Abstract
A search for heavy neutral Higgs bosons is performed using the LHC Run 2 data, corresponding to an integrated luminosity of 139 fb^{-1} of proton-proton collisions at sqrt[s]=13 TeV recorded with the ATLAS detector. The search for heavy resonances is performed over the mass range 0.2-2.5TeV for the τ^{+}τ^{-} decay with at least one τ-lepton decaying into final states with hadrons. The data are in good agreement with the background prediction of the standard model. In the M_{h}^{125} scenario of the minimal supersymmetric standard model, values of tanβ>8 and tanβ>21 are excluded at the 95%confidence level for neutral Higgs boson masses of 1.0 and 1.5TeV, respectively, where tanβ is the ratio of the vacuum expectation values of the two Higgs doublets.
Highlights
2 data, corresponding TeV recorded with the ATLAS detector
Many theoretical models beyond the standard model (SM), such as two-Higgs-doublet models (2HDMs) [8], extend the Higgs sector to include a second Higgs doublet which implies the existence of new heavy pseudoscalar (A) and scalar (H) states, while the observed scalar particle would correspond to the lightest Higgs boson (h)
The decay probability of these scalar states into τþτ− pairs can be enhanced relative to other decay modes in 2HDMs of type II, such as the minimal supersymmetric SM (MSSM) [9,10], the minimal extension of the SM that realizes supersymmetry [11,12,13,14,15,16]
Summary
See text See text NNLO [78] NNLO [78] NLO NNLO þ NNLL [81,82,83,84,85,86,87] NNLO þ NNLL [91,92]. The dominant background contribution in the τlepτhad channel arises from processes where the τhad-vis candidate originates from a jet Such background events are divided into those where the selected lepton is correctly identified, mainly from W þ jets (tt) production in the b-veto (b-tag) category, and those where the selected lepton arises from a jet, mainly from multijet production. The τ-lepton fake-factor weights measured in data are applied to the events in CR-1 to estimate the W þ jets (tt) background in the signal region Backgrounds where both the lepton and τhad-vis candidates originate from electrons, muons or τ leptons arise from Z=γà → ττ production in the b-veto category and tt production in the b-tag category,
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