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 √<i>s</i>=13 TeV with the ATLAS detector
JOURNAL OF HIGH ENERGY PHYSICS, vol.2024, no.10, 2024 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 2024 Issue: 10
- Publication Date: 2024
- Doi Number: 10.1007/jhep10(2024)104
- Journal Name: JOURNAL OF HIGH ENERGY PHYSICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Keywords: Hadron-Hadron Scattering, Higgs Physics
- Open Archive Collection: AVESIS Open Access Collection
- Ankara University Affiliated: Yes
Abstract
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 mu) from the decay of vector bosons originating from the S particle, S -> (WW -/+)-W-+/-/ZZ, and two photons from the Higgs boson decay, H -> gamma gamma. 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.