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| CMS-SUS-21-008 ; CERN-EP-2024-000 | ||
| Combined search for electroweak production of winos, binos, higgsinos, and sleptons in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 3 February 2024 | ||
| Accepted for publication in Phys. Rev. D | ||
| Abstract: A combination of the results of several searches for the electroweak production of the supersymmetric partners of standard model bosons, and of charged leptons, is presented. All searches use proton-proton collision data at $ \sqrt{s}= $ 13 TeV recorded with the CMS detector at the LHC in 2016-2018. The analyzed data correspond to an integrated luminosity of up to 137 fb$ ^{-1} $. The results are interpreted in terms of simplified models of supersymmetry. Two new interpretations are added with this combination: a model spectrum with the bino as the lightest supersymmetric particle together with mass-degenerate higgsinos decaying to the bino and a standard model boson, and the compressed-spectrum region of a previously studied model of slepton pair production. Improved analysis techniques are employed to optimize sensitivity for the compressed spectra in the wino and slepton pair production models. The results are consistent with expectations from the standard model. The combination provides a more comprehensive coverage of the model parameter space than the individual searches, extending the exclusion by up to 125 GeV, and also targets some of the intermediate gaps in the mass coverage. | ||
| Links: e-print arXiv:2402.01888 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Wino-bino model: production of $ \tilde{\chi}_{2}^{0} $ and $ \tilde{\chi}_{1}^{\pm} $, with the $ \tilde{\chi}_{2}^{0} $ decaying to either a Z or H boson and a $ \tilde{\chi}_{1}^{0} $, and the $ \tilde{\chi}_{1}^{\pm} $ decaying to a W boson and a $ \tilde{\chi}_{1}^{0} $. |
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Figure 2:
GMSB model: pair production of $ \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} $. The $ \tilde{\chi}_{1}^{0} $ particles each decay to a $ \tilde{\mathrm{G}} $ with the emission of an SM gauge boson: (left) both Z, (middle) one Z and the other H, and (right) both H. Soft fermions from decays of nearly degenerate neutralinos and charginos are omitted from these diagrams. |
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Figure 2-a:
GMSB model: pair production of $ \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} $. The $ \tilde{\chi}_{1}^{0} $ particles each decay to a $ \tilde{\mathrm{G}} $ with the emission of two Z bosons. Soft fermions from decays of nearly degenerate neutralinos and charginos are omitted from the diagram. |
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Figure 2-b:
GMSB model: pair production of $ \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} $. The $ \tilde{\chi}_{1}^{0} $ particles each decay to a $ \tilde{\mathrm{G}} $ with the emission of one Z boson and one H boson. Soft fermions from decays of nearly degenerate neutralinos and charginos are omitted from the diagram. |
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Figure 2-c:
GMSB model: pair production of $ \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} $. The $ \tilde{\chi}_{1}^{0} $ particles each decay to a $ \tilde{\mathrm{G}} $ with the emission of two H bosons. Soft fermions from decays of nearly degenerate neutralinos and charginos are omitted from the diagram. |
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Figure 3:
Higgsino-bino model: (left) the production of a pair of charginos followed by their decays to W bosons and the LSP, (middle) the production of a pair of neutralinos followed by decays to H bosons and the LSP, and (right) the production of chargino-neutralino pairs followed by decay of the chargino (neutralino) to a W (H) boson and the LSP. |
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Figure 3-a:
Higgsino-bino model: the production of a pair of charginos followed by their decays to W bosons and the LSP. |
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Figure 3-b:
Higgsino-bino model: the production of a pair of neutralinos followed by decays to H bosons and the LSP. |
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Figure 3-c:
Higgsino-bino model: the production of chargino-neutralino pairs followed by decay of the chargino (neutralino) to a W (H) boson and the LSP. |
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Figure 4:
Slepton-neutralino model: direct slepton pair production, with each slepton decaying into a lepton and a $ \tilde{\chi}_{1}^{0} $ LSP. |
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Figure 5:
``2/3$\ell $ soft'' search: dilepton mass spectrum for two mass hypotheses with the same NLSP mass (100 GeV) and different mass splittings $ \Delta m $ (40 or 10 GeV), both corresponding to analytical phase space only calculations. The distributions have a kinematic endpoint at the mass splitting. |
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Figure 6:
``2/3$\ell $ soft'' search: post-fit distributions of the $ \text{M}(\ell\ell) $ variable for the low- (upper left), medium- (upper right), high- (lower left), and ultrahigh- (lower right) $ p_{\mathrm{T}}^\text{miss} $ bins in the ``2$ \ell $ soft'' signal region of Ref. [72]. These distributions are based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 6-a:
``2/3$\ell $ soft'' search: post-fit distribution of the $ \text{M}(\ell\ell) $ variable for the low-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 6-b:
``2/3$\ell $ soft'' search: post-fit distribution of the $ \text{M}(\ell\ell) $ variable for the medium- $ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 6-c:
``2/3$\ell $ soft'' search: post-fit distribution of the $ \text{M}(\ell\ell) $ variable for the high-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 6-d:
``2/3$\ell $ soft'' search: post-fit distribution of the $ \text{M}(\ell\ell) $ variable for the ultrahigh-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 7:
``2/3$\ell $ soft'' search: post-fit distributions of the $ \text{M}^{\text{min}}_{\text{OSSF}}(\ell\ell) $ variable for the low- (left) and medium- (right) $ p_{\mathrm{T}}^\text{miss} $ bins in the ``3$ \ell $ soft'' signal region of Ref. [72]. These distributions are based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $ m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 7-a:
``2/3$\ell $ soft'' search: post-fit distribution of the $ \text{M}^{\text{min}}_{\text{OSSF}}(\ell\ell) $ variable for the low-$ p_{\mathrm{T}}^\text{miss} $ bins in the ``3$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $ m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 7-b:
``2/3$\ell $ soft'' search: post-fit distribution of the $ \text{M}^{\text{min}}_{\text{OSSF}}(\ell\ell) $ variable for the medium-$ p_{\mathrm{T}}^\text{miss} $ bins in the ``3$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for signal mass points with $ \Delta m = $ 20 GeV. The pre-fit signal distribution for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 200 GeV, $ m_{\tilde{\chi}^{0}}= $ 180 GeV is overlaid for illustration. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 8:
``2/3$\ell $ soft'' search: post-fit distributions of the $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $ variable are shown for the low- (upper left), medium- (upper right), high- (lower left), and ultrahigh- (lower right) $ p_{\mathrm{T}}^\text{miss} $ bins in the ``2$ \ell $ soft'' signal region of Ref. [72]. These distributions are based on the parametric binnings derived for the mass-point $ m_{\tilde{\ell} }=$ 125 GeV, $ m_{\tilde{\chi}^{0}}= $ 115 GeV, for which the pre-fit signal distribution is overlaid for illustration. Note that the signal distribution (purple line) is approximately flat across $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, by construction of the parametric binning procedure. The minimum value of $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, $ m_\chi = $ 100 GeV, is subtracted for the abscissa of the plot. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 8-a:
``2/3$\ell $ soft'' search: post-fit distribution of the $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $ variable are shown for the low-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for the mass-point $ m_{\tilde{\ell} }=$ 125 GeV, $ m_{\tilde{\chi}^{0}}= $ 115 GeV, for which the pre-fit signal distribution is overlaid for illustration. Note that the signal distribution (purple line) is approximately flat across $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, by construction of the parametric binning procedure. The minimum value of $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, $ m_\chi = $ 100 GeV, is subtracted for the abscissa of the plot. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 8-b:
``2/3$\ell $ soft'' search: post-fit distribution of the $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $ variable are shown for the medium-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for the mass-point $ m_{\tilde{\ell} }=$ 125 GeV, $ m_{\tilde{\chi}^{0}}= $ 115 GeV, for which the pre-fit signal distribution is overlaid for illustration. Note that the signal distribution (purple line) is approximately flat across $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, by construction of the parametric binning procedure. The minimum value of $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, $ m_\chi = $ 100 GeV, is subtracted for the abscissa of the plot. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 8-c:
``2/3$\ell $ soft'' search: post-fit distribution of the $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $ variable are shown for the high-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for the mass-point $ m_{\tilde{\ell} }=$ 125 GeV, $ m_{\tilde{\chi}^{0}}= $ 115 GeV, for which the pre-fit signal distribution is overlaid for illustration. Note that the signal distribution (purple line) is approximately flat across $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, by construction of the parametric binning procedure. The minimum value of $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, $ m_\chi = $ 100 GeV, is subtracted for the abscissa of the plot. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 8-d:
``2/3$\ell $ soft'' search: post-fit distribution of the $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $ variable are shown for the ultrahigh-$ p_{\mathrm{T}}^\text{miss} $ bin in the ``2$ \ell $ soft'' signal region of Ref. [72]. The distribution is based on the parametric binnings derived for the mass-point $ m_{\tilde{\ell} }=$ 125 GeV, $ m_{\tilde{\chi}^{0}}= $ 115 GeV, for which the pre-fit signal distribution is overlaid for illustration. Note that the signal distribution (purple line) is approximately flat across $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, by construction of the parametric binning procedure. The minimum value of $ m_{\mathrm{T2}}(\ell, \ell, \chi_{100}) $, $ m_\chi = $ 100 GeV, is subtracted for the abscissa of the plot. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 9:
``2SS$ \ell/{\geq}\,3\ell $" search: observed and expected event yields across the SRs in category A, events with three light leptons of which at least two form an OSSF pair, after the requirement that the leading-lepton $ p_{\mathrm{T}} $ be greater than 30 GeV is applied. The pre-fit signal distributions for three mass-points are overlaid for illustration, and the considered mass hypothesis is indicated in the legend with notation $ (m $ (NLSP) $ /m $ (LSP) $) $; for example (150/1) stands for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}=$ 150 GeV, $m_{\tilde{\chi}^{0}}= $ 1 GeV. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 10:
``2SS$ \ell/{\geq}\,3\ell $" search: observed and expected event yields across the SRs in category B, events with three light leptons and no OSSF pair, after the requirement that the leading-lepton $ p_{\mathrm{T}} $ be greater than 30 GeV is applied. The pre-fit signal distributions for two mass-points are overlaid for illustration, and the considered mass hypothesis is indicated in the legend with notation $ (m $ (NLSP) $ /m $ (LSP) $) $; for example (150/1) stands for $ m_{\tilde{\chi}_{1}^{\pm}} = m_{\tilde{\chi}_{2}^{0}}= $ 150 GeV, $ m_{\tilde{\chi}^{0}}= $ 1 GeV. ``Nonprompt'' refers to the background contribution arising from nonprompt or misidentified leptons. |
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Figure 11:
Wino-bino model: cross section limits with expected and observed exclusion boundaries in the model parameter space in the WZ topology for the full parameter space (upper left) as well as the compressed region (upper right), the WH topology (lower left), and the mixed topology with 50% branching fraction to WZ and WH (lower right). All masses below the contours are excluded, except in the case of the upper-right plot where the area on the left of the contour is excluded. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 11-a:
Wino-bino model: cross section limits with expected and observed exclusion boundaries in the model parameter space in the WZ topology for the full parameter space. All masses below the contours are excluded. For the signal region the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 11-b:
Wino-bino model: cross section limits with expected and observed exclusion boundaries in the model parameter space in the WZ topology for the compressed region. The area on the left of the contour is excluded. For the signal region the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 11-c:
Wino-bino model: cross section limits with expected and observed exclusion boundaries in the model parameter space in the WZ topology for the WH topology. All masses below the contours are excluded. |
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Figure 11-d:
Wino-bino model: cross section limits with expected and observed exclusion boundaries in the model parameter space in the WZ topology for the mixed topology with 50% branching fraction to WZ and WH. All masses below the contours are excluded. For the signal region the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 12:
Wino-bino model: exclusion contours from the individual analyses targeting the WZ topology for the full parameter space (upper left), the corresponding compressed region (upper right), and the WH topology (lower left). The combined contours for these two topologies are also shown. The combined contours for these and the mixed topology are overlaid in the lower-right plot. The decay modes assumed for each contour are given in the legends. All masses below the contours are excluded, except in the case of the upper-right plot where the area on the left of the contour is excluded. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 12-a:
Wino-bino model: exclusion contours from the individual analyses targeting the WZ topology for the full parameter space. All masses below the contours are excluded. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 12-b:
Wino-bino model: exclusion contours from the individual analyses targeting the WZ topology for the compressed region. The combined contour is also shown. The area on the left of the contour is excluded. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 12-c:
Wino-bino model: exclusion contours from the individual analyses targeting the WZ topology for the WH topology. The combined contour is also shown. All masses below the contours are excluded. |
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Figure 12-d:
Wino-bino model: combined exclusion contours for the WZ/WH topologies. The decay modes assumed for each contour are given in the legends. All masses below the contours are excluded. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. |
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Figure 13:
GMSB model: expected and observed exclusion limits for the ZZ topology (upper), the HH topology (middle), and the mixed topology with 50% branching fraction to H and Z (lower). All masses on the left of the crossing between the exclusion limits and theory prediction are excluded. |
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Figure 13-a:
GMSB model: expected and observed exclusion limits for the ZZ topology. All masses on the left of the crossing between the exclusion limits and theory prediction are excluded. |
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Figure 13-b:
GMSB model: expected and observed exclusion limits for the HH topology. All masses on the left of the crossing between the exclusion limits and theory prediction are excluded. |
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Figure 13-c:
GMSB model: expected and observed exclusion limits for the mixed topology with 50% branching fraction to H and Z. All masses on the left of the crossing between the exclusion limits and theory prediction are excluded. |
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Figure 14:
GMSB model: NLSP mass exclusion limit as a function of the branching fraction to the H boson. Left: expected and observed limits for the combination of the searches, shown together with the observed limits of the combination [52] based on the 2016 CMS data. Right: expected and observed exclusion limits for the combination in comparison with those of the input searches. All masses on the left of the contours are excluded. |
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Figure 14-a:
GMSB model: NLSP mass exclusion limit as a function of the branching fraction to the H boson. Expected and observed limits for the combination of the searches, shown together with the observed limits of the combination [52] based on the 2016 CMS data. |
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Figure 14-b:
GMSB model: NLSP mass exclusion limit as a function of the branching fraction to the H boson. Expected and observed exclusion limits for the combination in comparison with those of the input searches. All masses on the left of the contours are excluded. |
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Figure 15:
Higgsino-bino model: cross section upper limit in the mass plane of the model, and the expected and observed exclusion limits. The model assumes mass-degenerate higgsino-like $ \tilde{\chi}_{2}^{0} $, $ \tilde{\chi}_{3}^{0} $, and $ \tilde{\chi}_{1}^{\pm} $ that decay to a bino-like $ \tilde{\chi}_{1}^{0} $ and an SM boson. All masses below the contours are excluded. |
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Figure 16:
Slepton-neutralino model: mass plane cross section upper limit with observed and expected exclusion limits. Left: the full mass plane from the combination. Right: the compressed region, obtained by the ``2/3$\ell $ soft'' search. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. All masses below the contours are excluded, except in the case of the right figure where the area on the left of the contour is excluded. |
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Figure 16-a:
Slepton-neutralino model: mass plane cross section upper limit with observed and expected exclusion limits. The full mass plane from the combination. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. All masses below the contour are excluded. |
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Figure 16-b:
Slepton-neutralino model: mass plane cross section upper limit with observed and expected exclusion limits. The compressed region, obtained by the ``2/3$\ell $ soft'' search. For some signal regions the analysis was based on a subset of the data, corresponding to the integrated luminosity of 129 fb$ ^{-1} $. The area on the left of the contour is excluded. |
| Tables | |
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Table 1:
``2/3$\ell $ soft'' search: definition of the lepton multiplicity and $ p_{\mathrm{T}}^\text{miss, corr} $ SRs. The boundaries are indicated in GeVns. Events in the low-$ p_{\mathrm{T}}^\text{miss} $ SR must additionally have $ p_{\mathrm{T}}^\text{miss} > $ 125 GeV. |
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Table 2:
Summary of the searches considered in the combination and the SRs that contribute to the interpretation of each signal model and topology. The following abbreviations appear in the table: For the ``2$ \ell $ on-Z'' analysis, ``EW'' refers to the resolved and boosted VZ SRs and the HZ SR. The row label ``2$ \ell $ nonres.''\ refers to the ``2$ \ell $ nonresonant'' search, and in that row ``Slepton'' refers to the two dedicated slepton SRs, those requiring $ N_{\text{jet}}= $ 0 and $ N_{\text{jet}} > $ 0. For the ``2SS$ \ell/{\geq}\,3\ell $" search, ``A(NN)'' indicates SR A with the parametric neural network signal extraction. For the "Hadr. WX'', ``ex H'' means all SRs except the b-tag H SR. |
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Table 3:
Sources of systematic uncertainties and the treatment of their correlations between analyses. Exceptions to the notations in the last column are: for the ``SM background normalization'' row, the WZ normalization is correlated between the ``2SS$ \ell/{\geq}\,3\ell $" [73] and ``2/3$\ell $ soft'' [72] searches, and for the ``Lepton efficiency'' row the two contributing searches, ``2/3$\ell $ soft'' [72] and ``2$ \ell $ nonresonant'' [70], are uncorrelated because they cover disjoint regions of the model parameter space. |
| Summary |
| A number of previously reported searches for supersymmetry (SUSY) in different final states from proton-proton collisions at $ \sqrt{s}= $ 13 TeV have been reoptimized and combined. The data were recorded with the CMS detector at the LHC and correspond to an integrated luminosity of up to 137 fb$ ^{-1} $. These data are used to test the predictions of a variety of simplified SUSY models that involve the electroweak production of the superpartners of electroweak gauge or Higgs bosons. No significant deviation from the standard model expectation has been observed, and limits are set on the production of wino-like chargino-neutralino pairs, higgsino-like neutralino pair production in a gauge-mediated SUSY breaking inspired scenario, a higgsino-bino interpretation, and slepton pair production. In the case of wino-like chargino-neutralino production, for a $ \tilde{\chi}_{1}^{0} $, the lightest SUSY particle in this model, with mass $ m_{\tilde{\chi}_{1}^{\pm}} < $ 50 GeV, the combined result gives an observed (expected) limit on $ m_{\tilde{\chi}_{1}^{\pm}} $ of about 875 (950) GeV for the WZ topology, 990 (1075) GeV for the WH topology, and 875 (1000) GeV for a mixed topology, extending the previous CMS combination [52] (based on a 2016 data set corresponding to 36 fb$^{-1}$), by 225, 510, and 340 GeV, respectively, for the three topologies. For higgsino-like neutralino pair production, the mass exclusion limit is a function of the branching ratio between the H and Z channels; the expected limit ranges between about 620 and 950 GeV, the smaller value occurring for $ \mathcal{B}(\tilde{\chi}_{1}^{0} \to \mathrm{H}\tilde{\mathrm{G}}) \approx $ 0.4. For this value of the branching fraction, the observed limit results in the exclusion of masses below 750 GeV, and extends the previous result [52] by 100 GeV. The observed limit reaches nearly 1025 GeV at $ \mathcal{B}(\tilde{\chi}_{1}^{0} \to \mathrm{H}\tilde{\mathrm{G}}) = $ 1, to be compared with 750 GeV reported in Ref. [52]. A higgsino-bino model that assumes mass degenerate higgsino-like $ \tilde{\chi}_{2}^{0} $, $ \tilde{\chi}_{3}^{0} $, and $ \tilde{\chi}_{1}^{\pm} $ decaying to a bino-like $ \tilde{\chi}_{1}^{0} $ and a standard model boson is excluded for $ m_{\tilde{\chi}_{1}^{\pm}}=m_{\tilde{\chi}_{2}^{0}} $ between 225 and 800 GeV for $ m_{\tilde{\chi}_{1}^{0}} < $ 50 GeV. For direct production of the superpartners of electrons and muons (sleptons), this combined search yields an observed (expected) exclusion in the slepton mass of about 130-700 (110-720) GeV, for $ m_{\tilde{\chi}_{1}^{0}} < $ 50 GeV. In the compressed-spectrum region, a dedicated search first reported here excludes slepton masses above 215 GeV for a 5 GeV difference between the slepton and $ \tilde{\chi}_{1}^{0} $ masses. In general for the models considered in this combination, wino-like chargino masses are excluded up to 990 GeV, while higgsino-like neutralino masses are excluded up to 1025 GeV. The improvement is between 100-510 GeV with respect to the previous exclusion limits [52], whereas the excluded model parameter space is expanded by as much as 125 GeV, depending on the model, with respect to the best of the component searches. The compressed parameter space of the slepton production model is explored here for the first time by CMS. |
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