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| CMS-PAS-HIG-18-011 | ||
| Search for an exotic decay of the Higgs boson to a pair of light pseudoscalars with two muons and two b jets in the final state at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| November 2018 | ||
| Abstract: A search for exotic decays of the Higgs boson to a pair of light pseudoscalar particles $\mathrm{a1}$ is performed under the hypothesis that one of the pseudoscalars decays to a pair of opposite sign muons and the other decays to a $\mathrm{b\bar{b}}$ pair. Such signatures are predicted in a number of extensions of the standard model (SM), including next-to-minimal supersymmetry and two-Higgs-doublet models with an additional scalar singlet. A data sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$ recorded with the CMS detector in 2016 is studied. No statistically significant excess is observed with respect to the SM backgrounds in the search region for pseudoscalar masses from 20 GeV to half of the Higgs boson mass. Upper limits at 95% confidence level are set on the production cross section times branching ratio, $\sigma_{\mathrm{h}}\times{\mathcal B}(\mathrm{h}\to \mathrm{a1}\mathrm{a1}\to\mu^+\mu^{-}\mathrm{b\bar{b}})$, ranging from 5 to 36 fb, depending on the pseudoscalar mass. Corresponding limits on the branching ratio, assuming the SM prediction for $\sigma_{\mathrm{h}}$, are (1-6)$\times 10^{-4}$. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PLB 795 (2019) 398. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
The distribution of $ {\chi _{{\mathrm {b}} {\mathrm {b}}}} $ versus $ {\chi _{{\mathrm {h}}}} $ as defined in Eq. (xxxxx) for (left) simulated background processes and (right) the signal process with $ {m_{\mathrm {a_1}}} =$ 40 GeV. The contours encircle the area with $ {\chi ^2} < $ 5. |
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Figure 1-a:
The distribution of $ {\chi _{{\mathrm {b}} {\mathrm {b}}}} $ versus $ {\chi _{{\mathrm {h}}}} $ as defined in Eq. (xxxxx) for (left) simulated background processes and (right) the signal process with $ {m_{\mathrm {a_1}}} =$ 40 GeV. The contours encircle the area with $ {\chi ^2} < $ 5. |
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Figure 1-b:
The distribution of $ {\chi _{{\mathrm {b}} {\mathrm {b}}}} $ versus $ {\chi _{{\mathrm {h}}}} $ as defined in Eq. (xxxxx) for (left) simulated background processes and (right) the signal process with $ {m_{\mathrm {a_1}}} =$ 40 GeV. The contours encircle the area with $ {\chi ^2} < $ 5. |
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Figure 2:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
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Figure 2-a:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
png pdf |
Figure 2-b:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
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Figure 2-c:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
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Figure 2-d:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
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Figure 2-e:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
png pdf |
Figure 2-f:
The distribution of the $ {p_{\mathrm {T}}} $ of the (top left) dimuon and (top right) di-b-jet system, the mass of the (middle left) di-b-jet and (middle right) $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, and (bottom left) the $ {p_{\mathrm {T}}} $ of the $ {{\mu}} {{\mu}}{{\mathrm {b}} {\mathrm {b}}}$ system, all after requiring two muons and two b-tagged jets in the event. Simulated samples are normalised to an integrated luminosity of 35.9 fb$^{-1}$ using their theoretical cross sections. |
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Figure 3:
The best fit output to the data under the background-only hypothesis for the (top-left) TL category, (top right) TM category, (bottom left) TT category and (bottom right) all categories, presented together with 68% CL uncertainty band for the background model. |
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Figure 3-a:
The best fit output to the data under the background-only hypothesis for the (top-left) TL category, (top right) TM category, (bottom left) TT category and (bottom right) all categories, presented together with 68% CL uncertainty band for the background model. |
png pdf |
Figure 3-b:
The best fit output to the data under the background-only hypothesis for the (top-left) TL category, (top right) TM category, (bottom left) TT category and (bottom right) all categories, presented together with 68% CL uncertainty band for the background model. |
png pdf |
Figure 3-c:
The best fit output to the data under the background-only hypothesis for the (top-left) TL category, (top right) TM category, (bottom left) TT category and (bottom right) all categories, presented together with 68% CL uncertainty band for the background model. |
png pdf |
Figure 3-d:
The best fit output to the data under the background-only hypothesis for the (top-left) TL category, (top right) TM category, (bottom left) TT category and (bottom right) all categories, presented together with 68% CL uncertainty band for the background model. |
png pdf |
Figure 4:
Observed and expected upper limits at 95% CL on the (left) Higgs boson production times $ {{\mathcal B}({{\mathrm {h}}}\to {{{\mathrm {a_1}}} {{\mathrm {a_1}}}}\to {{{\mu ^+}} {{\mu ^-}}} {{{\mathrm {b}} {\overline {\mathrm {b}}}}})} $ and (right) the branching ratio as a function of $ {m_{\mathrm {a_1}}} $. The inner and outer bands indicate the regions containing the distribution of limits located within 68% and 95% confidence intervals, respectively, of the expectation under the background-only hypothesis. |
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Figure 4-a:
Observed and expected upper limits at 95% CL on the (left) Higgs boson production times $ {{\mathcal B}({{\mathrm {h}}}\to {{{\mathrm {a_1}}} {{\mathrm {a_1}}}}\to {{{\mu ^+}} {{\mu ^-}}} {{{\mathrm {b}} {\overline {\mathrm {b}}}}})} $ and (right) the branching ratio as a function of $ {m_{\mathrm {a_1}}} $. The inner and outer bands indicate the regions containing the distribution of limits located within 68% and 95% confidence intervals, respectively, of the expectation under the background-only hypothesis. |
png pdf |
Figure 4-b:
Observed and expected upper limits at 95% CL on the (left) Higgs boson production times $ {{\mathcal B}({{\mathrm {h}}}\to {{{\mathrm {a_1}}} {{\mathrm {a_1}}}}\to {{{\mu ^+}} {{\mu ^-}}} {{{\mathrm {b}} {\overline {\mathrm {b}}}}})} $ and (right) the branching ratio as a function of $ {m_{\mathrm {a_1}}} $. The inner and outer bands indicate the regions containing the distribution of limits located within 68% and 95% confidence intervals, respectively, of the expectation under the background-only hypothesis. |
png pdf |
Figure 5:
Observed upper limits on ${\mathcal B}({\mathrm {h}} \to {{\mathrm {a_1}}} {{\mathrm {a_1}}})$ in the plane of ($ {m_{\mathrm {a_1}}}, {\tan\beta} $) for (left) type-III and (right) type-IV 2HDM+S, using only the $ {{{{\mu ^+}} {{\mu ^-}}} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ signal. |
png pdf |
Figure 5-a:
Observed upper limits on ${\mathcal B}({\mathrm {h}} \to {{\mathrm {a_1}}} {{\mathrm {a_1}}})$ in the plane of ($ {m_{\mathrm {a_1}}}, {\tan\beta} $) for (left) type-III and (right) type-IV 2HDM+S, using only the $ {{{{\mu ^+}} {{\mu ^-}}} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ signal. |
png pdf |
Figure 5-b:
Observed upper limits on ${\mathcal B}({\mathrm {h}} \to {{\mathrm {a_1}}} {{\mathrm {a_1}}})$ in the plane of ($ {m_{\mathrm {a_1}}}, {\tan\beta} $) for (left) type-III and (right) type-IV 2HDM+S, using only the $ {{{{\mu ^+}} {{\mu ^-}}} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ signal. |
png pdf |
Figure 6:
Observed upper limits on ${\mathcal B}({\mathrm {h}} \to {{\mathrm {a_1}}} {{\mathrm {a_1}}})$ in the plane of ($ {m_{\mathrm {a_1}}}, {\tan\beta} $) for type-III 2HDM+S, including $ {{{{\mu ^+}} {{\mu ^-}}} {{\tau}^{+} {\tau}^{-}}} $ signal that is misidentified as ${{{{\mu ^+}} {{\mu ^-}}} {{\mathrm {b}} {\overline {\mathrm {b}}}}}$. |
| Tables | |
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Table 1:
Event yields for simulated processes and data after requiring two muons and two b jets (${{{{\mu ^+}} {{\mu ^-}}} {{\mathrm {b}} {\overline {\mathrm {b}}}}}$ selection) and after the final selection. The expected number of simulated events is normalised to the integrated luminosity of 35.9 fb$^{-1}$. Uncertainties are only statistical. |
| Summary |
| A search for the Higgs boson decay to a pair of new pseudoscalars ${\mathrm{h}}\to{{\mathrm{a1}}} {{\mathrm{a1}}} \to \mu^{+}\mu^{-}\mathrm{b\bar{b}}$, motivated by the NMSSM and extensions to two-Higgs-doublet models, is carried out using a sample of proton-proton collision data corresponding to an integrated luminosity of 35.9 fb$^{-1}$ at $\sqrt{s}=$ 13 TeV. No statistically significant excess is found in data with respect to the SM background prediction. The results of the analysis are presented in the form of upper limits, at 95% Cl, on the Higgs boson production cross section times branching ration, ${\sigma_{\mathrm{h}}\times{{\mathcal B}({\mathrm{h}}\to{{{\mathrm{a1}}} {{\mathrm{a1}}} }\to\mu^{+}\mu^{-}{\mathrm{b\bar{b}}})}} $ as well as on the Higgs boson branching ratio assuming the SM prediction of $\sigma_{\mathrm{h}}$. The former ranges between 5 to 36 fb, depending on $\mathrm{m}_\mathrm{a1}$. The corresponding limits on the branching ratio are (1-6)$\times 10^{-{4}}$ for the mass range of 20 $ \leq \mathrm{a1} \leq $ 62.5 GeV. In an analysis performed by ATLAS [19], the limits on the branching ratio range between $2\times10^{-4}$ and $10^{-3}$. Compared with the similar analysis in Run I [15], the expected upper limits on the branching ratio are improved by more than a factor of two. |
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Compact Muon Solenoid LHC, CERN |
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