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| CMS-B2G-17-009 ; CERN-EP-2017-338 | ||
| Search for single production of vector-like quarks decaying to a b quark and a Higgs boson | ||
| CMS Collaboration | ||
| 5 February 2018 | ||
| JHEP 06 (2018) 031 | ||
| Abstract: A search is presented for single production of heavy vector-like quarks (B) that decay to a Higgs boson and a b quark, with the Higgs boson decaying to a highly boosted $ \mathrm{b\bar{b}} $ pair reconstructed as a single collimated jet. The analysis is based on data collected by the CMS experiment in proton-proton collisions at $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The data are consistent with background expectations, and upper limits at 95% confidence level on the product of the B quark cross section and the branching fraction are obtained in the range 1.28-0.07 pb, for a narrow B quark with a mass between 700 and 1800 GeV. The production of B quarks with widths of 10, 20 and 30% of the resonance mass is also considered, and the sensitivities obtained are similar to those achieved in the narrow width case. This is the first search at the CERN LHC for the single production of a B quark through its fully hadronic decay channel, and the first study considering finite resonance widths of the B quark. | ||
| Links: e-print arXiv:1802.01486 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The leading-order Feynman diagram for the production of a single vector-like B quark in association with a b quark and light-flavour quark, and its decay to a Higgs boson and a b quark. |
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Figure 2:
The b-tagged subjet multiplicity of AK8 jets in events passing preselection criteria. The lower panel shows the ratio of data to the MC background prediction. The normalization of the contributions from signals at $ {m_{{{\mathrm {B}}}}}= $ 1 and 1.8 TeV is multiplied by a factor of 500. Background events are normalized to data. Only the statistical uncertainties are taken into consideration here, and they are too small to be visible. |
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Figure 3:
Multiplicity of forward jets before event categorization. The normalization of the signal contributions is multiplied by a factor of 500. The simulated background predictions are normalized to data. The lower panel shows the ratio of data to background. We show only the statistical uncertainties. |
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Figure 4:
Distribution in the reconstructed B quark mass, after applying all selections to events with no forward jets (left) and to events with at least one forward jet (right), compared to the background distributions estimated before fitting. The upper and lower plots refer to the low- and high-mass $ {m_{{{\mathrm {B}}}}} $ analyses, respectively. The expectations for signal MC events are given by the blue histogram lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratios of observations to background expectations are given in the lower panels, together with the total uncertainties prior to fitting, indicated by the grey-hatched band. |
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Figure 4-a:
Distribution in the reconstructed B quark mass, after applying all selections to events with no forward jet, compared to the background distributions estimated before fitting. The plot refers to the low-mass $ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue histogram lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of observations to background expectations is given in the lower panel, together with the total uncertainties prior to fitting, indicated by the grey-hatched band. |
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Figure 4-b:
Distribution in the reconstructed B quark mass, after applying all selections to events with at least one forward jet, compared to the background distributions estimated before fitting. The plot refers to the low-mass $ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue histogram lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of observations to background expectations is given in the lower panel, together with the total uncertainties prior to fitting, indicated by the grey-hatched band. |
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Figure 4-c:
Distribution in the reconstructed B quark mass, after applying all selections to events with no forward jet, compared to the background distributions estimated before fitting. The plot refers to the high-mass $ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue histogram lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of observations to background expectations is given in the lower panel, together with the total uncertainties prior to fitting, indicated by the grey-hatched band. |
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Figure 4-d:
Distribution in the reconstructed B quark mass, after applying all selections to events with at least one forward jet, compared to the background distributions estimated before fitting. The plot refers to the high-mass $ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue histogram lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of observations to background expectations is given in the lower panel, together with the total uncertainties prior to fitting, indicated by the grey-hatched band. |
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Figure 5:
Distribution in the reconstructed B quark mass after applying all selections to events with no forward jets (left) and to events with at least one forward jet (right), compared to the background distributions estimated after fitting. The upper and lower plots refer to the low- and high-$ {m_{{{\mathrm {B}}}}} $ analyses, respectively. The expectations for signal MC events are given by the blue lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratios of the observations to background expectations are given in the lower panels, together with the total uncertainties after fitting, indicated by the grey-hatched band. |
png pdf |
Figure 5-a:
Distribution in the reconstructed B quark mass after applying all selections to events with no forward jet, compared to the background distributions estimated after fitting. The plot refers to the low-$ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of the observations to background expectations is given in the lower panel, together with the total uncertainties after fitting, indicated by the grey-hatched band. |
png pdf |
Figure 5-b:
Distribution in the reconstructed B quark mass after applying all selections to events with at least one forward jet, compared to the background distributions estimated after fitting. The plot refers to the low-$ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of the observations to background expectations is given in the lower panel, together with the total uncertainties after fitting, indicated by the grey-hatched band. |
png pdf |
Figure 5-c:
Distribution in the reconstructed B quark mass after applying all selections to events with no forward jet, compared to the background distributions estimated after fitting. The plot refers to the high-$ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of the observations to background expectations is given in the lower panel, together with the total uncertainties after fitting, indicated by the grey-hatched band. |
png pdf |
Figure 5-d:
Distribution in the reconstructed B quark mass after applying all selections to events with at least one forward jet, compared to the background distributions estimated after fitting. The plot refers to the high-$ {m_{{{\mathrm {B}}}}} $ analysis. The expectations for signal MC events are given by the blue lines. Different contributions to background are indicated by the colour-filled histograms. The grey-hatched error band shows total uncertainties in the background expectation. The ratio of the observations to background expectations is given in the lower panel, together with the total uncertainties after fitting, indicated by the grey-hatched band. |
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Figure 6:
The median observed and expected 95% CL upper limits on the product of the B quark production cross section and branching fraction as a function of the signal mass, assuming narrow-width resonances (upper-left) and widths of 10 (upper-right), 20 (lower-left), and 30% (lower-right) of the resonance mass for the B quark. The results are shown for the combination of 0 and $ > $0 forward-jet categories. The continuous red curves correspond to the theoretical expectations for singlet and doublet models. |
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Figure 6-a:
The median observed and expected 95% CL upper limits on the product of the B quark production cross section and branching fraction as a function of the signal mass, assuming narrow-width resonances. The results are shown for the combination of 0 and $ > $0 forward-jet categories. The continuous red curves correspond to the theoretical expectations for singlet and doublet models. |
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Figure 6-b:
The median observed and expected 95% CL upper limits on the product of the B quark production cross section and branching fraction as a function of the signal mass, assuming a width of 10% of the resonance mass for the B quark. The results are shown for the combination of 0 and $ > $0 forward-jet categories. The continuous red curves correspond to the theoretical expectations for singlet and doublet models. |
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Figure 6-c:
The median observed and expected 95% CL upper limits on the product of the B quark production cross section and branching fraction as a function of the signal mass, assuming a width of 20% of the resonance mass for the B quark. The results are shown for the combination of 0 and $ > $0 forward-jet categories. The continuous red curves correspond to the theoretical expectations for singlet and doublet models. |
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Figure 6-d:
The median observed and expected 95% CL upper limits on the product of the B quark production cross section and branching fraction as a function of the signal mass, assuming a width of 30% of the resonance mass for the B quark. The results are shown for the combination of 0 and $ > $0 forward-jet categories. The continuous red curves correspond to the theoretical expectations for singlet and doublet models. |
| Tables | |
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Table 1:
Cross sections for $ {\mathrm {p}} {\mathrm {p}}\to {{\mathrm {B}}} {\mathrm {b}} {\mathrm {q}}$, with the ratio $\Gamma _{{{\mathrm {B}}}}/ {m_{{{\mathrm {B}}}}}$ fixed to 1% (NWA). The couplings and branching fractions in simplified models are calculated using the equations in the text. The uncertainties in the production cross sections correspond to the halving and doubling of the QCD renormalization and factorization scales |
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Table 2:
Cross sections for $ {\mathrm {p}} {\mathrm {p}}\to {{\mathrm {B}}} {\mathrm {b}} {\mathrm {q}}$ for three values of the $\Gamma _{{{\mathrm {B}}}}/ {m_{{{\mathrm {B}}}}} $ ratio. The conditions assume that singlets and doublets have $\kappa _{{\mathrm {W}}} = \kappa _{{\mathrm {Z}}} = \kappa _{{\mathrm {H}}}\equiv \kappa $, $\kappa _{{\mathrm {W}}} = $ 0 and $\kappa _{{\mathrm {Z}}} = \kappa _{{\mathrm {H}}}\equiv \kappa $, respectively. For each $\Gamma _{{{\mathrm {B}}}}/ {m_{{{\mathrm {B}}}}} $, we provide the values of $\tilde\sigma _\text {AW}$ and of the physical cross sections for both the singlet and doublet models, $\sigma _\text {S}$ and $\sigma _\text {D}$ respectively. The uncertainties in the production cross sections correspond to the halving and doubling of the QCD renormalization and factorization scales. The values of $\kappa $ are listed in the parentheses. |
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Table 3:
Summary of systematic uncertainties in background events. The quantification of the effects quoted in the table reflects the uncertainties in the event yields. All uncertainties are considered in the simulated background events, except the one on background estimation that affects only the data-based estimate of the multijet process. All the systematic uncertainties apply to both categories of forward-jet multiplicity, except for the case of the modelling of the forward jets, where the first entry corresponds to the category with no forward jets, and the second entry to the category with at least one jet in the forward region. |
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Table 4:
Observed and expected fitted number of events in the signal ranges of 700 $ < {m_{{{\mathrm {B}}}}} < $ 1500 and 1500 $ < {m_{{{\mathrm {B}}}}} < $ 1800 GeV, and expected signal at $ {m_{{{\mathrm {B}}}}}= $ 1000 and 1800 GeV. The multijet background is obtained from data, while the yields for the other sources of background are obtained from MC simulation. The combined statistical and systematic uncertainties correspond to the quadrature of the statistical and systematic uncertainties. |
| Summary |
|
A search has been presented for electroweak production of vector-like B quarks with charge $-1/3\,e$, decaying to a bottom quark and a Higgs boson (H). The analysis uses a data sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$ , collected in pp collisions at $\sqrt{s} = $ 13 TeV. No significant deviations are observed relative to the standard model prediction, and upper limits are placed on the product of the cross section and the branching fraction of the B quark. Expected and observed limits at 95% confidence level vary from 1.20 to 0.07 pb and from 1.28 to 0.07 pb, respectively, for B quark masses in the range considered, which extends from 700 to 1800 GeV. The search is performed under the hypothesis of a singlet or doublet B quark of narrow width decaying to Hb with a branching fraction of approximately 25%. The possibility of having non-negligible resonant widths is also studied. Limits obtained on the production of B quarks with widths of 10, 20, and 30% of the resonance mass are comparable to those found for the narrow-width approximation. This search extends existing knowledge on vector-like quarks, by interpreting the results in a new theoretical framework with non-negligible resonance widths, and investigating the final state with a bottom quark and a Higgs boson for the first time. |
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Compact Muon Solenoid LHC, CERN |
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