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| CMS-HIG-23-005 ; CERN-EP-2024-252 | ||
| Search for the Higgs boson decays to a $ \rho^{0} $, $ \phi $, or $ \mathrm{K}^{*0} $ meson and a photon in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 23 October 2024 | ||
| Submitted to Phys. Lett. B | ||
| Abstract: Three rare decay processes of the Higgs boson to a $ \rho(770) $, $ \phi(1020) $, or $ \mathrm{K}^{*}(892)^{0} $ meson and a photon are searched for using $ \sqrt{s}= $ 13 TeV proton-proton collision data collected by the CMS experiment at the LHC. Events are selected assuming the mesons decay into a pair of charged pions, a pair of charged kaons, or a charged kaon and pion, respectively. Depending on the Higgs boson production mode, different triggering and reconstruction techniques are adopted. The analyzed data sets correspond to integrated luminosities up to 138 fb$ ^{-1} $, depending on the reconstructed final state. After combining various data sets and categories, no significant excess above the background expectations is observed. Upper limits at 95% confidence level on the Higgs boson branching fractions into $ \rho(770)\gamma $, $ \phi(1020)\gamma $, and $ \mathrm{K}^{*}(892)^{0}\gamma $ are determined to be 3.7 $ \times $ 10$^{-4} $, 3.0 $ \times $ 10$^{-4} $, and 3.0 $ \times $ 10$^{-4} $, respectively. In case of the $ \rho(770)\gamma $ and $ \phi(1020)\gamma $ channels, these are the most stringent experimental limits to date. | ||
| Links: e-print arXiv:2410.18289 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
Feynman diagrams showing the different Higgs boson decay mechanisms into a photon and a light meson (upper: $ \phi $ meson; lower: $ \mathrm{K}^{*0} $ meson). The hatched circle in the upper 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:
Track pair invariant mass distributions in selected data events, for the $ \mathrm{g}\mathrm{g}\mathrm{H} $ category of the analysis, for the $ \rho^{0}\gamma $ (upper left), $ \phi\gamma $ (upper right), and $ \mathrm{K}^{*0}\gamma $ (lower) decays. The vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 2-a:
Track pair invariant mass distributions in selected data events, for the $ \mathrm{g}\mathrm{g}\mathrm{H} $ category of the analysis, for the $ \rho^{0}\gamma $ (upper left), $ \phi\gamma $ (upper right), and $ \mathrm{K}^{*0}\gamma $ (lower) decays. The vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 2-b:
Track pair invariant mass distributions in selected data events, for the $ \mathrm{g}\mathrm{g}\mathrm{H} $ category of the analysis, for the $ \rho^{0}\gamma $ (upper left), $ \phi\gamma $ (upper right), and $ \mathrm{K}^{*0}\gamma $ (lower) decays. The vertical dashed lines represent the signal mass region borders. |
png pdf |
Figure 2-c:
Track pair invariant mass distributions in selected data events, for the $ \mathrm{g}\mathrm{g}\mathrm{H} $ category of the analysis, for the $ \rho^{0}\gamma $ (upper left), $ \phi\gamma $ (upper right), and $ \mathrm{K}^{*0}\gamma $ (lower) decays. The 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 $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 3-a:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 3-b:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 3-c:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 3-d:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 3-e:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 3-f:
Post-fit $ m_{\mathrm{M}\gamma} $ distributions in data and the background model for $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (upper left) and VBF high-$ p_{\mathrm{T}}^\gamma $ cat0 (upper right) of the $ \mathrm{H}\to\rho^{0}\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (middle left) and the VH category (middle right) of the $ \mathrm{H}\to\phi\gamma $ search, $ \mathrm{g}\mathrm{g}\mathrm{H} $ cat0 (lower left) and the VBF low-$ p_{\mathrm{T}}^\gamma $ cat0 (lower right) of the $ \mathrm{H}\to\mathrm{K}^{*0}\gamma $ search. The signal simulation is shown normalized at a branching fraction corresponding to the expected UL. Signal and background fit components, as well as 1 and 2 standard deviation(s) uncertainty bands are also shown. |
png pdf |
Figure 4:
Expected and observed UL 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}^{*0}\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 68% and 95% confidence intervals on the expected upper limits. |
png pdf |
Figure 4-a:
Expected and observed UL 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}^{*0}\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 68% and 95% confidence intervals on the expected upper limits. |
png pdf |
Figure 4-b:
Expected and observed UL 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}^{*0}\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 68% and 95% confidence intervals on the expected upper limits. |
png pdf |
Figure 4-c:
Expected and observed UL 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}^{*0}\gamma) $ (lower) split by analysis categories and combined. Green and yellow bands correspond to 68% and 95% confidence intervals on the expected upper limits. |
| Tables | |
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Table 1:
Mass requirements imposed on the ditrack system for signal and sideband regions. |
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Table 2:
Summary of the event selection criteria, photon identification efficiency and integrated luminosity ($ \mathcal{L} $) used in the analysis. |
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Table 3:
Exclusion limits at 95% CL on the branching fractions of the Higgs boson decays. Observed and median expected limits with the upper and lower bounds in the expected 68% CL intervals are also reported. |
| Summary |
| A search was presented for Higgs boson decays into a photon and a $ \rho(770) $, $ \phi(1020) $, or $ \mathrm{K}^{*}(892)^{0} $ meson, using pp collision data at $ \sqrt{s}= $ 13 TeV collected by the CMS experiment at the LHC. Events are selected assuming the mesons decay into a pair of charged pions, a pair of charged kaons, or a charged kaon and pion, respectively. Depending on the Higgs boson production mode, different signal triggering and reconstruction techniques are adopted. The analyzed data sets correspond to an integrated luminosity varying between 39.5 and 138 fb$ ^{-1} $, depending on the targeted final state. After combining various data sets and 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(770)\gamma $, $ \phi(1020)\gamma $, and $ \mathrm{K}^{*}(892)^{0}\gamma $ are determined to be 3.7 $ \times $ 10$^{-4} $, 3.0 $ \times $ 10$^{-4} $, and 3.0 $ \times $ 10$^{-4} $, respectively. Limits for the $ \rho(770)\gamma $ and $ \phi(1020)\gamma $ channels constitute the most stringent experimental limits to date. |
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