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| CMS-PAS-HIG-23-005 | ||
| Search for rare decays of the Higgs boson into a photon and a $ \rho $, $ \phi $ or $ \mathrm{K}^{*0} $ meson | ||
| CMS Collaboration | ||
| 4 April 2024 | ||
| Abstract: Higgs boson decays into a photon and a $ \rho^0 $(770), $ \phi $, or $ \mathrm{K}^{*0} $(892) meson are searched for using proton-proton collision data collected by the CMS experiment at the LHC at $ \sqrt{s}= $ 13 TeV. Events are selected in which the mesons decay into pairs of charged pions, pairs of charged kaons, and charged kaon-pion pairs respectively. Depending on the Higgs boson production mode, different triggering and reconstruction techniques are adopted. The analysed data sets correspond to an integrated luminosity varying between 39.5 and 138 fb$ ^{-1} $, depending on the targeted final state. By combining these analysis categories, no significant excess above the background expectations is observed. Upper limits at the 95% confidence level on the Higgs boson branching fractions into $ \rho^0\gamma $, $ \phi\gamma $, and $ \mathrm{K}^{*0}\gamma $ are determined to be 3.74 $ \times$ 10$^{-4} $, 2.97 $ \times$ 10$^{-4} $, and 1.71 $ \times$ 10$^{-4} $, respectively. These results constitute the most stringent experimental limits to date. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Feynman diagrams showing the different Higgs boson decay mechanisms into a photon and a light meson (upper: $ \phi $ meson; lower: $ \mathrm{K^{\ast}(892)}^0 $ meson). The crossed circle in the top right diagram denotes the off-shell $ \mathrm{H} \to \gamma\gamma^* $ amplitude, which in the SM arises first at one-loop order. |
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Figure 2:
Di-track mass distribution in selected events in data, for the ggH category of the analysis, $ \rho^0\gamma $ (upper left), $ \phi\gamma $ (upper right) and $ \mathrm{K^{\ast}(892)}^0\gamma $ (lower) decays. Vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 2-a:
Di-track mass distribution in selected events in data, for the ggH category of the analysis, $ \rho^0\gamma $ (upper left), $ \phi\gamma $ (upper right) and $ \mathrm{K^{\ast}(892)}^0\gamma $ (lower) decays. Vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 2-b:
Di-track mass distribution in selected events in data, for the ggH category of the analysis, $ \rho^0\gamma $ (upper left), $ \phi\gamma $ (upper right) and $ \mathrm{K^{\ast}(892)}^0\gamma $ (lower) decays. Vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 2-c:
Di-track mass distribution in selected events in data, for the ggH category of the analysis, $ \rho^0\gamma $ (upper left), $ \phi\gamma $ (upper right) and $ \mathrm{K^{\ast}(892)}^0\gamma $ (lower) decays. Vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 3:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 3-a:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 3-b:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 3-c:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 3-d:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 3-e:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 3-f:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for ggH cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $/cat0 (upper right) of the $ \mathrm{H}\to\rho^0\gamma $ search, ggH cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, ggH cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $/cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected upper limit. Signal and background fit components, as well as 1- and 2-$ \sigma $ fit uncertainty bands are also shown. |
png pdf |
Figure 4:
Expected and observed upper limits on $ \mathcal{B}(\mathrm{H}\to\rho^0\gamma) $ (upper left), $ \mathcal{B}(\mathrm{H}\to\phi\gamma) $ (upper right), and $ \mathcal{B}(\mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 1 and 2$ \sigma $ confidence intervals in the expected upper limits. |
png pdf |
Figure 4-a:
Expected and observed upper limits on $ \mathcal{B}(\mathrm{H}\to\rho^0\gamma) $ (upper left), $ \mathcal{B}(\mathrm{H}\to\phi\gamma) $ (upper right), and $ \mathcal{B}(\mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 1 and 2$ \sigma $ confidence intervals in the expected upper limits. |
png pdf |
Figure 4-b:
Expected and observed upper limits on $ \mathcal{B}(\mathrm{H}\to\rho^0\gamma) $ (upper left), $ \mathcal{B}(\mathrm{H}\to\phi\gamma) $ (upper right), and $ \mathcal{B}(\mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 1 and 2$ \sigma $ confidence intervals in the expected upper limits. |
png pdf |
Figure 4-c:
Expected and observed upper limits on $ \mathcal{B}(\mathrm{H}\to\rho^0\gamma) $ (upper left), $ \mathcal{B}(\mathrm{H}\to\phi\gamma) $ (upper right), and $ \mathcal{B}(\mathrm{H}\to\mathrm{K^{\ast}(892)}^0\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 1 and 2$ \sigma $ confidence intervals in the expected upper limits. |
| Tables | |
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Table 1:
Invariant mass of the di-track system for signal and sideband regions. |
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Table 2:
Summary of selections used in the analysis. |
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Table 3:
Exclusion limits at 95% CL on the branching fractions of the H boson decays. Observed and median expected limits with the upper and lower bounds in the expected 68% CL intervals are reported. |
| Summary |
| A search was presented for Higgs boson decays into a photon and a $ \rho^0 $(770), $ \phi $(1020), or $ \mathrm{K^{\ast}}^0 $(892) meson, using proton-proton collision data collected by the CMS experiment at the LHC at $ \sqrt{s}= $ 13 TeV. Events are selected in which the mesons decay into pairs of charged pions, pairs of charged kaons, and charged kaon-pion pairs respectively. Depending on the Higgs boson production mode, different signal triggering and reconstruction techniques are adopted. The analysed data sets correspond to an integrated luminosity varying between 39.5 and 138 fb$ ^{-1} $, depending on the targeted final state. By combining all of them, no significant excess above the background expectations is observed. Upper limits at the 95% confidence level on the Higgs boson branching fractions into $ \rho^0\gamma $, $ \phi\gamma $, and $ \mathrm{K^{\ast}(892)}^0\gamma $ are determined to be 3.74 $ \times 10^{-4} $, 2.97 $ \times 10^{-4} $, and 1.71 $ \times 10^{-4} $, respectively. These results constitute the most stringent experimental limits to date on the $ \rho^0\gamma $ and $ \phi\gamma $ decay channels. |
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