a neutrino. The search is performed in the mass range of 0.2–1.2 {mathrm {TeV}} for the MSSM neutral Higgs bosons and 0.5–2.5 {mathrm {TeV}} for the heavy neutral Z^{prime } boson. The data are in good agreement with the background predicted by the Standard Model. The results are interpreted in MSSM and Z^{prime } benchmark scenarios. The most stringent constraints on the MSSM m_A–tan beta space exclude at 95 % confidence level (CL) tan beta > 7.6 for m_A = 200 text {GeV} in the m_{h}^{text {mod+}} MSSM scenario. For the Sequential Standard Model, a Z^{prime }_mathrm {SSM} mass up to 1.90 {mathrm {TeV}} is excluded at 95 % CL and masses up to 1.82–2.17 {mathrm {TeV}} are excluded for a Z^{prime }_{mathrm {SFM}} of the strong flavour model.
Highlights
Background estimationThe background processes can be categorized according to whether the electron/muon and/or the τhad−vis are correctly identified
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 τ τ decay mode using 3.2 fb−1 of proton–proton collision data collected with the ATLAS detector [48] in 2015 at a centre-of-mass energy of 13 TeV
The lowest excluded cross section times branching fraction values range from σ × B R = 1.4 pb at m H/A = 200 GeV to σ × B R = 0.025 pb at m H/A = 1.2 TeV for a scalar boson produced via gluon–gluon fusion
Summary
Samples of t-channel singletop-quark events are produced with the POWHEG-BOX v1 generator employing the four-flavour scheme for the NLO matrix element calculations together with the fixed fourflavour scheme PDF set CT10f4; the top-quark decay is simulated with MadSpin [99]. For all samples of top-quark production, the spin correlations are preserved and the parton shower, fragmentation and underlying event are simulated using PYTHIA 6.428 [100] with the CTQ6L1 PDF set and the corresponding Perugia 2012 tune [101]. All simulated samples include the effect of multiple proton-proton interactions in the same and neighbouring bunch crossings (“pile-up”) by overlaying simulated minimum-bias events on each generated signal or background event These minimum-bias events are generated with PYTHIA 8.186 [90,100], using the A2 tune [107] and the MSTW2008LO PDF [108]. The Monte Carlo (MC) samples are processed through the same reconstruction software as for the data
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