Abstract (data abstract)

A search is conducted for a new scalar boson $S$, with a mass distinct from that of the Higgs boson, decaying promptly into four leptons ($\ell =$ $e$, $\mu$) via an intermediate state containing two on-shell, promptly decaying new spin-1 bosons $Z_{d}$: $S \rightarrow Z_{d}Z_{d} \rightarrow 4\ell$, where the $Z_{d}$ 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 search uses proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider with an integrated luminosity of 139 fb$^{-1}$ at a centre-of-mass energy of $\sqrt{s}=13$ TeV. No significant excess above the Standard Model background expectation is observed. Upper limits at 95% confidence level are set on the production cross-section times branching ratio, $\sigma(gg \rightarrow S) \times \mathcal{B}(S\rightarrow Z_{d}Z_{d} \rightarrow 4\ell)$, as a function of the mass of both particles, $S$ and $m_{Z_{d}}$.

Average dilepton mass distribution in SR1

Data from Figure 1a.

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Average dilepton mass distribution $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ in Signal Region 1.
Average dilepton mass distribution in SR2

Data from Figure 1b.

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Average dilepton mass distribution $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ in Signal Region 2.
Total invariant mass distribution in SR1

Data from Figure 2a.

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Total invariant mass distribution $m_{4\ell}$ in Signal Region 1.
Total invariant mass distribution in SR2

Data from Figure 2b.

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Total invariant mass distribution $m_{4\ell}$ in Signal Region 2.
Total invariant mass vs average dilepton mass of data, in SR1

Data from Figure 3a.

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Selected events in the ($m_{4\ell}$, $\left\langle m_{\ell\ell}\right\rangle$) plane, SR1
Total invariant mass vs average dilepton mass of data, in SR2

Data from Figure 3b.

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Selected events in the ($m_{4\ell}$, $\left\langle m_{\ell\ell}\right\rangle$) plane, SR2
Total invariant mass vs average dilepton mass of background, SR1

Data from Figure 4a.

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Expected background events in the $(m_{4\ell}, \langle m_{\ell\ell}\rangle)$ plane, SR1
Total invariant mass vs average dilepton mass of signal, in SR1

Data from Figure 4b.

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Expected signal shape for $(m_{S}, m_{Z_d}) = (110~\text{GeV},30~\text{GeV}$) in the $(m_{4\ell}, \langle m_{\ell\ell}\rangle)$ plane, SR1. The signal distributions are normalized...
Total invariant mass vs average dilepton mass of background, SR2

Data from Figure 4c.

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Expected background events in the $(m_{4\ell}, \langle m_{\ell\ell}\rangle)$ plane, SR2. Events that satisfy $|m_{ab,cd} - m_Z| < 8~\text{GeV}$ are removed...
Total invariant mass vs average dilepton mass of signal, in SR2

Data from Figure 4d.

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Expected signal shape for $(m_{S}, m_{Z_{d}}) = (750~\text{GeV},150~\text{GeV}$) in the $(m_{4\ell}, \langle m_{\ell\ell}\rangle)$ plane, SR2. The signal distributions are normalized...
95% CL expected limit in SR1

Data from Figure 5a.

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Expected 95% CL limit on $\sigma \mathcal{B}(S\rightarrow Z_{d}Z_{d} \rightarrow 4\ell)$, SR1
95% CL observed limit in SR1

Data from Figure 5b.

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Observed 95% CL limit on $\sigma \mathcal{B}(S\rightarrow Z_{d}Z_{d} \rightarrow 4\ell)$, SR1
95% CL limit ratio in SR1

Data from Figure 5c.

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Observed / Expected 95% CL limit ratio in SR1
95% CL expected limit in SR2

Data from Figure 5d.

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Expected 95% CL limit on $\mathcal{B}(S\rightarrow Z_{d}Z_{d} \rightarrow 4\ell)$ with Z-veto, SR2
95% CL observed limit in SR2

Data from Figure 5e.

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Observed 95% CL limit on $\sigma \mathcal{B}(S\rightarrow Z_{d}Z_{d} \rightarrow 4\ell)$ with Z-veto, SR2
95% CL limit ratio with Z-veto in SR2

Data from Figure 5f.

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Observed / Expected 95% CL limit ratio with Z-veto, SR2
Local p0-values distribution in SR1

Data from Figure 6a.

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Local $p_0$-values in the ($m_{S}, m_{Z_{d}}$) plane, SR1
Local p0-values distribution in SR2

Data from Figure 6b.

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Local $p_0$-values in the ($m_{S}, m_{Z_{d}}$) plane, SR2 with Z-veto applied
Observed data distribution in SR1

Data from Auxiliary Figure 2a.

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Observed data in Signal Region 1 in the $(m_{4\ell}, \langle m_{\ell\ell}\rangle)$ plane.
Observed data distibution with Z-veto in SR2

Data from Auxiliary Figure 2b.

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Observed data in Signal Region 2 in the $(m_{4\ell}, \langle m_{\ell\ell}\rangle)$ plane. Events that satisfy $|m_{ab,cd} - m_Z| < 8~\text{GeV}$...
Average dilepton mass distribution in SR1 for 4e channel

Data from Auxiliary Figure 5a.

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Distributions of the average dilepton mass $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ for Signal Region 1 in the $4e$ final...
Average dilepton mass distribution in SR1 for 2e2mu channel

Data from Auxiliary Figure 5b.

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Distributions of the average dilepton mass $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ for Signal Region 1 in the $2e2\mu$ final...
Average dilepton mass distribution in SR1 for 4mu channel

Data from Auxiliary Figure 5c.

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Distributions of the average dilepton mass $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ for Signal Region 1 in the $4\mu$ final...
Average dilepton mass distribution in SR2 for 4e channel

Data from Auxiliary Figure 5d.

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Distributions of the average dilepton mass $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ for Signal Region 2 in the $4e$ final...
Average dilepton mass distribution in SR2 for 2e2mu channel

Data from Auxiliary Figure 5e.

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Distributions of the average dilepton mass $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ for Signal Region 2 in the $2e2\mu$ final...
Average dilepton mass distribution in SR2 for 4mu channel

Data from Auxiliary Figure 5f.

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Distributions of the average dilepton mass $\left\langle m_{\ell\ell}\right\rangle = \frac{1}{2}\left(m_{ab} + m_{cd}\right)$ for Signal Region 2 in the $4\mu$ final...
Total invariant mass distribution in SR1 for 4e channel

Data from Auxiliary Figure 6a.

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Distributions of the total invariant mass $m_{4\ell}$ for Signal Region 1 in the $4e$ final state. The SR1 requirement $m_{4\ell}...
Total invariant mass distribution in SR1 for 2e2mu channel

Data from Auxiliary Figure 6b.

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Distributions of the total invariant mass $m_{4\ell}$ for Signal Region 1 in the $2e2\mu$ final state. The SR1 requirement $m_{4\ell}...
Total invariant mass distribution in SR1 for 4mu channel

Data from Auxiliary Figure 6c.

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Distributions of the total invariant mass $m_{4\ell}$ for Signal Region 1 in the $4\mu$ final state. The SR1 requirement $m_{4\ell}...
Total invariant mass distribution in SR2 for 4e channel

Data from Auxiliary Figure 6d.

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Distributions of the total invariant mass $m_{4\ell}$ for Signal Region 2 in the $4e$ final state.
Total invariant mass distribution in SR2 for 2e2mu channel

Data from Auxiliary Figure 6e.

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Distributions of the total invariant mass $m_{4\ell}$ for Signal Region 2 in the $2e2\mu$ final state.
Total invariant mass distribution in SR2 for 4mu channel

Data from Auxiliary Figure 6f.

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Distributions of the total invariant mass $m_{4\ell}$ for Signal Region 2 in the $4\mu$ final state.

Average dilepton mass distribution in SR1

Average dilepton mass distribution in SR2

Total invariant mass distribution in SR1

Total invariant mass distribution in SR2

Total invariant mass vs average dilepton mass of data, in SR1

Total invariant mass vs average dilepton mass of data, in SR2

Total invariant mass vs average dilepton mass of background, SR1

Total invariant mass vs average dilepton mass of signal, in SR1

Total invariant mass vs average dilepton mass of background, SR2

Total invariant mass vs average dilepton mass of signal, in SR2

95% CL expected limit in SR1

95% CL observed limit in SR1

95% CL limit ratio in SR1

95% CL expected limit in SR2

95% CL observed limit in SR2

95% CL limit ratio with Z-veto in SR2

Local p0-values distribution in SR1

Local p0-values distribution in SR2

Observed data distribution in SR1

Observed data distibution with Z-veto in SR2

Average dilepton mass distribution in SR1 for 4e channel

Average dilepton mass distribution in SR1 for 2e2mu channel

Average dilepton mass distribution in SR1 for 4mu channel

Average dilepton mass distribution in SR2 for 4e channel

Average dilepton mass distribution in SR2 for 2e2mu channel

Average dilepton mass distribution in SR2 for 4mu channel

Total invariant mass distribution in SR1 for 4e channel

Total invariant mass distribution in SR1 for 2e2mu channel

Total invariant mass distribution in SR1 for 4mu channel

Total invariant mass distribution in SR2 for 4e channel

Total invariant mass distribution in SR2 for 2e2mu channel

Total invariant mass distribution in SR2 for 4mu channel

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