Search for bottom-squark pair production in $pp$ collision events at $\sqrt{s}=13$ TeV with hadronically decaying $\tau$-leptons, $b$-jets and missing transverse momentum using the ATLAS detector
A search for pair production of bottom squarks in events with hadronically decaying $\tau$-leptons, $b$-tagged jets and large missing transverse momentum is presented. The analyzed dataset is based on proton-proton collisions at $\sqrt{s}$ = 13 TeV delivered by the Large Hadron Collider and recorded by the ATLAS detector from 2015 to 2018, and corresponds to an integrated luminosity of 139 fb$^{-1}$. The observed data are compatible with the expected Standard Model background. Results are interpreted in a simplified model where each bottom squark is assumed to decay into the second-lightest neutralino $\tilde \chi_2^0$ and a bottom quark, with $\tilde \chi_2^0$ decaying into a Higgs boson and the lightest neutralino $\tilde \chi_1^0$. The search focuses on final states where at least one Higgs boson decays into a pair of hadronically decaying $\tau$-leptons. This allows the acceptance and thus the sensitivity to be significantly improved relative to the previous results at low masses of the $\tilde \chi_2^0$, where bottom-squark masses up to 850 GeV are excluded at the 95% confidence level, assuming a mass difference of 130 GeV between $\tilde \chi_2^0$ and $\tilde \chi_1^0$. Model-independent upper limits are also set on the cross section of processes beyond the Standard Model.
15 March 2021
Contact: SUSY conveners
internal
Figures
Figure 01
Simplified model of bottom-squark pair production and the decay chain targeted by this analysis.
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Figure 02a
Kinematic distributions of data and SM background for events that pass the preselection and have at least two hadronically decaying $\tau$-leptons. Predictions from three signal models are also shown, where the masses $m(\tilde b)$ and $m(\tilde\chi_2^0)$ are given in GeV in the legend. Distributions are displayed for the (a) $H$T, (b) $m(\tau_1, \tau_2)$ and (c) $m_{\mathrm{T2}}$ variables. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\tau\tau$)+jets, diboson/triboson, multijet). The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit described in Section 6. The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 02b
Kinematic distributions of data and SM background for events that pass the preselection and have at least two hadronically decaying $\tau$-leptons. Predictions from three signal models are also shown, where the masses $m(\tilde b)$ and $m(\tilde\chi_2^0)$ are given in GeV in the legend. Distributions are displayed for the (a) $H$T, (b) $m(\tau_1, \tau_2)$ and (c) $m_{\mathrm{T2}}$ variables. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\tau\tau$)+jets, diboson/triboson, multijet). The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit described in Section 6. The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 02c
Kinematic distributions of data and SM background for events that pass the preselection and have at least two hadronically decaying $\tau$-leptons. Predictions from three signal models are also shown, where the masses $m(\tilde b)$ and $m(\tilde\chi_2^0)$ are given in GeV in the legend. Distributions are displayed for the (a) $H$T, (b) $m(\tau_1, \tau_2)$ and (c) $m_{\mathrm{T2}}$ variables. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\tau\tau$)+jets, diboson/triboson, multijet). The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit described in Section 6. The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 03a
Schematic representation of the control region setup that is used to constrain the normalization of the (a) top-quark and (b) Z($\tau\tau$)+jets backgrounds in the signal regions. The arrows represent the transfer factors associated with the replacement of muons with true $\tau$-leptons, which correct for acceptance. For the top-quark background, the sketch illustrates the normalization strategy for the $\tau_\mathrm{true}\tau_\mathrm{true}$ contribution. A similar strategy is employed for the $\tau_\mathrm{true}\tau_\mathrm{fake}$ contribution, where the $\tau_\mathrm{fake}$ can originate from a jet from a hadronically decaying W boson, a $b$-jet, or a jet from initial-state radiation.
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Figure 03b
Schematic representation of the control region setup that is used to constrain the normalization of the (a) top-quark and (b) Z($\tau\tau$)+jets backgrounds in the signal regions. The arrows represent the transfer factors associated with the replacement of muons with true $\tau$-leptons, which correct for acceptance. For the top-quark background, the sketch illustrates the normalization strategy for the $\tau_\mathrm{true}\tau_\mathrm{true}$ contribution. A similar strategy is employed for the $\tau_\mathrm{true}\tau_\mathrm{fake}$ contribution, where the $\tau_\mathrm{fake}$ can originate from a jet from a hadronically decaying W boson, a $b$-jet, or a jet from initial-state radiation.
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Figure 04a
Kinematic distributions from the four control regions associated with the top-quark background, showing (a) $E_\mathrm{T}^\mathrm{miss}$ in CR_Top_μ$\tau_\mathrm{true}$, (b) $p_\mathrm{T}(\tau)$ in CR_Top_μ$\tau_\mathrm{fake}$, (c) $p_\mathrm{T}(\mathrm{jet_1})$ in CR_Top_μ, and (d) $m_\mathrm{T}^\tau$ in CR_Top_$\tau_\mathrm{true}$. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets, tt̄X, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 04b
Kinematic distributions from the four control regions associated with the top-quark background, showing (a) $E_\mathrm{T}^\mathrm{miss}$ in CR_Top_μ$\tau_\mathrm{true}$, (b) $p_\mathrm{T}(\tau)$ in CR_Top_μ$\tau_\mathrm{fake}$, (c) $p_\mathrm{T}(\mathrm{jet_1})$ in CR_Top_μ, and (d) $m_\mathrm{T}^\tau$ in CR_Top_$\tau_\mathrm{true}$. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets, tt̄X, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 04c
Kinematic distributions from the four control regions associated with the top-quark background, showing (a) $E_\mathrm{T}^\mathrm{miss}$ in CR_Top_μ$\tau_\mathrm{true}$, (b) $p_\mathrm{T}(\tau)$ in CR_Top_μ$\tau_\mathrm{fake}$, (c) $p_\mathrm{T}(\mathrm{jet_1})$ in CR_Top_μ, and (d) $m_\mathrm{T}^\tau$ in CR_Top_$\tau_\mathrm{true}$. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets, tt̄X, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 04d
Kinematic distributions from the four control regions associated with the top-quark background, showing (a) $E_\mathrm{T}^\mathrm{miss}$ in CR_Top_μ$\tau_\mathrm{true}$, (b) $p_\mathrm{T}(\tau)$ in CR_Top_μ$\tau_\mathrm{fake}$, (c) $p_\mathrm{T}(\mathrm{jet_1})$ in CR_Top_μ, and (d) $m_\mathrm{T}^\tau$ in CR_Top_$\tau_\mathrm{true}$. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets, tt̄X, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 05
The upper panel shows the expected number of SM background events and the number of events observed in data for each of the four validation regions. In the lower panel, the significance of the deviation of the observed yield from the expected yield is shown. The top-quark, Z($\tau\tau$) and Z($\mu\mu$) background contributions are scaled with the normalization factors obtained from the background-only fit described in Section 6. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\mu\mu$)+jets, tt̄X, diboson/triboson, multijet).
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Figure 06a
Kinematic distributions from the four validation regions, showing (a) Θmin in VR_Top_$\tau\tau$, (b) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{fake}}$, (c) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{true}}$, (d) Θmin in VR_Top_μ$\tau_{\mathrm{true}}$, (e) $p$T(μ1,μ2) in VR_Z_μμ2b, (f) $H$T in VR_Z_μμ2b. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The “Other” contribution includes all the backgrounds not explicitly listed in the legend (V+jets, $t\bar{t}X$, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 06
Kinematic distribution of the Θmin variable in the VR_Top_$\tau\tau$ region. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\tau\tau$)+jets, diboson/triboson, multijet). The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 06b
Kinematic distributions from the four validation regions, showing (a) Θmin in VR_Top_$\tau\tau$, (b) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{fake}}$, (c) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{true}}$, (d) Θmin in VR_Top_μ$\tau_{\mathrm{true}}$, (e) $p$T(μ1,μ2) in VR_Z_μμ2b, (f) $H$T in VR_Z_μμ2b. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The “Other” contribution includes all the backgrounds not explicitly listed in the legend (V+jets, $t\bar{t}X$, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 06c
Kinematic distributions from the four validation regions, showing (a) Θmin in VR_Top_$\tau\tau$, (b) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{fake}}$, (c) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{true}}$, (d) Θmin in VR_Top_μ$\tau_{\mathrm{true}}$, (e) $p$T(μ1,μ2) in VR_Z_μμ2b, (f) $H$T in VR_Z_μμ2b. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The “Other” contribution includes all the backgrounds not explicitly listed in the legend (V+jets, $t\bar{t}X$, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 06d
Kinematic distributions from the four validation regions, showing (a) Θmin in VR_Top_$\tau\tau$, (b) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{fake}}$, (c) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{true}}$, (d) Θmin in VR_Top_μ$\tau_{\mathrm{true}}$, (e) $p$T(μ1,μ2) in VR_Z_μμ2b, (f) $H$T in VR_Z_μμ2b. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The “Other” contribution includes all the backgrounds not explicitly listed in the legend (V+jets, $t\bar{t}X$, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 06e
Kinematic distributions from the four validation regions, showing (a) Θmin in VR_Top_$\tau\tau$, (b) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{fake}}$, (c) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{true}}$, (d) Θmin in VR_Top_μ$\tau_{\mathrm{true}}$, (e) $p$T(μ1,μ2) in VR_Z_μμ2b, (f) $H$T in VR_Z_μμ2b. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The “Other” contribution includes all the backgrounds not explicitly listed in the legend (V+jets, $t\bar{t}X$, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 06f
Kinematic distributions from the four validation regions, showing (a) Θmin in VR_Top_$\tau\tau$, (b) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{fake}}$, (c) $m_{\mathrm{T2}}$ in VR_Top_μ$\tau_{\mathrm{true}}$, (d) Θmin in VR_Top_μ$\tau_{\mathrm{true}}$, (e) $p$T(μ1,μ2) in VR_Z_μμ2b, (f) $H$T in VR_Z_μμ2b. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The “Other” contribution includes all the backgrounds not explicitly listed in the legend (V+jets, $t\bar{t}X$, diboson/triboson, multijet). The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 07
Comparison of the expected and observed event yields in the signal regions defined in Table 2. The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\tau\tau$)+jets, diboson/triboson, multijet). The hatched band indicates the total statistical and systematic uncertainty of the SM background. The contributions from three signal models to the signal regions are also displayed, where the masses $m(\tilde b)$ and $m(\tilde\chi_2^0)$ are given in GeV in the legend. The lower panel shows the significance of the deviation of the observed yield from the expected background yield.
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Figure 08
Exclusion contours at the 95% CL as a function of $m(\tilde b)$ and $m(\tilde\chi_2^0)$, assuming $\Delta m(\tilde \chi_2^0,\tilde \chi_1^0)$ = 130 GeV. Observed and expected limits are shown for the present search that requires hadronically decaying $\tau$-leptons, $b$-jets and $E_\mathrm{T}^\mathrm{miss}$ in the final state. The observed exclusion limit from a previous ATLAS search [22] that requires $b$-jets and $E_\mathrm{T}^\mathrm{miss}$ in the final state is also displayed. The region $m(\tilde b)$ < 400 GeV is excluded by a previous search from CMS [23].
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Tables
Table 01
Summary of the common analysis preselection. The requirements in the upper part of the table apply to all analysis regions, those in the lower part of the table to all but the Z($\tau\tau$) control regions as discussed in Section 6.
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Table 02
Definition of the single-bin and multi-bin signal regions. The requirements are applied in addition to the preselection from Table 1. The single-bin and multi-bin SRs only differ by the Θmin requirement.
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Table 03
Definition of the control regions used for the top-quark background. The requirements are applied in addition to the preselection. A dash means that no requirement on this variable is applied.
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Table 04
Definition of the control regions used for the Z+jets background. The requirements are applied in addition to the set of preselection criteria reported in the upper part of Table 1. A dash means that no requirement on this variable is applied.
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Table 05
Values of normalization and transfer factors with their statistical and systematic uncertainties as obtained from the background-only fit, in the top part of the table for top-quark background processes, and in the bottom part for Z+jets. The control regions that primarily affect the normalization factors are listed, together with the purity of the CR in the relevant background process. As TFTop and TFZ are ratios of two normalization factors, one of which (the denominator) is listed in the row directly above, the table lists the respective second control region (the numerator of the ratio) and its purity in top-quark or Z($\tau\tau$) + $b\bar b$ events.
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Table 06
Dominant systematic uncertainties in the background prediction for the signal regions after the fit to the control regions. "Other" includes the uncertainties arising from muons, jet-vertex tagging, modeling of pileup, the $E_\mathrm{T}^\mathrm{miss}$ computation, multijet background, and luminosity. The individual uncertainties can be correlated and do not necessarily add in quadrature to equal the total uncertainty.
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Table 07
The observed event yields in data, the total expected yields from SM processes obtained from the background-only fit and breakdown of individual contributions, and the expected signal contributions for three benchmark models are shown for the single-bin signal region and the three bins of the multi-bin signal region. Total uncertainties combining the statistical and systematic uncertainties are quoted for the background processes. For the signal, the quoted uncertainties are only statistical. "Other" combines all SM background contributions that are not listed explicitly, covering V+jets except for Z($\tau\tau$)+jets, multijet, diboson and triboson contributions. The dash means that no events pass the selection.
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Table 08
Upper limits at 95% CL on the visible cross section $\sigma_\mathrm{vis}$, on the number of signal events ($S_\mathrm{obs}^{95}$), and on number of signal events given the expected number (and ± 1σ excursions of the expectation) of background events ($S_\mathrm{exp}^{95}$). The last two columns indicate the CLb value, i.e. the confidence level observed for the background-only hypothesis, the discovery $p$-value ($p(s = 0)$), and its associated significance Z.
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Auxiliary material
Figure 01
Expected and observed exclusion contours at the 95% CL as a function of $m(\tilde b)$ and $m(\tilde \chi_2^0)$, assuming $\Delta m(\tilde\chi_2^0 , \tilde\chi_1^0)$ = 130 GeV. Results are shown for the present search that requires hadronically decaying $\tau$-leptons, $b$-jets and $E_\mathrm{T}^\mathrm{miss}$ in the final state. The grey numbers give the upper limit on the signal cross section for each tested mass-parameter hypothesis for the underlying simplified model.
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Figure 02
Expected and observed exclusion contours at the 95% CL as a function of $m(\tilde b)$ and $m(\tilde\chi_2^0)$, assuming $\Delta m(\tilde\chi_2^0, \tilde\chi_1^0)$ = 130 GeV. Results are shown for the present search that requires hadronically decaying $\tau$-leptons, $b$-jets and $E_\mathrm{T}^\mathrm{miss}$ in the final state. The grey numbers give the expected upper limit on the signal cross section for each tested mass-parameter hypothesis for the underlying simplified model.
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Figure 03
Expected and observed exclusion contours at the 95% CL as function of $m(\tilde b)$ and $m(\tilde\chi_2^0)$, assuming $\Delta m(\tilde\chi_2^0, \tilde\chi_1^0)$ = 130 GeV. Results are shown for the present search that requires hadronically decaying $\tau$-leptons, $b$-jets and $E_\mathrm{T}^\mathrm{miss}$ in the final state.
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Figure 04a
Schematic representation of the Θmin variable in a tt̄ event with two hadronically decaying $\tau$-leptons (blue) and two $b$-jets (red). The dashed grey lines are the neutrinos. The left image shows the decay chain, the right image the four angles Θi for all combinations of $b$-jets and $\tau$-leptons of which Θmin is the minimum. The angles Θi are depicted here as all lying in the same plane, but they are actually defined between the 3-dimensional momentum vectors.
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Figure 04b
Schematic representation of the Θmin variable in a tt̄ event with two hadronically decaying $\tau$-leptons (blue) and two $b$-jets (red). The dashed grey lines are the neutrinos. The left image shows the decay chain, the right image the four angles Θi for all combinations of $b$-jets and $\tau$-leptons of which Θmin is the minimum. The angles Θi are depicted here as all lying in the same plane, but they are actually defined between the 3-dimensional momentum vectors.
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Figure 05
Distribution of $E_\mathrm{T}^\mathrm{miss}$ in the multijet-enriched selection. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background. The "Other" contribution includes top-quark production, V+jets, di-/tribosons and tt̄X. The discontinuity at 200 GeV is due to the transition from the combined $b$-jet-plus-$E_\mathrm{T}^\mathrm{miss}$ trigger to the $E_\mathrm{T}^\mathrm{miss}$ trigger, which has a higher selection efficiency in this regime. Except for this multijet-enriched selection, the multijet background is found to be negligible in all analysis selections. This selection is therefore not part of the fit.
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Figure 06
Distribution of Θmin for events that pass the preselection and have at least two hadronically decaying $\tau$-leptons. Predictions from three signal models are shown in addition to the observed data and the expected SM background, with the masses of $\tilde b$ and $\tilde\chi_2^0$ given in GeV in the legend. The hatched band indicates the total statistical and systematic uncertainty of the SM background. The "Other" contribution includes all the backgrounds not explicitly listed in the legend (V+jets except Z($\tau\tau$)+jets, di-/triboson, multijet). The top-quark and Z($\tau\tau$) background contributions are scaled with the normalization factors obtained from the background-only fit described in Section 6. The rightmost bin includes the overflow. The bottom panel shows the ratio of the observed data and the expected Standard Model background.
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Figure 08a
Acceptance (top) and efficiency (bottom) of the bin Θmin < 0.5 of the multi-bin SR.
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Figure 08b
Acceptance (top) and efficiency (bottom) of the bin Θmin < 0.5 of the multi-bin SR.
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Figure 09a
Acceptance (top) and efficiency (bottom) of the bin 0.5 < Θmin < 1.0 of the multi-bin SR.
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Figure 09b
Acceptance (top) and efficiency (bottom) of the bin 0.5 < Θmin < 1.0 of the multi-bin SR.
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Figure 10a
Acceptance (top) and efficiency (bottom) of the bin Θmin > 1.0 of the multi-bin SR.
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Figure 10b
Acceptance (top) and efficiency (bottom) of the bin Θmin > 1.0 of the multi-bin SR.
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Table 01
Cutflow for the benchmark signal model ($m(\tilde b), m(\tilde\chi_2^0)$) = (800,180) GeV. The simulated sample contains 30000 raw MC events after the generator filters are applied, which is equivalent to 152130 raw MC events before the generator filters. Weighted event yields are reported, normalized to an integrated luminosity of 139 fb-1.
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Table 02
The observed event yields in data and the total expected yields from SM processes and breakdown of individual contributions are shown for the three bins of the multi-bin signal regions after the fit. The fit configuration is that of an exclusion fit with a signal strength set to 0, which is equivalent to a background-only fit with SRs treated as CRs. Total uncertainties combining the statistical and systematic uncertainties are quoted for the background processes. The row "other" combines all SM background contributions that are not listed explicitly, covering V+jets except for Z($\tau\tau$)+jets, multijet, diboson and triboson contributions. The dash means that no events pass the selection.
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