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

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ATLAS Collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

ATLAS Collaboration (2020). Reconstruction and identification of boosted di-$τ$ systems in a search for Higgs boson pairs using 13 TeV proton$-$proton collision data in ATLAS. Journal of High Energy Physics, 11, 163. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-129.


Cite as: https://hdl.handle.net/21.11116/0000-0008-1C55-A
Abstract
In this paper, a novel technique, referred to as the di-$\tau$ tagger, is designed to reconstruct and identify hadronically decaying $\tau^+\tau^-$ pairs with a large Lorentz boost 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.