Search for a resonance decaying into a scalar particle and a Higgs boson in final states with leptons and two photons in proton-proton collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector - INSPIRE

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Search for a resonance decaying into a scalar particle and a Higgs boson in final states with leptons and two photons in proton-proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

ATLAS

Collaboration

May 31, 2024

46 pages

Published in:

JHEP 10 (2024) 104,
JHEP 10 (2024) 104

Published: Oct 11, 2024
and
Published: Oct, 2024

e-Print:

2405.20926 [hep-ex]

DOI:

10.1007/JHEP10(2024)104

Report number:

CERN-EP-2024-147

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

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Abstract: (Springer)

A search for a hypothetical heavy scalar particle, X, decaying into a singlet scalar particle, S, and a Standard Model Higgs boson, H, using 140 fb

^{−1}

of proton-proton collision data at the centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the LHC is presented. The explored mass range is 300 ≤ m

_{X}

≤ 1000 GeV and 170 ≤ m

_{S}

≤ 500 GeV. The signature of this search is one or two leptons (e or μ) from the decay of vector bosons originating from the S particle, S → W

^{±}

W

^{∓}

/ZZ, and two photons from the Higgs boson decay, H → γγ. No significant excess is observed above the expected Standard Model background. The observed (expected) upper limits at the 95% confidence level on the cross- section for gg → X → SH, assuming the same S → WW/ZZ branching ratios as for a SM-like heavy Higgs boson, are between 530 (800) fb and 120 (170) fb.[graphic not available: see fulltext]

Note:

46 pages in total, author list starting page 29, 8 figures, 4 tables, published by JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2021-23/

Hadron-Hadron Scattering
Higgs Physics
p p: scattering
p p: colliding beams
resonance: production
resonance: scalar
resonance: decay modes
resonance: heavy
resonance: mass
Higgs particle: heavy

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