CMS-PAS-HIG-24-001

CMS-PAS-HIG-24-001
Search for HHWW couplings in the VBS production of $\mathrm{W^{\pm}W^{\pm}H}$ , with $\mathrm{H\rightarrow b\bar{b}}$ decays
CMS Collaboration
27 July 2024

Abstract: A search is performed for anomalous HHWW couplings based on the process $\mathrm{pp\rightarrow W^{\pm}W^{\pm}H+jj}$ , using proton-proton collision data collected by the CMS experiment at a center-of-mass energy of $\sqrt{s}=$ 13 TeV in the LHC Run 2, corresponding to a total integrated luminosity of 138 fb $^{-1}$ . The search is performed in final states that contain a forward-backward jet pair, two W bosons that decay to same-sign leptons, and a Higgs boson that decays into two bottom quarks. Boosted decision trees are trained to separate the signal from the background. The HHWW coupling modifier $\kappa_{WW}$ is constrained at 95% confidence level to be in the interval $[-3.3, 5.3]$ , consistent with the expected interval of $[-2.4, 4.4]$ .
Links: CDS record (PDF) ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Tree-level Feynman diagrams of vector boson scattering multi-boson productions with Higgs boson in the final state, with (a) related to the Higgs self-coupling ( ${\kappa_\lambda}$ ), and (b) related to the Higgs gauge quartic coupling ( ${\kappa_{VV}}$ ).
png	Figure 1-a: Tree-level Feynman diagrams of vector boson scattering multi-boson productions with Higgs boson in the final state, with (a) related to the Higgs self-coupling ( ${\kappa_\lambda}$ ), and (b) related to the Higgs gauge quartic coupling ( ${\kappa_{VV}}$ ).
png	Figure 1-b: Tree-level Feynman diagrams of vector boson scattering multi-boson productions with Higgs boson in the final state, with (a) related to the Higgs self-coupling ( ${\kappa_\lambda}$ ), and (b) related to the Higgs gauge quartic coupling ( ${\kappa_{VV}}$ ).
png pdf	Figure 2: Data-MC comparison of $m_{jj}$ and $\Delta\eta_{jj}$ distributions in the pre-selection regions. Two signal hypotheses, with one for ${\kappa_{VV}} =$ 1 which represents the SM and the other for ${\kappa_{VV}} =$ 4.5, are plotted. The uncertainty band in the ratio plots represents the pre-fit statistical uncertainty of the Monte Carlo, which corresponds to the uncertainty band in the distribution plots.
png pdf	Figure 2-a: Data-MC comparison of $m_{jj}$ and $\Delta\eta_{jj}$ distributions in the pre-selection regions. Two signal hypotheses, with one for ${\kappa_{VV}} =$ 1 which represents the SM and the other for ${\kappa_{VV}} =$ 4.5, are plotted. The uncertainty band in the ratio plots represents the pre-fit statistical uncertainty of the Monte Carlo, which corresponds to the uncertainty band in the distribution plots.
png pdf	Figure 2-b: Data-MC comparison of $m_{jj}$ and $\Delta\eta_{jj}$ distributions in the pre-selection regions. Two signal hypotheses, with one for ${\kappa_{VV}} =$ 1 which represents the SM and the other for ${\kappa_{VV}} =$ 4.5, are plotted. The uncertainty band in the ratio plots represents the pre-fit statistical uncertainty of the Monte Carlo, which corresponds to the uncertainty band in the distribution plots.
png pdf	Figure 3: Post-fit shapes for the SR, including (a) $\ell\ell$ final state (b) $\ell\tau$ final state. The uncertainty band in the ratio plots represents the post-fit uncertainty of the Monte Carlo, which corresponds to the uncertainty band in the distribution plots.
png pdf	Figure 3-a: Post-fit shapes for the SR, including (a) $\ell\ell$ final state (b) $\ell\tau$ final state. The uncertainty band in the ratio plots represents the post-fit uncertainty of the Monte Carlo, which corresponds to the uncertainty band in the distribution plots.
png pdf	Figure 3-b: Post-fit shapes for the SR, including (a) $\ell\ell$ final state (b) $\ell\tau$ final state. The uncertainty band in the ratio plots represents the post-fit uncertainty of the Monte Carlo, which corresponds to the uncertainty band in the distribution plots.
png pdf	Figure 4: Limits of $\kappa_{VV}$ with CL=95%.

Tables
png pdf	Table 1: Input variables used for the event kinematics BDT.
png pdf	Table 2: The post-fit yields of the CR, for $\ell\ell$ and $\ell\tau$ categories separately. The errors for total background include the statistical and systematic uncertainties.

Summary

Data recorded with the CMS experiment during LHC Run 2 amounting to 138

$\mathrm{fb}^{-1}$ of pp collisions at

$\sqrt{s}=$ 13 TeV are used to search for anomalous couplings in the process

$\mathrm{pp} \rightarrow \mathrm{W}^{ \pm} \mathrm{W}^{ \pm} \mathrm{H}+\mathrm{jj}$ , where the Higgs boson decays to two bottom quarks and the W bosons decay leptonically. The analysis focuses on the channel in which the two b-jets are merged. The observed(expected) 95% CL interval for

$\kappa_{WW}$ is

$[-3.3, 5.3]$ (

$[-2.4, 4.4]$ ). This marks the first analysis of the

$\mathrm{pp} \rightarrow \mathrm{W}^{ \pm} \mathrm{W}^{ \pm} \mathrm{H}+\mathrm{jj}$ process and opens the possibility of further analysis of the same process with different final states.

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