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| CMS-PAS-HIG-16-032 | ||
| Search for $\mathrm{ H( {b\bar{b}} )H( {\gamma\gamma} )}$ decays at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| August 2016 | ||
| Abstract: The search for the production of a pair of Higgs bosons, in the final states containing two photons and two bottom quarks, is presented. Both resonant and nonresonant production mechanisms of the Higgs bosons are investigated. The analyzed data correspond to an integrated luminosity of 2.70 fb$^{-1}$ of pp collisions at $ \sqrt{s} = $ 13 TeV collected with the CMS detector in 2015. Upper limits on the production cross section of spin-0 and spin-2 particles are set at 95% confidence level. In addition, upper limits on nonresonant Higgs pair production are also set and compared to the SM Higgs pair production cross section via gluon fusion. The observed data is in agreement with standard model predictions. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Feynman diagrams that contribute to Higgs boson pair production by gluon fusion at leading order. On the left, via a heavy quark loop (with dominant top quark contribution). On the right, via the Higgs self coupling. |
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Figure 2-a:
Signal $A\times \epsilon $ for (a) spin-0 radion and (b) spin-2 graviton signals, after each step of selection. |
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Figure 2-b:
Signal $A\times \epsilon $ for (a) spin-0 radion and (b) spin-2 graviton signals, after each step of selection. |
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Figure 3-a:
Distributions of (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ for 2.7 fb$^{-1}$ of data (points), expected SM single Higgs signal and background (shaded histograms), and resonant and nonresonant signals (lines). The 300 GeV Graviton, 600 GeV Radion and the SM nonresonant HH signal shapes are displayed, normalized assuming $\sigma ( \mathrm{ pp \to X \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = \sigma ( \mathrm{ pp \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = $ 100 fb. Events are required to pass the photon and jet selection described in Sec. 4 and to have at least one jet passing loose b-tagging requirements. |
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Figure 3-b:
Distributions of (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ for 2.7 fb$^{-1}$ of data (points), expected SM single Higgs signal and background (shaded histograms), and resonant and nonresonant signals (lines). The 300 GeV Graviton, 600 GeV Radion and the SM nonresonant HH signal shapes are displayed, normalized assuming $\sigma ( \mathrm{ pp \to X \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = \sigma ( \mathrm{ pp \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = $ 100 fb. Events are required to pass the photon and jet selection described in Sec. 4 and to have at least one jet passing loose b-tagging requirements. |
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Figure 4:
Pictorial description of the b-tag categorization scheme, in which the axes represent the b-tag score of the leading jet (y-axis) and of the subleading jet (x-axis). The low mass analysis categorization is shown on the left, while the nonresonant analysis categorization is shown on the right. HPC is the high-purity category, while MPC is the medium-purity category, and JCR is the jet control region. |
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Figure 5:
Different 4-body mass reconstruction methods for different radion signal points: $ {\tilde{M}_{\mathrm {X}}} $ (dotted line) and $ {M(\mathrm{jj}\gamma \gamma )}$ (full line). Mass points are normalized independently, such that $ {M(\mathrm{jj}\gamma \gamma )}$ peak heights are set to unit. The different hypothesis mass samples are simulated assuming 1 GeV widths. |
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Figure 6-a:
Distributions of (a) $ {M(\mathrm{jj}\gamma \gamma )}$ and (b) $ {\tilde{M}_{\mathrm {X}}} $ for 2.7 fb$^{-1}$ of data (points), expected SM single Higgs signal and background (shaded histograms), and resonant and nonresonant signals (lines). The 300 GeV Graviton, 600 GeV Radion and the SM nonresonant HH signal shapes are displayed, normalized assuming $\sigma (\mathrm{ pp\to X \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = \sigma ( \mathrm{ pp \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = $ 100 fb. Events are required to pass the photon and jet selection described in Sec. 4 and to have at least one jet passing loose b-tagging requirements. |
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Figure 6-b:
Distributions of (a) $ {M(\mathrm{jj}\gamma \gamma )}$ and (b) $ {\tilde{M}_{\mathrm {X}}} $ for 2.7 fb$^{-1}$ of data (points), expected SM single Higgs signal and background (shaded histograms), and resonant and nonresonant signals (lines). The 300 GeV Graviton, 600 GeV Radion and the SM nonresonant HH signal shapes are displayed, normalized assuming $\sigma (\mathrm{ pp\to X \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = \sigma ( \mathrm{ pp \to HH \to \mathrm{ b \bar{b} }\gamma \gamma } ) = $ 100 fb. Events are required to pass the photon and jet selection described in Sec. 4 and to have at least one jet passing loose b-tagging requirements. |
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Figure 7:
$ {M(\gamma \gamma )} $:$ {\tilde{M}_{\mathrm {X}}} $ distribution for the dominant background, modeled with diphoton+jets MC, after the full selection. The red and gray lines represent the mass window regions for resonances with masses of 250 GeV and 300 GeV, respectively. |
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Figure 8-a:
Signal fits for the resonant 320 GeV Radion (spin-0) sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 8-b:
Signal fits for the resonant 320 GeV Radion (spin-0) sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 8-c:
Signal fits for the resonant 320 GeV Radion (spin-0) sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 8-d:
Signal fits for the resonant 320 GeV Radion (spin-0) sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 9-a:
Signal fits for the SM HH nonresonant sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 9-b:
Signal fits for the SM HH nonresonant sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 9-c:
Signal fits for the SM HH nonresonant sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 9-d:
Signal fits for the SM HH nonresonant sample after selection for the high (a) and medium (b) purity b-tag categories. Upper plots show fits to $ {M(\gamma \gamma )} $, while lower plots show fits to $ {M(\mathrm{jj})} $. |
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Figure 10-a:
Background-only fits for the resonant search with the 320 GeV mass window selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , in the high purity b-tag category. |
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Figure 10-b:
Background-only fits for the resonant search with the 320 GeV mass window selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , in the high purity b-tag category. |
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Figure 11-a:
Background-only fits for the resonant search with the 320 GeV mass window selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , in the medium purity b-tag category. |
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Figure 11-b:
Background-only fits for the resonant search with the 320 GeV mass window selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , in the medium purity b-tag category. |
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Figure 12-a:
Background fits for the nonresonant analysis, after selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , high purity b-tag category. |
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Figure 12-b:
Background fits for the nonresonant analysis, after selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , high purity b-tag category. |
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Figure 13-a:
Background fits for the nonresonant analysis, after selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , medium purity b-tag category. |
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Figure 13-b:
Background fits for the nonresonant analysis, after selection, for (a) $ {M(\gamma \gamma )} $ and (b) $ {M(\mathrm{jj})} $ , medium purity b-tag category. |
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Figure 14-a:
Expected and observed upper limits on the production of $\mathrm{ pp \to X\to { {\mathrm {H}} {\mathrm {H}} } \to {\mathrm{ b \bar{b} }\gamma \gamma } } $ for the resonant analysis, assuming (a) spin-0 and (b) spin-2 for the resonance. Cross sections predicted by the RS WED model are shown (dashed red lines). The SM branching for $ { {\mathrm {H}} {\mathrm {H}} } \to {\mathrm{ b \bar{b} }\gamma \gamma } $ is assumed. |
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Figure 14-b:
Expected and observed upper limits on the production of $\mathrm{ pp \to X\to { {\mathrm {H}} {\mathrm {H}} } \to {\mathrm{ b \bar{b} }\gamma \gamma } } $ for the resonant analysis, assuming (a) spin-0 and (b) spin-2 for the resonance. Cross sections predicted by the RS WED model are shown (dashed red lines). The SM branching for $ { {\mathrm {H}} {\mathrm {H}} } \to {\mathrm{ b \bar{b} }\gamma \gamma } $ is assumed. |
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Figure 15:
Expected and observed upper limits on the nonresonant production of the SM process $\mathrm{ pp } \to { {\mathrm {H}} {\mathrm {H}} } \to {\mathrm{ b \bar{b} }\gamma \gamma } $, separated in analysis categories: high purity, medium purity and the final combined result. |
| Tables | |
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Table 1:
Summary of the search analysis methods used in this search. |
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Table 2:
Summary of systematic uncertainties. The uncertainty in the b-tagging efficiency is anticorrelated between the b tag categories. |
| Summary |
| A search is performed by the CMS collaboration for resonant and nonresonant production of two Higgs bosons in the decay channel ${\mathrm{ H }\mathrm{ H }} \to \mathrm{ b \bar{b} } \gamma\gamma $, based on an integrated luminosity of 2.70 fb$^{-1}$ of $pp$ collisions collected at $ \sqrt{s} = $ 13 TeV in 2015. Resonances are sought in the mass range between 250 and 900 GeV. Expected and observed upper limits at a 95% CL are measured on the cross sections for the production of new particles decaying to ${\mathrm{ H }\mathrm{ H }} \to \mathrm{ b \bar{b} } \gamma \gamma $. The limits are compared to BSM predictions, based on the assumption of the existence of a warped extra dimension. No statistically significant deviations from the null hypothesis are found. The observed limits exclude radion (spin-0) mass points below 750 GeV, except in the vicinity of $M_{X} = $ 650 GeV, assuming $\Lambda_{R} = $ 1 TeV. For nonresonant production with SM-like kinematics, a 95% CL upper limit is set on $\sigma( \mathrm{ pp \to HH \to {b\bar{b} } \gamma \gamma } )$ at 7.90 fb. |
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