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| CMS-SUS-16-043 ; CERN-EP-2017-113 | ||
| Search for electroweak production of charginos and neutralinos in WH events in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 30 June 2017 | ||
| JHEP 11 (2017) 029 | ||
| Abstract: Results are reported from a search for physics beyond the standard model in proton-proton collision events with a charged lepton (electron or muon), two jets identified as originating from a bottom quark decay, and significant imbalance in the transverse momentum. The search was performed using a data sample corresponding to 35.9 fb$^{-1}$, collected by the CMS experiment in 2016 at $ \sqrt{s} = $ 13 TeV. Events with this signature can arise, for example, from the electroweak production of gauginos, which are predicted in models based on supersymmetry. The event yields observed in data are consistent with the estimated standard model backgrounds. Limits are obtained on the cross sections for chargino-neutralino ($\tilde{\chi}^{\pm}_1 \tilde{\chi}^0_2 $) production in a simplified model of supersymmetry with the decays $\tilde{\chi}^{\pm}_1 \to\mathrm{ W }^{\pm} \tilde{\chi}^0_1 $ and $\tilde{\chi}^0_2 \to\mathrm{ H } \tilde{\chi}^0_1 $. Values of $m_{\tilde{\chi}^{\pm}_1 }$ between 220 and 490 GeV are excluded at 95% confidence level by this search when the $\tilde{\chi}^0_1 $ is massless, and values of $m_{\tilde{\chi}^0_1 }$ are excluded up to 110 GeV for $m_{\tilde{\chi}^{\pm}_1 } \approx $ 450 GeV. | ||
| Links: e-print arXiv:1706.09933 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Additional information on efficiencies needed for reinterpretation of these results are available here. Additional technical material for CMS speakers can be found here. |
| Figures | |
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Figure 1:
Diagram corresponding to the SUSY simplified model targeted by this analysis, i.e., chargino-neutralino production, with the chargino decaying to a $\mathrm{ W } $ boson and an LSP, while the heavier neutralino decays to a Higgs boson and an LSP. |
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Figure 2:
Distributions in $ {M_{ {\mathrm{ b \bar{b} } } }} $ (top left), $ {E_{\mathrm {T}}^{\text {miss}}} $ (top right), $ {M_{\mathrm {T}}} $ (bottom left), and $ {M_{\mathrm {CT}}} $ (bottom right) for signal and background events in simulation after the preselection. The $ {E_{\mathrm {T}}^{\text {miss}}} $, $ {M_{\mathrm {T}}} $, and $ {M_{\mathrm {CT}}} $ distributions are shown after the 90 $ < {M_{ {\mathrm{ b \bar{b} } } }} < $ 150 GeV requirement. Expected signal distributions are also overlaid as open histograms for various mass points, with the signal cross section scaled up by a factor of 50 for display purposes. The legend entries for signal give the masses $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV and the factor by which the signal cross section has been scaled. |
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Figure 2-a:
Distribution in $ {M_{ {\mathrm{ b \bar{b} } } }} $ for signal and background events in simulation after the preselection. Expected signal distributions are also overlaid as open histograms for various mass points, with the signal cross section scaled up by a factor of 50 for display purposes. The legend entries for signal give the masses $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV and the factor by which the signal cross section has been scaled. |
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Figure 2-b:
Distribution in $ {E_{\mathrm {T}}^{\text {miss}}} $ for signal and background events in simulation after the preselection. The distribution is shown after the 90 $ < {M_{ {\mathrm{ b \bar{b} } } }} < $ 150 GeV requirement. Expected signal distributions are also overlaid as open histograms for various mass points, with the signal cross section scaled up by a factor of 50 for display purposes. The legend entries for signal give the masses $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV and the factor by which the signal cross section has been scaled. |
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Figure 2-c:
Distribution in $ {M_{\mathrm {T}}} $ for signal and background events in simulation after the preselection. The distribution is shown after the 90 $ < {M_{ {\mathrm{ b \bar{b} } } }} < $ 150 GeV requirement. Expected signal distributions are also overlaid as open histograms for various mass points, with the signal cross section scaled up by a factor of 50 for display purposes. The legend entries for signal give the masses $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV and the factor by which the signal cross section has been scaled. |
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Figure 2-d:
Distribution in $ {M_{\mathrm {CT}}} $ for signal and background events in simulation after the preselection. The distribution is shown after the 90 $ < {M_{ {\mathrm{ b \bar{b} } } }} < $ 150 GeV requirement. Expected signal distributions are also overlaid as open histograms for various mass points, with the signal cross section scaled up by a factor of 50 for display purposes. The legend entries for signal give the masses $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV and the factor by which the signal cross section has been scaled. |
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Figure 3:
(left) Distribution in $ {M_{ {\mathrm{ b \bar{b} } } }} $ in $ {\mathrm {CR}2\ell } $ after the selections in Table 1, comparing data to MC simulation. (right) Distribution in $ {M_{ {\mathrm{ b \bar{b} } } }} $ in $ {\mathrm {CRM} {\mathrm{ b \bar{b} } } } $ after preselection with the $ {M_{\mathrm {T}}} $ requirement tightened to be 150 GeV. The signal region range of 90 $ \leq {M_{ {\mathrm{ b \bar{b} } } }} \leq $ 150 GeV has been removed from the plot. |
png pdf |
Figure 3-a:
Distribution in $ {M_{ {\mathrm{ b \bar{b} } } }} $ in $ {\mathrm {CR}2\ell } $ after the selections in Table 1, comparing data to MC simulation. |
png pdf |
Figure 3-b:
Distribution in $ {M_{ {\mathrm{ b \bar{b} } } }} $ in $ {\mathrm {CRM} {\mathrm{ b \bar{b} } } } $ after preselection with the $ {M_{\mathrm {T}}} $ requirement tightened to be 150 GeV. The signal region range of 90 $ \leq {M_{ {\mathrm{ b \bar{b} } } }} \leq $ 150 GeV has been removed from the plot. |
png pdf |
Figure 4:
Distribution in $ {M_{\mathrm {T}}} $ in $ {\mathrm {CR}0\mathrm{ b } } $ after requiring the analysis preselection, the dijet mass window selection, and $ {M_{\mathrm {CT}}} > $ 170 GeV. |
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Figure 5:
Distributions in $ {M_{ {\mathrm{ b \bar{b} } } }} $ after all signal region kinematic requirements for the two exclusive $ {E_{\mathrm {T}}^{\text {miss}}} $ bins (left: 125 $ \leq {E_{\mathrm {T}}^{\text {miss}}} < $ 200 GeV, right: $ {E_{\mathrm {T}}^{\text {miss}}} \geq $ 200 GeV). The signal region is 90 $ \leq {M_{ {\mathrm{ b \bar{b} } } }} \leq $ 150 GeV. The hatched band shows the total uncertainty in the background prediction, including statistical and systematic components. The expected signal distribution for a reference SUSY model is overlaid as an open histogram, and the legend (on the last line) gives the masses as $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV. |
png pdf |
Figure 5-a:
Distributions in $ {M_{ {\mathrm{ b \bar{b} } } }} $ after all signal region kinematic requirements for the two exclusive $ {E_{\mathrm {T}}^{\text {miss}}} $ bins (125 $ \leq {E_{\mathrm {T}}^{\text {miss}}} < $ 200 GeV). The signal region is 90 $ \leq {M_{ {\mathrm{ b \bar{b} } } }} \leq $ 150 GeV. The hatched band shows the total uncertainty in the background prediction, including statistical and systematic components. The expected signal distribution for a reference SUSY model is overlaid as an open histogram, and the legend (on the last line) gives the masses as $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV. |
png pdf |
Figure 5-b:
Distributions in $ {M_{ {\mathrm{ b \bar{b} } } }} $ after all signal region kinematic requirements for the two exclusive $ {E_{\mathrm {T}}^{\text {miss}}} $ bins ($ {E_{\mathrm {T}}^{\text {miss}}} \geq $ 200 GeV). The signal region is 90 $ \leq {M_{ {\mathrm{ b \bar{b} } } }} \leq $ 150 GeV. The hatched band shows the total uncertainty in the background prediction, including statistical and systematic components. The expected signal distribution for a reference SUSY model is overlaid as an open histogram, and the legend (on the last line) gives the masses as $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ in GeV. |
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Figure 6:
Exclusion limits at the 95% CL in the plane of $m_{\tilde{\chi}^{\pm}_1 }$ and $m_{\tilde{\chi}^0_1 }$. The area below the thick black (dashed red) curve represents the observed (expected) exclusion region. The thin dashed red line indicates the +1 s.d.$_{\text {exp.}}$ experimental uncertainty. The -1 s.d.$_{\text {exp.}}$ line does not appear as no mass points would be excluded in that case. The thin black lines show the effect of the theoretical uncertainties ($\pm $1 s.d.$_{\text {theory}}$) on the signal cross section. |
png pdf root |
Figure 6-a:
Cross section exclusion limits at the 95% CL are shown for $\tilde{\chi}^{\pm}_1 \tilde{\chi}^0_2 \to \mathrm{ W } ^{\pm }\mathrm{ H } \tilde{\chi}^0_1 \tilde{\chi}^0_1 $ as a function of $m_{\tilde{\chi}^{\pm}_1 }$, assuming $m_{\tilde{\chi}^0_1 } = 1$ GeV. The solid black line and points represent the observed exclusion. The dashed black line represents the expected exclusion, while the green and yellow bands indicate the $\pm $1 and 2 standard deviation (s.d.) uncertainties in the expected limit. The magenta line shows the theoretical cross section with its uncertainty. |
png pdf root |
Figure 6-b:
Exclusion limits at the 95% CL in the plane of $m_{\tilde{\chi}^{\pm}_1 }$ and $m_{\tilde{\chi}^0_1 }$. The area below the thick black (dashed red) curve represents the observed (expected) exclusion region. The thin dashed red line indicates the +1 s.d.$_{\text {exp.}}$ experimental uncertainty. The -1 s.d.$_{\text {exp.}}$ line does not appear as no mass points would be excluded in that case. The thin black lines show the effect of the theoretical uncertainties ($\pm $1 s.d.$_{\text {theory}}$) on the signal cross section. |
| Tables | |
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Table 1:
Event selections in signal and control regions. |
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Table 2:
Expected and observed event yields in the signal regions. The uncertainties shown include both statistical and systematic sources. The correlation coefficient for the background prediction between the two bins is 0.61. Predicted yields are shown also for several signal models with the masses $(m_{\tilde{\chi}^{\pm}_1 }, m_{\tilde{\chi}^0_1 })$ indicated in GeV and with statistical-only uncertainties. |
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Table 3:
Sources of systematic uncertainty in the estimated signal yield, along with their typical values. The ranges represent variation across the signal masses probed. |
| Summary |
| A search is performed for beyond the standard model physics in events with a leptonically decaying W boson, a Higgs boson decaying to a $\mathrm{ b \bar{b} }$ pair, and large transverse momentum imbalance. The search uses proton-proton collision data recorded by the CMS experiment in 2016 at $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The event yields observed in data are consistent with the estimated standard model backgrounds. The results are used to set cross section limits on chargino-neutralino production in a simplified supersymmetric model with degenerate masses for $\tilde{\chi}^{\pm}_1 $ and $\tilde{\chi}^0_2 $ and with the decays $\tilde{\chi}^{\pm}_1 \to\mathrm{ W }^{\pm}\tilde{\chi}^0_1 $ and $\tilde{\chi}^0_2 \to\mathrm{ H }\tilde{\chi}^0_1 $. Values of $m_{\tilde{\chi}^{\pm}_1 }$ between 220 and 490 GeV are excluded at 95% confidence level by this search when the $\tilde{\chi}^0_1 $ is massless, and values of $m_{\tilde{\chi}^0_1 }$ are excluded up to 110 GeV for $m_{\tilde{\chi}^{\pm}_1 } \approx $ 450 GeV. These results significantly extend the previous best limits, by up to 270 GeV in $m_{\tilde{\chi}^{\pm}_1 }$ and up to 90 GeV in $m_{\tilde{\chi}^0_1 }$. |
| Additional Tables | |
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Additional Table 1:
Cutflow of yields with 35.9 fb$^{-1}$ data for various signal model points, given as $(m_{\tilde{\chi }_{1}^{\pm }},m_{ {\tilde{\chi }_{1}^{0}}})$. The yields are normalized to the theoretical cross sections. The "All events'' category below starts from all generated events where the W boson decays leptonically and the Higgs boson decays to ${\mathrm{ b \bar{b} } } $, taking into account a branching ratio of 0.175. |
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