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A search is conducted for a new scalar boson $S$, with a mass distinct fromthat of the Higgs boson, decaying into four leptons ($\ell =$ $e$, $\mu$) viaan intermediate state containing two on-shell, promptly decaying new spin-1bosons $Z_\text{d}$: $S \rightarrow Z_\text{d}Z_\text{d} \rightarrow 4\ell$,where the $Z_\text{d}$ boson has a mass between 15 and 300 GeV, and the $S$boson has a mass between either 30 and 115 GeV or 130 and 800 GeV. The searchuses proton-proton collision data collected with the ATLAS detector at theLarge Hadron Collider with an integrated luminosity of 139 fb$^{-1}$ at acentre-of-mass energy of $\sqrt{s}=13$ TeV. No significant excess above theStandard Model background expectation is observed. Upper limits at 95%confidence level are set on the production cross-section times branching ratio,$\sigma(gg \to S) \times \mathcal{B}(S\rightarrow Z_\text{d}Z_\text{d}\rightarrow 4\ell)$, as a function of the mass of both particles, $m_S$ and$m_{Z\text{d}}$.

Search for a new scalar decaying into new spin-1 bosons in four-lepton final states with the ATLAS detector