Search for a new heavy scalar particle decaying into a Higgs boson and a new scalar singlet in final states with one or two light leptons and a pair of τ-leptons with the ATLAS detector
Collaboration
46 pages
Published in:
- JHEP 10 (2023) 009
- Published: Oct 3, 2023
e-Print:
- 2307.11120 [hep-ex]
PDG: Other Mass Limits
Report number:
- CERN-EP-2023-125
Experiments:
- CERN-LHC-ATLAS,
- CERN-LHC-ATLAS
Citations per year
Abstract: (Springer)
A search for a new heavy scalar particle X decaying into a Standard Model (SM) Higgs boson and a new singlet scalar particle S is presented. The search uses a proton-proton (pp) collision data sample with an integrated luminosity of 140 fb recorded at a centre-of-mass energy of = 13 TeV with the ATLAS detector at the Large Hadron Collider. The most sensitive mass parameter space is explored in X mass ranging from 500 to 1500 GeV, with the corresponding S mass in the range 200–500 GeV. The search selects events with two hadronically decaying τ-lepton candidates from H → ττ decays and one or two light leptons (ℓ = e, μ) from S → VV (V = W, Z) decays while the remaining V boson decays hadronically or to neutrinos. A multivariate discriminant based on event kinematics is used to separate the signal from the background. No excess is observed beyond the expected SM background and 95% confidence level upper limits between 72 fb and 542 fb are derived on the cross-section σ(pp → X → SH) assuming the same SM-Higgs boson-like decay branching ratios for the S → VV decay. Upper limits on the visible cross-sections σ(pp → X → SH → WWττ) and σ(pp → X → SH → ZZττ) are also set in the ranges 3–26 fb and 6–33 fb, respectively.[graphic not available: see fulltext]Note:
- 46 pages in total, author list starting page 28, 5 figures, 5 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2022-44
- Hadron-Hadron Scattering
- p p: scattering
- p p: colliding beams
- scalar particle: heavy
- scalar particle: singlet
- scalar particle: decay modes
- vector boson: pair production
- vector boson: decay modes
- scalar particle: mass
- singlet: scalar
References(90)
Figures(22)
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