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| CMS-PAS-HIG-21-011 | ||
| Search for a new resonance decaying to two scalars in the final state with two bottom quarks and two photons in proton-proton collisions at $\sqrt{s}=$ 13 TeV | ||
| CMS Collaboration | ||
| July 2022 | ||
| Abstract: A search for new resonances in the final state with two bottom quarks and two photons is presented, using CERN LHC proton-proton collision data collected by the CMS experiment at $\sqrt{s} = $ 13 TeV, and corresponding to an integrated luminosity of 138 fb$^{-1}$. The resonance X decays into either a pair of the standard model Higgs bosons HH, or an H and a new scalar $\mathrm{Y}$ having a mass $m_{\mathrm{Y}} < m_{\mathrm{X}} - m_{\mathrm{H}}$. A model-independent analysis is performed with a narrow-width approximation for X in the mass range 260 GeV-1 TeV (for the HH decay) and 300 GeV-1 TeV (for the HY decay), covering a mass range of 90 $ < m_{\mathrm{Y}} < $ 800 GeV. The upper limits at 95% confidence level on the product of the production cross section of spin-0 X and its decay branching fraction to HH are observed to be within 0.82-0.07 fb, while the corresponding expected limits are 0.74 - 0.08 fb, depending upon the considered mass range in $m_{\mathrm{X}}$. For the X decaying to HY, the observed limits lie in the range 0.90-0.04 fb whereas the expected limits are 0.79-0.05 fb, with the considered mass ranges in $m_{\mathrm{X}}$ and $m_{\mathrm{Y}}$. The largest deviation from background-only hypothesis with local (global) significance of 3.8 (2.8) standard deviations is observed for $m_{\mathrm{X}}= $ 650 GeV and $m_{\mathrm{Y}}= $ 90 GeV. The HH limits are compared with predictions in the warped extra dimensional model. The HY limits are interpreted with the next-to-minimal supersymmetric standard model and the two-real-scalar-singlet model. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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| Figures | |
png pdf |
Figure 1:
Feynman diagram showing gluon-gluon fusion production of a BSM resonance X decaying to a pair of scalars (HH or HY), which then decay to the ${\gamma \gamma \mathrm{b} {}\mathrm{\bar{b}}}$ final state. |
png pdf |
Figure 2:
Invariant mass distributions $ {m_{\gamma \gamma}} $ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 2-a:
Invariant mass distributions $ {m_{\gamma \gamma}} $ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 2-b:
Invariant mass distributions $ {m_{\gamma \gamma}} $ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 2-c:
Invariant mass distributions $ {m_{\gamma \gamma}} $ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 2-d:
Invariant mass distributions $ {m_{\gamma \gamma}} $ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 3:
Invariant mass distributions ${m_\text {jj}}$ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 3-a:
Invariant mass distributions ${m_\text {jj}}$ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 3-b:
Invariant mass distributions ${m_\text {jj}}$ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 3-c:
Invariant mass distributions ${m_\text {jj}}$ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 3-d:
Invariant mass distributions ${m_\text {jj}}$ with the selected data events (black points) for the signal dominated category (CAT 0). The upper left plot represents HH signal and rest of three represent HY signal with ${m_{\mathrm{Y}}} =$ 250, 500 and 700 GeV mass hypotheses, respectively. The solid red line shows the sum of the fitted signal and background events. The solid blue line shows the total background component by summing the resonant and nonresonant background contributions and the dashed black line shows the nonresonant background component. The green and yellow bands represent the 1 and 2 standard deviations which include the uncertainties in fit to the background component. The lower panel in each plot shows the residual signal yield after the background subtraction. |
png pdf |
Figure 4:
Expected and observed 95% CL upper limit on product of resonant production cross section and branching fraction for spin-0 (upper plot) and spin-2 (lower plot) ${{\mathrm{p}} {\mathrm{p}} \to \mathrm{X} \to \mathrm{H} \mathrm{H} \to {\gamma \gamma \mathrm{b} {}\mathrm{\bar{b}}}}$ signal hypotheses. The dashed and solid black lines represent expected and observed limits, respectively. The green and yellow bands represent the 1 and 2 standard deviations for the expected limit. The red lines show the theoretical predictions with different energy scales and couplings. |
png pdf |
Figure 4-a:
Expected and observed 95% CL upper limit on product of resonant production cross section and branching fraction for spin-0 (upper plot) and spin-2 (lower plot) ${{\mathrm{p}} {\mathrm{p}} \to \mathrm{X} \to \mathrm{H} \mathrm{H} \to {\gamma \gamma \mathrm{b} {}\mathrm{\bar{b}}}}$ signal hypotheses. The dashed and solid black lines represent expected and observed limits, respectively. The green and yellow bands represent the 1 and 2 standard deviations for the expected limit. The red lines show the theoretical predictions with different energy scales and couplings. |
png pdf |
Figure 4-b:
Expected and observed 95% CL upper limit on product of resonant production cross section and branching fraction for spin-0 (upper plot) and spin-2 (lower plot) ${{\mathrm{p}} {\mathrm{p}} \to \mathrm{X} \to \mathrm{H} \mathrm{H} \to {\gamma \gamma \mathrm{b} {}\mathrm{\bar{b}}}}$ signal hypotheses. The dashed and solid black lines represent expected and observed limits, respectively. The green and yellow bands represent the 1 and 2 standard deviations for the expected limit. The red lines show the theoretical predictions with different energy scales and couplings. |
png pdf |
Figure 5:
The upper plot shows the expected and observed 95% CL exclusion limit on production cross section for ${{\mathrm{p}} {\mathrm{p}} \to \mathrm{X} \to \mathrm{H} \mathrm{Y} \to {\gamma \gamma \mathrm{b} {}\mathrm{\bar{b}}}}$ signal hypothesis. The dashed and solid black lines represent expected and observed limits, respectively. The green and yellow bands represent the 1 and 2 standard deviations for the expected limit. Limits are scaled with the order of 10 depending upon ${m_{\mathrm{X}}}$. |
png pdf |
Figure 6:
Interpretations of the HY searches for both expected (left) and observed (right) limits at 95% CL using NMSSM and TRSM models where the red and black lines indicate the excluded mass regions for both, respectively. |
png pdf |
Figure 6-a:
Interpretations of the HY searches for both expected (left) and observed (right) limits at 95% CL using NMSSM and TRSM models where the red and black lines indicate the excluded mass regions for both, respectively. |
png pdf |
Figure 6-b:
Interpretations of the HY searches for both expected (left) and observed (right) limits at 95% CL using NMSSM and TRSM models where the red and black lines indicate the excluded mass regions for both, respectively. |
| Tables | |
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Table 1:
Event preselection criteria. |
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Table 2:
Event classification. |
| Summary |
| A search for new resonances X decaying either to a pair of Higgs bosons HH, or to a Higgs boson and a new scalar Y, is presented. The search uses data from proton-proton collisions collected by the CMS experiment at LHC in 2016-2018 at a center-of-mass energy of 13 TeV, and corresponding to 138 fb$^{-1}$ of integrated luminosity. The study is motivated from theories related to the warped extra dimension model, the next-to-minimal supersymmetric standard model and the two-real-scalar-singlet model assuming narrow width approximation. For a X decaying to HH, a mass range of 260 GeV-1 TeV is covered, while a X decaying to HY is searched for range 300 GeV-1 TeV in ${m_{\mathrm{X}}}$, considering a mass range 90-800 GeV in ${m_{\mathrm{Y}}}$. The data were found to be compatible with the background-only hypothesis. Results are presented as the upper limits at 95% confidence level on the product of the production cross section of X and its branching fraction to the ${\gamma\gamma\mathrm{b\bar{b}}}$ final state, through either HH or HY. Depending upon the mass range in ${m_{\mathrm{X}}}$, the observed limits for a spin-0 resonance X, decaying to HH, ranges from 0.82-0.07 fb}, while the expected limits are 0.74-0.08 fb. Bulk radions decaying to HH are excluded for masses up to 600 GeV for $\Lambda_{R} = $ 6 TeV, while the mass limit on a bulk KK graviton extends to 850 GeV assuming a coupling factor $\kappa/\overline{M_{pl}}=$ 0.5. For the resonance X decaying to HY, the observed limits are 0.90-0.04 fb, while the expected limits lie in the range 0.79-0.05 fb, depending upon the mass ranges in ${m_{\mathrm{X}}}$ and ${m_{\mathrm{Y}}}$. The largest deviation from background-only hypothesis with local (global) significance of 3.8 (2.8) standard deviations is also observed for ${m_{\mathrm{X}}} = $ 650 GeV and ${m_{\mathrm{Y}}} = $ 90 GeV. The results are interpreted for the NMSSM and the TRSM theories. |
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