Reconstruction and identification of boosted di-<i>τ</i> systems in a search for Higgs boson pairs using 13 TeV proton-proton collision data in ATLAS



Aad, G, Abbott, B, Abbott, DC, Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2946 more authors) (2020) Reconstruction and identification of boosted di-<i>τ</i> systems in a search for Higgs boson pairs using 13 TeV proton-proton collision data in ATLAS. JOURNAL OF HIGH ENERGY PHYSICS, 11 (11). 163-.

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Abstract

In this paper, a new technique for reconstructing and identifying hadronically decaying $\tau^+\tau^-$ pairs with a large Lorentz boost, referred to as the di-$\tau$ tagger, is developed and used for the first time in the ATLAS experiment at the Large Hadron Collider. A benchmark di-$\tau$ tagging selection is employed in the search for resonant Higgs boson pair production, where one Higgs boson decays into a boosted $b\bar{b}$ pair and the other into a boosted $\tau^+\tau^-$ pair, with two hadronically decaying $\tau$-leptons in the final state. Using 139 fb$^{-1}$ of proton$-$proton collision data recorded at a centre-of-mass energy of 13 TeV, the efficiency of the di-$\tau$ tagger is determined and the background with quark- or gluon-initiated jets misidentified as di-$\tau$ objects is estimated. The search for a heavy, narrow, scalar resonance produced via gluon$-$gluon fusion and decaying into two Higgs bosons is carried out in the mass range 1$-$3 TeV using the same dataset. No deviations from the Standard Model predictions are observed, and 95% confidence-level exclusion limits are set on this model.

Item Type: Article
Additional Information: 46 pages in total, author list starting page 30, 13 figures, 3 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-22
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron scattering (experiments), Higgs physics, Tau Physics
Depositing User: Symplectic Admin
Date Deposited: 13 Jan 2021 11:46
Last Modified: 11 Oct 2023 04:26
DOI: 10.1007/JHEP11(2020)163
Open Access URL: https://link.springer.com/article/10.1007%2FJHEP11...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3111610