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| CMS-B2G-20-004 ; CERN-EP-2024-030 | ||
| Search for resonant pair production of Higgs bosons in the $ \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}} $ final state using large-area jets in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 18 July 2024 | ||
| Submitted to J. High Energy Phys. | ||
| Abstract: A search is presented for the resonant production of a pair of standard model-like Higgs bosons using data from proton-proton collisions at a centre-of-mass energy of 13 TeV, collected by the CMS experiment at the CERN LHC in 2016-2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The final state consists of two b quark-antiquark pairs. The search is conducted in the region of phase space where at least one of the pairs is highly Lorentz-boosted and is reconstructed as a single large-area jet. The other pair may be either similarly merged or resolved, the latter reconstructed using two b-tagged jets. The data are found to be consistent with standard model processes and are interpreted as 95% confidence level upper limits on the product of the cross sections and the branching fractions of the spin-0 radion and the spin-2 bulk graviton that arise in warped extradimensional models. The limits set are in the range 9.74-0.29 fb and 4.94-0.19 fb for a narrow radion and a graviton, respectively, with masses between 1 and 3 TeV. For a radion and for a bulk graviton with widths 10% of their masses, the limits are in the range 12.5-0.35 fb and 8.23-0.23 fb, respectively, for the same masses. These limits result in the exclusion of a narrow-width graviton with a mass below 1.2 TeV, and of narrow and 10%-width radions with masses below 2.6, and 2.9 TeV, respectively. | ||
| Links: e-print arXiv:2407.13872 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
A diagram showing tight-tight (TT, purple) and loose-loose (LL, blue) pass regions (solid) and their corresponding fail regions (dash-dotted). |
png pdf |
Figure 2:
Slices of 2D distributions of observed events and the post-fit templates in the LL signal region, projected onto the plane of leading jet mass $ m_{\text{J}_{1}} $ (left) and corrected HH mass $ m_\text{HH} $ (right) axes, together with the signal expected for a radion of mass 1.5 TeV. For this and following figures, the value of $ \sigma $ in the lower panel is $ \sigma = \sqrt{\sigma_\text{bkg}^2 + \sigma_\text{data}^2} $, where $ \sigma_\text{bkg} $ is the total uncertainty in the background and $ \sigma_\text{data} $ is the statistical uncertainty associated with the number of data events in a particular bin. |
png pdf |
Figure 2-a:
Slices of 2D distributions of observed events and the post-fit templates in the LL signal region, projected onto the plane of leading jet mass $ m_{\text{J}_{1}} $ (left) and corrected HH mass $ m_\text{HH} $ (right) axes, together with the signal expected for a radion of mass 1.5 TeV. For this and following figures, the value of $ \sigma $ in the lower panel is $ \sigma = \sqrt{\sigma_\text{bkg}^2 + \sigma_\text{data}^2} $, where $ \sigma_\text{bkg} $ is the total uncertainty in the background and $ \sigma_\text{data} $ is the statistical uncertainty associated with the number of data events in a particular bin. |
png pdf |
Figure 2-b:
Slices of 2D distributions of observed events and the post-fit templates in the LL signal region, projected onto the plane of leading jet mass $ m_{\text{J}_{1}} $ (left) and corrected HH mass $ m_\text{HH} $ (right) axes, together with the signal expected for a radion of mass 1.5 TeV. For this and following figures, the value of $ \sigma $ in the lower panel is $ \sigma = \sqrt{\sigma_\text{bkg}^2 + \sigma_\text{data}^2} $, where $ \sigma_\text{bkg} $ is the total uncertainty in the background and $ \sigma_\text{data} $ is the statistical uncertainty associated with the number of data events in a particular bin. |
png pdf |
Figure 3:
Slices of 2D distributions of observed events and the post-fit templates in the TT signal region, projected onto the $ m_{\text{J}_{1}} $ (left) and $ m_\text{HH} $ (right) axes, together with the signal expected for a radion of mass 1.5 TeV. |
png pdf |
Figure 3-a:
Slices of 2D distributions of observed events and the post-fit templates in the TT signal region, projected onto the $ m_{\text{J}_{1}} $ (left) and $ m_\text{HH} $ (right) axes, together with the signal expected for a radion of mass 1.5 TeV. |
png pdf |
Figure 3-b:
Slices of 2D distributions of observed events and the post-fit templates in the TT signal region, projected onto the $ m_{\text{J}_{1}} $ (left) and $ m_\text{HH} $ (right) axes, together with the signal expected for a radion of mass 1.5 TeV. |
png pdf |
Figure 4:
Slices of 2D distributions of observed events and the post-fit templates in the semi-resolved signal region, projected onto the $ m_{\text{J}_{1}} $ (left) and $ m_\text{HH} $ together with the signal expected for a radion of mass 1.5 TeV. |
png pdf |
Figure 4-a:
Slices of 2D distributions of observed events and the post-fit templates in the semi-resolved signal region, projected onto the $ m_{\text{J}_{1}} $ (left) and $ m_\text{HH} $ together with the signal expected for a radion of mass 1.5 TeV. |
png pdf |
Figure 4-b:
Slices of 2D distributions of observed events and the post-fit templates in the semi-resolved signal region, projected onto the $ m_{\text{J}_{1}} $ (left) and $ m_\text{HH} $ together with the signal expected for a radion of mass 1.5 TeV. |
png pdf |
Figure 5:
The observed (solid black line) and expected (dashed black line) upper limits at 95% CL on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to \mathrm{H}\mathrm{H}\to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) $ for a narrow spin-0 radion (left, corresponding to $ \Lambda_{\text{R}}= $ 3 TeV) and a narrow width spin-2 bulk graviton (right, corresponding to $ k/\overline{M}_\text{Pl} = $ 0.5) models. The green (yellow) bands represent one (two) standard deviations from the expected limit. The predicted theoretical cross sections for the narrow radion and bulk graviton are also shown. |
png pdf |
Figure 5-a:
The observed (solid black line) and expected (dashed black line) upper limits at 95% CL on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to \mathrm{H}\mathrm{H}\to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) $ for a narrow spin-0 radion (left, corresponding to $ \Lambda_{\text{R}}= $ 3 TeV) and a narrow width spin-2 bulk graviton (right, corresponding to $ k/\overline{M}_\text{Pl} = $ 0.5) models. The green (yellow) bands represent one (two) standard deviations from the expected limit. The predicted theoretical cross sections for the narrow radion and bulk graviton are also shown. |
png pdf |
Figure 5-b:
The observed (solid black line) and expected (dashed black line) upper limits at 95% CL on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to \mathrm{H}\mathrm{H}\to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) $ for a narrow spin-0 radion (left, corresponding to $ \Lambda_{\text{R}}= $ 3 TeV) and a narrow width spin-2 bulk graviton (right, corresponding to $ k/\overline{M}_\text{Pl} = $ 0.5) models. The green (yellow) bands represent one (two) standard deviations from the expected limit. The predicted theoretical cross sections for the narrow radion and bulk graviton are also shown. |
png pdf |
Figure 6:
The observed (solid black line) and expected (dashed black line) upper limits at 95% CL on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to \mathrm{H}\mathrm{H}\to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) $ for the 10%-width spin-0 radion (left) and the 10%-width spin-2 bulk graviton (right) models. The green (yellow) bands represent one (two) standard deviations from the expected limit. The predicted theoretical cross sections for the 10%-width radion and bulk graviton are also shown. |
png pdf |
Figure 6-a:
The observed (solid black line) and expected (dashed black line) upper limits at 95% CL on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to \mathrm{H}\mathrm{H}\to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) $ for the 10%-width spin-0 radion (left) and the 10%-width spin-2 bulk graviton (right) models. The green (yellow) bands represent one (two) standard deviations from the expected limit. The predicted theoretical cross sections for the 10%-width radion and bulk graviton are also shown. |
png pdf |
Figure 6-b:
The observed (solid black line) and expected (dashed black line) upper limits at 95% CL on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to \mathrm{H}\mathrm{H}\to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) $ for the 10%-width spin-0 radion (left) and the 10%-width spin-2 bulk graviton (right) models. The green (yellow) bands represent one (two) standard deviations from the expected limit. The predicted theoretical cross sections for the 10%-width radion and bulk graviton are also shown. |
| Tables | |
png pdf |
Table 1:
Event selection criteria for the fully-merged topology. |
png pdf |
Table 2:
Event selection criteria for the semi-resolved topology. |
png pdf |
Table 3:
Summary of the ranges within which the systematic uncertainties in the signal and background yields are varied in the combined fit of all ten regions for a radion resonance at 1500 GeV. |
| Summary |
| A search has been presented for the pair production of standard model Higgs bosons (HH) from the decay of a spin-0 radion or a spin-2 bulk graviton as predicted in warped extradimensional models, using data from proton-proton collisions at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb$^{-1}$. The search is restricted to the case where each Higgs boson decays to a bottom quark-antiquark pair. It is conducted in the region of phase space where at least one of the Higgs bosons has a large Lorentz boost, so that the $ \mathrm{H}\to\mathrm{b}\overline{\mathrm{b}} $ decay products are collimated to form a single H jet. The search combines events with one H jet and two b jets with events having two H jets, thus adding sensitivity compared with previous analyses [36,38]. The results are interpreted in terms of upper limits on the product of the production cross section for the respective resonance particles and the branching fraction to $ \mathrm{H}\mathrm{H} \to \mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}} $, at 95% confidence level. The upper limits range from 9.74 to 0.29 fb for a narrow radion and from 4.94 to 0.19 fb for a narrow bulk graviton, each having a mass of 1-3 TeV. Assuming a with of 10% for the radion and the graviton, the limits for the same masses are in the range 12.48-0.35 fb and 8.23-0.23 fb, respectively. As a result, the narrow-width graviton with $ m_{\mathrm{X}} $ below 1.2 TeV, and narrow and 10%-width radion with masses below 2.6 TeV, and 2.9 TeV, respectively, are excluded. |
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