Abstract (data abstract)

A search is performed for a new resonance X decaying into either a pair of Higgs bosons (HH) or into a Higgs boson and a new scalar boson Y (HY), using proton-proton collision data collected at $\sqrt{s}=13 \text{TeV}$, corresponding to an integrated luminosity of 138$\,\text{fb}^{-1}$. This study performs a comprehensive exploitation of the bbZZ events, encompassing the following decay topologies. One H candidate is identified through its decay into a bottom quark-antiquark pair, while the other H or the Y candidate is selected through its decay into a pair of Z bosons. One Z boson is required to decay leptonically and the other, to decay into a pair of quarks or neutrinos. Events of interest are categorized based on the Lorentz boosts of the hadronically decaying H and Z bosons. Machine-learning-based discriminants, together with the reconstructed resonance mass, are employed across the different categories to separate signal from backgrounds, and their corresponding distributions are included in a simultaneous fit. No significant deviations from the standard model predictions are observed. Upper limits at the 95% confidence level are set on the HH and HY production cross sections. For resonant HH production, the upper limit on the cross section of $\mathrm{pp}\to \mathrm{X}\to \mathrm{HH}$ production is 1 pb for a high-mass resonance. For HY production, the upper limit on the cross section of the process $\mathrm{pp}\to \mathrm{X}\to \mathrm{HY} \to \mathrm{bbZZ}$ is approximately 5 fb for a high-mass resonance. This is comparable to the sensitivity achieved in other analyses, which focus on H decays to $\gamma\gamma$ or $\tau\tau$ and Y decays into a pair of bottom quarks or massive vector bosons.

Figure 2a

Data from Figure 2 (upper left), located on page 11.

10.17182/hepdata.167417.v1/t1

Pre-fit distributions of $\Delta R(\ell,\ell)$ in the SR qq0M, combining the electron and muon channel and using all three data-taking...
Figure 2b

Data from Figure 2 (upper right), located on page 11.

10.17182/hepdata.167417.v1/t2

Pre-fit distributions of HT in the SR qq0M, combining the electron and muon channel and using all three data-taking years....
Figure 2c

Data from Figure 2 (lower left), located on page 11.

10.17182/hepdata.167417.v1/t3

Pre-fit distributions of $\Delta R(\ell_1,b_1)$ in the SR qq0M, combining the electron and muon channel and using all three data-taking...
Figure 2d

Data from Figure 2 (lower right), located on page 11.

10.17182/hepdata.167417.v1/t4

Pre-fit distributions of $\Delta R(\ell_1,b_2)$ in the SR qq0M, combining the electron and muon channel and using all three data-taking...
Figure 3a

Data from Figure 3 (upper left), located on page 13.

10.17182/hepdata.167417.v1/t5

The BDT score $\mathrm{S_{BDT}}$ distribution in the fully resolved SR qq0M. The backgrounds distributions are from post-fit; three pre-fit distributions...
Figure 3b

Data from Figure 3 (upper right), located on page 13.

10.17182/hepdata.167417.v1/t6

The resonance mass $\mathrm{m^{rec}_{X}}$ distribution in the semi-boosted SR qqZM. The backgrounds distributions are from post-fit; three pre-fit distributions of...
Figure 3c

Data from Figure 3 (lower left), located on page 13.

10.17182/hepdata.167417.v1/t7

The resonance mass $\mathrm{m^{rec}_{X}}$ distribution in the semi-boosted SR qqHM. The backgrounds distributions are from post-fit; three pre-fit distributions of...
Figure 3d

Data from Figure 3 (lower right), located on page 13.

10.17182/hepdata.167417.v1/t8

The resonance mass $\mathrm{m^{rec}_{X}}$ distribution in the fully-boosted SR qq2M. The backgrounds distributions are from post-fit; three pre-fit distributions of...
Figure 4a

Data from Figure 4 (left), located on page 14.

10.17182/hepdata.167417.v1/t9

The BDT score $\mathrm{S_{BDT}}$ distribution in the fully resolved SR $\nu\nu$0M. The backgrounds distributions are from post-fit; three pre-fit distributions...
Figure 4b

Data from Figure 4 (right), located on page 14.

10.17182/hepdata.167417.v1/t10

The transverse resonance mass $\mathrm{m^{rec}_{X\prime}}$ distribution in the boosted SR $\nu\nu$1M. The backgrounds distributions are from post-fit; three pre-fit distributions...
Figure 5

Data from Figure 5, located on page 16.

10.17182/hepdata.167417.v1/t11

Exclusion limits on the product of the production of HH through a resonance X.
Figure 6a

Data from Figure 6 (left), located on page 17.

10.17182/hepdata.167417.v1/t12

Two-dimensional exclusion limits on the product of the production of $\mathrm{pp}\rightarrow \mathrm{X} \rightarrow \mathrm{HY} \rightarrow \mathrm{bbZZ}$.
Figure 6b

Data from Figure 6 (right), located on page 17.

10.17182/hepdata.167417.v1/t13

Two-dimensional exclusion limits on the product of the production of $\mathrm{pp}\rightarrow \mathrm{X} \rightarrow \mathrm{HY} \rightarrow \mathrm{bbZZ}$.

Figure 2a

Figure 2b

Figure 2c

Figure 2d

Figure 3a

Figure 3b

Figure 3c

Figure 3d

Figure 4a

Figure 4b

Figure 5

Figure 6a

Figure 6b

JSON

YAML

YODA

YODA1

ROOT

CSV

Visualize

Ask a Question