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Search for resonant and non-resonant Higgs boson pair production in the bb¯ τ+τ decay channel using 13 TeV pp collision data from the ATLAS detector

Published version
Peer-reviewed

Repository DOI


Change log

Authors

Aad, G 
Abbott, B 
Abbott, DC 
Abed Abud, A 
Abeling, K 

Abstract

jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pA search for Higgs boson pair production in events with two jats:italicb</jats:italic>-jets and two jats:italicτ</jats:italic>-leptons is presented, using a proton–proton collision dataset with an integrated luminosity of 139 fbjats:supjats:italic−</jats:italic>1</jats:sup> collected at jats:inline-formulajats:alternativesjats:tex-math$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msqrt mml:mis</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 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 jats:italicτ</jats:italic>-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 3jats:italic.</jats:italic>1jats:italicσ</jats:italic> (2jats:italic.</jats:italic>0jats:italicσ</jats:italic>). 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.</jats:p>

Description

Keywords

Higgs Physics, Hadron-Hadron Scattering, Proton-Proton Scattering

Journal Title

Journal of High Energy Physics

Conference Name

Journal ISSN

1029-8479
1029-8479

Volume Title

2023

Publisher

Springer Science and Business Media LLC