Search for resonant and non-resonant Higgs boson pair production in the $b\bar bτ^+τ^-$ decay channel using 13 TeV $pp$ collision data from the ATLAS detector



Collaboration, ATLAS
(2022) Search for resonant and non-resonant Higgs boson pair production in the $b\bar bτ^+τ^-$ decay channel using 13 TeV $pp$ collision data from the ATLAS detector. [Preprint]

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Abstract

A search for Higgs boson pair production in events with two $b$-jets and two $\tau$-leptons is presented, using a proton-proton collision dataset with an integrated luminosity of 139 fb$^{-1}$ collected at $\sqrt{s}=13$ TeV by the ATLAS experiment at the LHC. Higgs boson pairs produced non-resonantly or in the decay of a narrow scalar resonance in the mass range from 251 to 1600 GeV are targeted. Events in which at least one $\tau$-lepton decays hadronically are considered, and multivariate discriminants are used to reject the backgrounds. No significant excess of events above the expected background is observed in the non-resonant search. The largest excess in the resonant search is observed at a resonance mass of 1 TeV, with a local (global) significance of $3.1\sigma$ ($2.0\sigma$). Observed (expected) 95% confidence-level upper limits are set on the non-resonant Higgs boson pair-production cross-section at 4.7 (3.9) times the Standard Model prediction, assuming Standard Model kinematics, and on the resonant Higgs boson pair-production cross-section at between 21 and 900 fb (12 and 840 fb), depending on the mass of the narrow scalar resonance.

Item Type: Preprint
Additional Information: 59 pages in total, author list starting page 42, 10 figures, 6 tables, published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-40
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 27 Oct 2022 16:29
Last Modified: 01 Aug 2023 20:26
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3165789