Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb$^{-1}$ of data collected at $\sqrt{s}$=13 and 13.6 TeV with the ATLAS detector

ATLAS Collaboration

doi:10.1016/j.physletb.2026.140425

paper

Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb $^{- 1}$ of data collected at $s$ =13 and 13.6 TeV with the ATLAS detector

arXiv:2510.02857 · doi:10.1016/j.physletb.2026.140425

Abstract

A search for the resonant production of a heavy scalar $X$ decaying into a lighter scalar $S$ and a Higgs boson, through the process $X \to S (\to b b ˉ) H (\to γ γ)$ , where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using integrated luminosities of 140 and 59 fb $^{- 1}$ of proton-proton collision data at centre-of-mass energies of 13 and 13.6 TeV, respectively, recorded with the ATLAS detector at the LHC. The search is performed over the mass ranges of 170 $\leq$ $m_{X}$ $\leq$ 1000 GeV and 15 $\leq$ $m_{S}$ $\leq$ 500 GeV. No significant excess over the Standard Model background prediction is observed and limits at 95% confidence level are set on the product of cross section and branching fraction for the process $X \to S (\to b b ˉ) H (\to γ γ)$ at 13 TeV, ranging from 9 fb to 0.06 fb.

arXiv comment39 pages in total, author list starting page 22, 3 figures, 2 tables, published in PLB 877 (2026) 140425. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGP-2024-34/

Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb−1 of data collected at s​=13 and 13.6 TeV with the ATLAS detector

Abstract

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Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb $^{- 1}$ of data collected at $s$ =13 and 13.6 TeV with the ATLAS detector