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| CMS-PAS-HIG-16-018 | ||
| Search for Higgs bosons produced in association with b quarks and decaying into a b-quark pair with 13 TeV data | ||
| CMS Collaboration | ||
| January 2018 | ||
| Abstract: A search for Higgs bosons that decay into a b quark-antiquark pair and are accompanied by at least one additional b quark is performed with the CMS detector. The data analyzed were recorded in proton-proton collisions at a centre-of-mass energy of 13 TeV at the LHC, corresponding to an integrated luminosity of 35.7 fb$^{-1}$. The final state considered is particularly sensitive to signatures of a Higgs sector beyond the standard model, as predicted by the minimal supersymmetric standard model (MSSM) and the two Higgs doublet model (2HDM) with large values of the parameter $\tan \beta$. No signal above the standard model background expectation is observed. Stringent upper limits on the cross section times branching fraction are set for Higgs bosons with masses up to 1300 GeV at 95% confidence level. The results are interpreted within several MSSM and 2HDM scenarios. In the hMSSM scenario, upper limits on $\tan \beta$ are obtained, ranging from 22 to 60 for Higgs masses from 300 to 900 GeV. In the flipped 2HDM scenario, similar upper limits on $\tan \beta$ are set over the full $\cos(\beta-\alpha)$ range and for Higgs masses from 300 to 850 GeV. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 08 (2018) 113. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Example Feynman diagrams of the signal processes. |
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Figure 1-a:
Example Feynman diagram of the signal process. |
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Figure 1-b:
Example Feynman diagram of the signal process. |
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Figure 1-c:
Example Feynman diagram of the signal process. |
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Figure 2:
Signal mass distributions and parameterizations as obtained from simulation for different Higgs masses: 400 GeV (red), 600 GeV (blue), and 1100 GeV (green). |
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Figure 3:
Signal efficiency as a function of the Higgs boson mass after different stages of event selection: offline kinematic selection (black), online trigger selection (red) and offline b tagging selection (green). |
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Figure 4:
Invariant dijet mass $ {\mathrm {M}_{12}} $ in the reverse-b-tag control region in the three subranges used for the fit: $ {\mathrm {M}_{12}} = $ [200, 650] GeV (top left) in linear scale, $ {\mathrm {M}_{12}} = $ [350, 1190] GeV (top right) and $ {\mathrm {M}_{12}} = $ [500, 1700] GeV (bottom) in logarithmic scale. The dots represent the data. The red line is the result of the fit of the background parameterizations described in the text. In the bottom panel of each plot the normalized difference ($\frac {\mathrm {Data}-\mathrm {Fit}}{\sqrt {\mathrm {Fit}}}$) is shown. |
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Figure 4-a:
Invariant dijet mass $ {\mathrm {M}_{12}} $ in the reverse-b-tag control region in the one of the subranges used for the fit: $ {\mathrm {M}_{12}} = $ [200, 650] GeV in linear scale. The dots represent the data. The red line is the result of the fit of the background parameterizations described in the text. In the bottom panel the normalized difference ($\frac {\mathrm {Data}-\mathrm {Fit}}{\sqrt {\mathrm {Fit}}}$) is shown. |
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Figure 4-b:
Invariant dijet mass $ {\mathrm {M}_{12}} $ in the reverse-b-tag control region in the one of the subranges used for the fit: $ {\mathrm {M}_{12}} = $ [350, 1190] GeV in logarithmic scale. The dots represent the data. The red line is the result of the fit of the background parameterizations described in the text. In the bottom panel the normalized difference ($\frac {\mathrm {Data}-\mathrm {Fit}}{\sqrt {\mathrm {Fit}}}$) is shown. |
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Figure 4-c:
Invariant dijet mass $ {\mathrm {M}_{12}} $ in the reverse-b-tag control region in the one of the subranges used for the fit: $ {\mathrm {M}_{12}} = $ [500, 1700] GeV in logarithmic scale. The dots represent the data. The red line is the result of the fit of the background parameterizations described in the text. In the bottom panel the normalized difference ($\frac {\mathrm {Data}-\mathrm {Fit}}{\sqrt {\mathrm {Fit}}}$) is shown. |
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Figure 5:
Distribution of the dijet mass $ {\mathrm {M}_{12}} $ in the data triple-b-tag sample showing the three subranges together with the background-only fit. The shaded area shows the post-fit uncertainty. For illustration, the expected signal contribution for three representative mass points is shown, scaled to cross sections suitable for visualization. The kink at around 350 GeV of the 300 GeV signal shape is caused by the wrong-pairing background. In the bottom panels the normalized difference ($\frac {\mathrm {Data}-\mathrm {Bkg}}{\sqrt {\mathrm {Bkg}}}$), where Bkg is the background as estimated by the fit, for the three subranges is shown. |
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Figure 6:
Expected and observed upper limits on $\sigma ({\mathrm {p}} {\mathrm {p}}\to {\mathrm {b}} {\rm A/H}+\mathrm {X})\, \mathcal {B}({\rm A/H}\to {{\mathrm {b}} {\overline {\mathrm {b}}}})$ at 95% CL as a function of the Higgs boson mass ${m_{\mathrm {A/H}}}$. For the observed limit, three different marker types are used to distinguish the three subranges in which the results have been obtained. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. |
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Figure 7:
Expected and observed upper limits at 95% CL for ${m_{\mathrm {A/H}}}$ vs. the MSSM parameter $ \tan \beta $ in the (left) $m_{\rm h}^{\rm mod+}$ benchmark scenario with $\mu = $ +200 GeV, and (right) in the hMSSM scenario. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. The excluded parameter space is indicated by the red shaded area. |
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Figure 7-a:
Expected and observed upper limits at 95% CL for ${m_{\mathrm {A/H}}}$ vs. the MSSM parameter $ \tan \beta $ in the $m_{\rm h}^{\rm mod+}$ benchmark scenario with \mu = $ +200 GeV. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. The excluded parameter space is indicated by the red shaded area. |
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Figure 7-b:
Expected and observed upper limits at 95% CL for ${m_{\mathrm {A/H}}}$ vs. the MSSM parameter $ \tan \beta $ in the hMSSM scenario. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. The excluded parameter space is indicated by the red shaded area. |
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Figure 8:
Expected and observed upper limits at 95% CL for ${m_{\mathrm {A/H}}}$ vs. the MSSM parameter $ \tan \beta $ in the (left) light $ \tilde{\tau} $ and the (right) light $ \tilde{\mathrm {t}} $ benchmark scenarios. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. The excluded parameter space is indicated by the red shaded area. |
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Figure 8-a:
Expected and observed upper limits at 95% CL for ${m_{\mathrm {A/H}}}$ vs. the MSSM parameter $ \tan \beta $ in the light $ \tilde{\tau} $ benchmark scenarios. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. The excluded parameter space is indicated by the red shaded area. |
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Figure 8-b:
Expected and observed upper limits at 95% CL for ${m_{\mathrm {A/H}}}$ vs. the MSSM parameter $ \tan \beta $ in the light $ \tilde{\mathrm {t}} $ benchmark scenarios. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. The excluded parameter space is indicated by the red shaded area. |
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Figure 9:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped (upper) and type-II (lower) models, as a function of $\cos (\beta -\alpha)$ in the range of $[-0.5,0.5]$ for the mass $m_{\rm H}=m_{\rm A}= $ 300 GeV (left) and as a function of ${m_{\mathrm {A/H}}}$ when $\cos (\beta -\alpha) = $ 0.1 (right). The results from the ATLAS $\mathrm {A} \rightarrow {\mathrm {Z}} {\mathrm {h}} $ analysis [32] are also shown as blue shaded area for comparison which provide limits up to $ \tan \beta $ of 50. |
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Figure 9-a:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped (upper) and type-II (lower) models, as a function of $\cos (\beta -\alpha)$ in the range of $[-0.5,0.5]$ for the mass $m_{\rm H}=m_{\rm A}= $ 300 GeV. The results from the ATLAS $\mathrm {A} \rightarrow {\mathrm {Z}} {\mathrm {h}} $ analysis [32] are also shown as blue shaded area for comparison which provide limits up to $ \tan \beta $ of 50. |
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Figure 9-b:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped (upper) and type-II (lower) models, as a function of ${m_{\mathrm {A/H}}}$ when $\cos (\beta -\alpha) = $ 0.1. The results from the ATLAS $\mathrm {A} \rightarrow {\mathrm {Z}} {\mathrm {h}} $ analysis [32] are also shown as blue shaded area for comparison which provide limits up to $ \tan \beta $ of 50. |
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Figure 9-c:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped (upper) and type-II (lower) models, as a function of $\cos (\beta -\alpha)$ in the range of $[-0.5,0.5]$ for the mass $m_{\rm H}=m_{\rm A}= $ 300 GeV (left) and as a function of ${m_{\mathrm {A/H}}}$ when $\cos (\beta -\alpha) = $ 0.1 (right). The results from the ATLAS $\mathrm {A} \rightarrow {\mathrm {Z}} {\mathrm {h}} $ analysis [32] are also shown as blue shaded area for comparison which provide limits up to $ \tan \beta $ of 50. |
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Figure 9-d:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped (upper) and type-II (lower) models, as a function of $\cos (\beta -\alpha)$ in the range of $[-0.5,0.5]$ for the mass $m_{\rm H}=m_{\rm A}= $ 300 GeV (left) and as a function of ${m_{\mathrm {A/H}}}$ when $\cos (\beta -\alpha) = $ 0.1 (right). The results from the ATLAS $\mathrm {A} \rightarrow {\mathrm {Z}} {\mathrm {h}} $ analysis [32] are also shown as blue shaded area for comparison which provide limits up to $ \tan \beta $ of 50. |
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Figure 10:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped (left) and type-II (right) models as a function of $\cos (\beta -\alpha)$ in the full range of $[-1.0,1.0]$, for the mass $m_{\rm H}=m_{\rm A}= $ 500 GeV. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. |
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Figure 10-a:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the flipped model as a function of $\cos (\beta -\alpha)$ in the full range of $[-1.0,1.0]$, for the mass $m_{\rm H}=m_{\rm A}= $ 500 GeV. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. |
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Figure 10-b:
Upper limits for the parameter $ \tan \beta $ at 95% confidence level for the type-II model as a function of $\cos (\beta -\alpha)$ in the full range of $[-1.0,1.0]$, for the mass $m_{\rm H}=m_{\rm A}= $ 500 GeV. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. |
| Tables | |
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Table 1:
The total signal efficiency in per mille as a function of the Higgs boson mass ${m_{\mathrm {A/H}}}$. |
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Table 2:
Expected and observed CLs upper limits on $\sigma ({\mathrm {p}} {\mathrm {p}}\to {\mathrm {b}} {\rm A/H}+\mathrm {X})\, \mathcal {B}({\rm A/H}\to {{\mathrm {b}} {\overline {\mathrm {b}}}})$ in pb as a function of ${m_{\mathrm {A/H}}}$, as obtained from the 13 TeV data. |
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Table 3:
Expected and observed CLs upper limits on $ \tan \beta $ as a function of ${m_{\mathrm {A}}} in the {m_{{\mathrm {h}}}^{\text {mod+}}}$, $\mu = $ +200 GeV, benchmark scenario obtained from a 13 TeV data. Since theoretical predictions for $ \tan \beta > $ 60 are not reliable, cells for which $ \tan \beta $ would exceed this value are indicated by --. |
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Table 4:
Expected and observed CLs upper limits on $ \tan \beta $ as a function of ${m_{\mathrm {A}}}$ in the hMSSM, $\mu = $ +200 GeV, benchmark scenario obtained from a 13 TeV data. Since theoretical predictions for $ \tan \beta > $ 60 are not reliable, cells for which $ \tan \beta $ would exceed this value are indicated by --. |
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Table 5:
Expected and observed CLs upper limits on $ \tan \beta $ as a function of ${m_{\mathrm {A}}}$ in the light $ \tilde{\tau} $, $\mu = $ +200 GeV, benchmark scenario. Since theoretical predictions for $ \tan \beta > 60$ are not reliable, cells for which $ \tan \beta $ would exceed this value are indicated by --. |
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Table 6:
Expected and observed CLs upper limits on $ \tan \beta $ as a function of ${m_{\mathrm {A}}}$ in the light $ \tilde{\mathrm{t}} $, $\mu = $ +200 GeV, benchmark scenario. Since theoretical predictions for $ \tan \beta > $ 60 are not reliable, cells for which $ \tan \beta $ would exceed this value are indicated by --. |
| Summary |
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A search for a heavy Higgs boson decaying into a b quark-antiquark pair and accompanied by at least one additional b quark has been performed. The data analyzed correspond to an integrated luminosity of 35.7 fb$^{-1}$, recorded in pp collisions at a centre-of-mass energy of 13 TeV at the LHC. For this purpose, dedicated triggers using all-hadronic jet signatures combined with online b tagging were developed. The signal is characterized by events with at least three b-tagged jets. The search has been performed in the invariant mass spectrum of the two leading b-tagged jets. No evidence for a signal is found. Upper limits on the Higgs boson cross section times branching fraction are obtained in the mass region 300-1300 GeV at 95% confidence level. They range from about 20 pb at the lower end of the mass range, to about 0.4 pb at 1100 GeV, and extend to considerably higher masses than those accessible to previous analyses performed. The results are interpreted within various MSSM benchmark scenarios. They yield upper limits on the model parameter ${\tan\beta}$ as a function of the mass parameter ${m_{\mathrm{A}}} $. The observed limit for ${\tan\beta}$ ranges down to about 25 at the lowest ${m_{\mathrm{A}}}$ value of 300 GeV in the ${m_{\mathrm{h}}^{\text{mod+}}} $ scenario with a higgsino mass parameter of $\mu= $ +200 GeV. The results are also interpreted in the 2HDM type-II and flipped scenarios. The limits obtained for the flipped scenario provide the only experimental upper limits in the region around zero of $\cos(\beta-\alpha)$, and strong unique constraints on $\tan\beta$. |
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