Abstract (data abstract)

This paper presents a search for new physics through the process where a new massive particle, X, decays into a Higgs boson and a second particle, Y. The Higgs boson subsequently decays into a bottom quark-antiquark pair, reconstructed as a single large-radius jet. The decay products of Y are also assumed to produce a single large-radius jet. The identification of the Y particle is enhanced by computing the anomaly score of its candidate jet using an autoencoder, which measures deviations from typical QCD multijet jets. This allows a simultaneous search for multiple Y decay scenarios within a single analysis. In the main benchmark process, Y is a scalar particle that decays into $W^+ W^-$. Two other benchmark processes are also considered, where Y is a scalar particle decaying into a light quark-antiquark pair, or into a top quark-antiquark pair. The last benchmark considers Y as a hadronically decaying top quark, arising from the decay of a vector-like quark into a top quark and a Higgs boson. Data recorded by the CMS experiment at a center-of-mass energy of 13 TeV in 2016--2018, and corresponding to an integrated luminosity of 138 fb$^{-1}$, are analyzed. No significant excess is observed, and upper limits on the benchmark signal cross section for various masses of X and Y, at $95\%$ confidence level, are placed.

Figure 2 (upper left)

Data from Figure 2 (upper left)

10.17182/hepdata.158363.v1/t1

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 2 (upper right)

Data from Figure 2 (upper right)

10.17182/hepdata.158363.v1/t2

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 2 (lower left)

Data from Figure 2 (lower left)

10.17182/hepdata.158363.v1/t3

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 2 (lower right)

Data from Figure 2 (lower right)

10.17182/hepdata.158363.v1/t4

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 3 (upper left)

Data from Figure 3 (upper left)

10.17182/hepdata.158363.v1/t5

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 3 (upper right)

Data from Figure 3 (upper right)

10.17182/hepdata.158363.v1/t6

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 3 (lower left)

Data from Figure 3 (lower left)

10.17182/hepdata.158363.v1/t7

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 3 (lower right)

Data from Figure 3 (lower right)

10.17182/hepdata.158363.v1/t8

The $m_{jj}$ and $m_{J}$ projections for the number of observed events (black markers) compared with the backgrounds estimated in the...
Figure 4

Data from Figure 4

10.17182/hepdata.158363.v1/t9

The expected and observed 95% confidence level upper limits on the cross section $\sigma(\mathrm{pp} \to \mathrm{X} \to (\mathrm{H} \to b\bar{b})(\mathrm{Y}...
Figure 5 (upper left)

Data from Figure 5 (upper left)

10.17182/hepdata.158363.v1/t10

The median expected (dashed line) and observed (solid line) 95% confidence level upper limits on the main and three alternative...
Figure 5 (upper right)

Data from Figure 5 (upper right)

10.17182/hepdata.158363.v1/t11

The median expected (dashed line) and observed (solid line) 95% confidence level upper limits on the main and three alternative...
Figure 5 (lower left)

Data from Figure 5 (lower left)

10.17182/hepdata.158363.v1/t12

The median expected (dashed line) and observed (solid line) 95% confidence level upper limits on the main and three alternative...
Figure 5 (lower right)

Data from Figure 5 (lower right)

10.17182/hepdata.158363.v1/t13

The median expected (dashed line) and observed (solid line) 95% confidence level upper limits on the main and three alternative...
Auxiliary table 1: Benchmark signal efficiency

Auxiliary

10.17182/hepdata.158363.v1/t14

Selection efficiency as a function of MX and MY
Auxiliary table 2:$Y \rightarrow bq\bar{q}$ signal efficiency

Auxiliary

10.17182/hepdata.158363.v1/t15

Selection efficiency as a function of MX for fixed MY
Auxiliary table 3: $Y \rightarrow t\bar{t}$ signal efficiency

Auxiliary

10.17182/hepdata.158363.v1/t16

Selection efficiency as a function of MX for fixed MY
Auxiliary table 4: $Y \rightarrow u\bar{u}$ signal efficiency

Auxiliary

10.17182/hepdata.158363.v1/t17

Selection efficiency as a function of MX for fixed MY

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Figure 2 (lower right)

Figure 3 (upper left)

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Figure 3 (lower left)

Figure 3 (lower right)

Figure 4

Figure 5 (upper left)

Figure 5 (upper right)

Figure 5 (lower left)

Figure 5 (lower right)

Auxiliary table 1: Benchmark signal efficiency

Auxiliary table 2:$Y \rightarrow bq\bar{q}$ signal efficiency

Auxiliary table 3: $Y \rightarrow t\bar{t}$ signal efficiency

Auxiliary table 4: $Y \rightarrow u\bar{u}$ signal efficiency

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