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| CMS-PAS-B2G-24-019 | ||
| Search for a heavy resonance decaying into a Higgs boson and a new scalar boson using the $ \gamma\gamma\mathrm{b}\bar{\mathrm{b}} $ final state in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 2026-07-28 | ||
| Abstract: A search is presented for a heavy resonance $ \mathrm{X} $ decaying into a Higgs boson (H) and a new scalar particle ($ \mathrm{Y} $) through the process $ \mathrm{X} \to \mathrm{H}\mathrm{Y} $. The Higgs boson is reconstructed in the diphoton decay channel, while the $ \mathrm{Y} $ particle is reconstructed in its decay to a bottom quark-antiquark pair, resulting in the distinctive $ \gamma\gamma\mathrm{b}\bar{\mathrm{b}} $ final state. The analysis uses proton-proton collision data collected with the CMS detector at a centre-of-mass energy of 13 TeV during 2016--2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The search explores the mass ranges 1.0 $ \leq m_{\mathrm{X}} \leq $ 4.0 TeV and 0.06 $ \leq m_{\mathrm{Y}} \leq $ 2.8 TeV. No statistically significant excess above the background expectation is observed. Model-independent upper limits at 95% confidence level are set on the production cross section times the branching fraction for $ \mathrm{X} \to \mathrm{H}\mathrm{Y} \to \gamma\gamma\mathrm{b}\bar{\mathrm{b}} $, ranging from 0.26 $ \mathrm{fb} $ at $ m_{\mathrm{X}} = $ 1 TeV to 0.046 $ \mathrm{fb} $ at $ m_{\mathrm{X}} = $ 4 TeV. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Feynman diagram for the production of a resonance $ \mathrm{X} $ via gluon-gluon fusion and its decay $ \mathrm{X}\to\mathrm{H}\mathrm{Y} $, with $ \mathrm{H}\to\gamma\gamma $ and $ \mathrm{Y}\to\mathrm{b}\bar{\mathrm{b}} $. |
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Figure 2:
Distributions of $ \Delta R(\gamma\gamma) $ (left) and $ p_{\mathrm{T}}^{\gamma_1}/m_{\gamma\gamma} $ (right), where $ \gamma_1 $ is the leading photon. The points show data, and the stacked histograms show the simulated prompt diphoton and data-driven misidentified-photon backgrounds. The vertical bars and hatched bands show the statistical uncertainties in the data and total background, respectively. The red line shows the signal for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV, normalized to the total background yield. The lower panels show the ratio of data to the total background. |
png pdf |
Figure 2-a:
Distributions of $ \Delta R(\gamma\gamma) $ (left) and $ p_{\mathrm{T}}^{\gamma_1}/m_{\gamma\gamma} $ (right), where $ \gamma_1 $ is the leading photon. The points show data, and the stacked histograms show the simulated prompt diphoton and data-driven misidentified-photon backgrounds. The vertical bars and hatched bands show the statistical uncertainties in the data and total background, respectively. The red line shows the signal for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV, normalized to the total background yield. The lower panels show the ratio of data to the total background. |
png pdf |
Figure 2-b:
Distributions of $ \Delta R(\gamma\gamma) $ (left) and $ p_{\mathrm{T}}^{\gamma_1}/m_{\gamma\gamma} $ (right), where $ \gamma_1 $ is the leading photon. The points show data, and the stacked histograms show the simulated prompt diphoton and data-driven misidentified-photon backgrounds. The vertical bars and hatched bands show the statistical uncertainties in the data and total background, respectively. The red line shows the signal for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV, normalized to the total background yield. The lower panels show the ratio of data to the total background. |
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Figure 3:
Distributions of the PNN output before (left) and after (right) the background-flattening transformation. The points show data, and the stacked histograms show the simulated prompt diphoton and data-driven misidentified-photon backgrounds. The vertical bars and hatched bands show the statistical uncertainties in the data and total background, respectively. The red line shows the signal for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV, normalized to the total background yield. The lower panels show the ratio of data to the total background. The different band widths reflect the event populations in the transformed bins. |
png pdf |
Figure 3-a:
Distributions of the PNN output before (left) and after (right) the background-flattening transformation. The points show data, and the stacked histograms show the simulated prompt diphoton and data-driven misidentified-photon backgrounds. The vertical bars and hatched bands show the statistical uncertainties in the data and total background, respectively. The red line shows the signal for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV, normalized to the total background yield. The lower panels show the ratio of data to the total background. The different band widths reflect the event populations in the transformed bins. |
png pdf |
Figure 3-b:
Distributions of the PNN output before (left) and after (right) the background-flattening transformation. The points show data, and the stacked histograms show the simulated prompt diphoton and data-driven misidentified-photon backgrounds. The vertical bars and hatched bands show the statistical uncertainties in the data and total background, respectively. The red line shows the signal for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV, normalized to the total background yield. The lower panels show the ratio of data to the total background. The different band widths reflect the event populations in the transformed bins. |
png pdf |
Figure 4:
Simulated $ m_{\gamma\gamma} $ distribution for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 170 GeV in resolved category 2. The points show signal events, and the blue curve shows the parametric fit. The other curves show the 2016 pre-VFP, 2016 post-VFP, 2017, and 2018 components. The vertical bars show statistical uncertainties. The effective standard deviation $ \sigma_{\mathrm{eff}} $ is half the width of the narrowest interval containing 68.3% of the distribution. |
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Figure 5:
Diphoton invariant mass distributions in the five event categories for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV. The points show data, with vertical bars indicating statistical uncertainties. The green and yellow bands show the one and two standard deviation uncertainties in the fitted background, respectively. The dashed blue and black curves show the single Higgs boson plus nonresonant background (B+H) and the nonresonant background (B), respectively. The lower panels show the data after subtraction of the B component. |
png pdf |
Figure 5-a:
Diphoton invariant mass distributions in the five event categories for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV. The points show data, with vertical bars indicating statistical uncertainties. The green and yellow bands show the one and two standard deviation uncertainties in the fitted background, respectively. The dashed blue and black curves show the single Higgs boson plus nonresonant background (B+H) and the nonresonant background (B), respectively. The lower panels show the data after subtraction of the B component. |
png pdf |
Figure 5-b:
Diphoton invariant mass distributions in the five event categories for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV. The points show data, with vertical bars indicating statistical uncertainties. The green and yellow bands show the one and two standard deviation uncertainties in the fitted background, respectively. The dashed blue and black curves show the single Higgs boson plus nonresonant background (B+H) and the nonresonant background (B), respectively. The lower panels show the data after subtraction of the B component. |
png pdf |
Figure 5-c:
Diphoton invariant mass distributions in the five event categories for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV. The points show data, with vertical bars indicating statistical uncertainties. The green and yellow bands show the one and two standard deviation uncertainties in the fitted background, respectively. The dashed blue and black curves show the single Higgs boson plus nonresonant background (B+H) and the nonresonant background (B), respectively. The lower panels show the data after subtraction of the B component. |
png pdf |
Figure 5-d:
Diphoton invariant mass distributions in the five event categories for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV. The points show data, with vertical bars indicating statistical uncertainties. The green and yellow bands show the one and two standard deviation uncertainties in the fitted background, respectively. The dashed blue and black curves show the single Higgs boson plus nonresonant background (B+H) and the nonresonant background (B), respectively. The lower panels show the data after subtraction of the B component. |
png pdf |
Figure 5-e:
Diphoton invariant mass distributions in the five event categories for $ m_{\mathrm{X}}= $ 1 TeV and $ m_{\mathrm{Y}}= $ 100 GeV. The points show data, with vertical bars indicating statistical uncertainties. The green and yellow bands show the one and two standard deviation uncertainties in the fitted background, respectively. The dashed blue and black curves show the single Higgs boson plus nonresonant background (B+H) and the nonresonant background (B), respectively. The lower panels show the data after subtraction of the B component. |
png pdf |
Figure 6:
Observed (solid black) and expected (dashed black) 95% CL upper limits on the product of the $ \mathrm{X} $ production cross section and the $ \mathrm{X}\to\mathrm{H}\mathrm{Y}\to\gamma\gamma\mathrm{b}\bar{\mathrm{b}} $ branching fractions, as a function of $ m_{\mathrm{Y}} $. Results are shown for 1.0 $ \leq m_{\mathrm{X}} \leq $ 4.0 TeV and scaled by the factors indicated. The green and yellow bands show the 68 and 95% expected intervals, respectively. |
png pdf |
Figure 7:
Observed and expected 95% CL upper limits on $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{X}) \mathcal{B}(\mathrm{X}\to\mathrm{H}\mathrm{Y}) \mathcal{B}(\mathrm{Y}\to\mathrm{b}\bar{\mathrm{b}}) $ as functions of $ m_{\mathrm{Y}} $ for the indicated $ m_{\mathrm{X}} $ hypotheses. SM branching fractions are assumed for the Higgs boson decays. Results are shown for the individual $ \mathrm{H}(\gamma\gamma)\mathrm{Y}(\mathrm{b}\bar{\mathrm{b}}) $, $ \mathrm{H}(\mathrm{b}\bar{\mathrm{b}})\mathrm{Y}(\mathrm{b}\bar{\mathrm{b}}) $, and $ \mathrm{H}(\tau\tau)\mathrm{Y}(\mathrm{b}\bar{\mathrm{b}}) $ channels and their combination. Observed and expected limits are indicated by solid and dashed lines, respectively. The curves are scaled by the factors shown; arrows identify the corresponding $ m_{\mathrm{X}} $ values. |
| Tables | |
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Table 1:
The selection requirements for photon candidates. |
| Summary |
| The first search for the production of a new scalar resonance $ \mathrm{X} $ in the mass range 1 $ \leq m_{\mathrm{X}}\leq $ 4 TeV decaying into a Higgs boson (H) and another new scalar particle $ \mathrm{Y} $ in the photon-pair and bottom-quark-pair ($ \gamma\gamma\mathrm{b}\bar{\mathrm{b}} $) final state is presented. The search is based on proton-proton collisions at the LHC collected with the CMS detector during 2016--2018 at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The analysis is motivated by theoretical extensions of the standard model (SM), such as the next-to-minimal supersymmetric SM, which predict enhanced production rates for such processes. \beginsloppypar The analysis probes 0.06 $ \leq m_{\mathrm{Y}}\leq $ 2.8 TeV. No significant deviation from the background expectation is observed. The resulting 95% confidence level upper limits on the product of the production cross section and branching fraction for $ \mathrm{X}\to\mathrm{H}\mathrm{Y}\to\gamma\gamma\mathrm{b}\bar{\mathrm{b}} $ range from 0.26 fb for $ m_{\mathrm{X}}= $ 1 TeV to 0.046 fb for $ m_{\mathrm{X}}= $ 4 TeV. These results provide an important input to combinations with other $ \mathrm{H}\mathrm{Y} $ final states, improving the expected sensitivity in the high-mass region and extending the overall coverage of resonant scalar-pair searches. \endsloppypar |
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