Search for resonant and non-resonant Higgs boson pair production in the bbτ<SUP>+</SUP>τ<SUP>-</SUP> decay channel using 13TeV pp collision data from the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H
et al (show 2845 more authors) (2023) Search for resonant and non-resonant Higgs boson pair production in the bbτ<SUP>+</SUP>τ<SUP>-</SUP> decay channel using 13TeV pp collision data from the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (7). 40-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for Higgs boson pair production in events with two <jats:italic>b</jats:italic>-jets and two <jats:italic>τ</jats:italic>-leptons is presented, using a proton–proton collision dataset with an integrated luminosity of 139 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> collected at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</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:italic>τ</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 3<jats:italic>.</jats:italic>1<jats:italic>σ</jats:italic> (2<jats:italic>.</jats:italic>0<jats:italic>σ</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>

Item Type: Article
Uncontrolled Keywords: Higgs Physics, Hadron-Hadron Scattering, Proton-Proton Scattering
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 25 Jul 2023 14:31
Last Modified: 18 Mar 2024 03:58
DOI: 10.1007/JHEP07(2023)040
Open Access URL: https://link.springer.com/article/10.1007/JHEP07(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3171901