Search for non-resonant Higgs boson pair production in the $ 2b+2\ell +{E}_{\textrm{T}}^{\textrm{miss}} $ final state in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

Aad, Georges; Abbott, Braden Keim; Abeling, Kira; Abicht, Nils Julius; Abidi, Haider; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso; Abulaiti, Yiming; Acharya, Bobby Samir

doi:10.1007/JHEP02(2024)037

Search for non-resonant Higgs boson pair production in the $2b+2\ell +{E}_{\textrm{T}}^{\textrm{miss}}$ final state in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

ATLAS

Collaboration

Oct 17, 2023

48 pages

Published in:

JHEP 02 (2024) 037,
JHEP 02 (2024) 037

Published: Feb 7, 2024

e-Print:

2310.11286 [hep-ex]

DOI:

10.1007/JHEP02(2024)037

Report number:

CERN-EP-2023-233

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

datasets

reference search21 citations

Citations per year

Abstract: (Springer)

A search for non-resonant Higgs boson pair (HH) production is presented, in which one of the Higgs bosons decays to a b-quark pair (

b\overline{b}

) and the other decays to WW

^{*}

, ZZ

^{*}

, or τ

^{+}

τ

^{−}

, with in each case a final state with ℓ

^{+}

ℓ

^{−}

+ neutrinos (ℓ = e, μ). The analysis targets separately the gluon-gluon fusion and vector boson fusion production modes. Data recorded by the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb

^{−1}

, are used in this analysis. Events are selected to have exactly two b-tagged jets and two leptons with opposite electric charge and missing transverse momentum in the final state. These events are classified using multivariate analysis algorithms to separate the HH events from other Standard Model processes. No evidence of the signal is found. The observed (expected) upper limit on the cross-section for non-resonant Higgs boson pair production is determined to be 9.7 (16.2) times the Standard Model prediction at 95% confidence level. The Higgs boson self-interaction coupling parameter κ

_{λ}

and the quadrilinear coupling parameter κ

_{2V}

are each separately constrained by this analysis to be within the ranges [−6.2, 13.3] and [−0.17, 2.4], respectively, at 95% confidence level, when all other parameters are fixed.[graphic not available: see fulltext]

Note:

48 pages in total, author list starting page 31, 7 figures, 5 tables. All figures and tables including auxiliary figures and tables are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-02

Hadron-Hadron Scattering
Higgs Physics
Proton-Proton Scattering
p p: colliding beams
Higgs particle: pair production
p p: scattering
Higgs particle: decay modes
Higgs particle: hadronic decay
bottom: pair production
Higgs particle: leptonic decay

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