CMS-PAS-SUS-21-002

CMS-PAS-SUS-21-002
Search for electroweak production of supersymmetric particles in final states containing hadronic decays of WW, WZ, or WH and missing transverse momentum
CMS Collaboration
August 2021

Abstract: Results are presented from a search for chargino-neutralino or chargino pair production via electroweak interactions. The results are based on a sample of $\sqrt{s}=$ 13 TeV proton-proton collisions from the LHC, recorded with the CMS detector and corresponding to an integrated luminosity of 137 fb $^{-1}$ . The search considers final states with large missing transverse momentum and pairs of hadronically decaying bosons WW, WZ, and WH, which are identified using novel algorithms. No significant excess of events is observed relative to the expectation from the standard model. Limits at the 95% confidence level are placed on the cross section for production of mass-degenerate wino-like superpartners of SU(2) gauge bosons, $\tilde{\chi}_{1}^{\pm}$ / $\tilde{\chi}_{2}^{0}$ . In the limit of nearly-massless neutralinos $\tilde{\chi}_{1}^{0}$ , $\tilde{\chi}_{1}^{\pm}$ / $\tilde{\chi}_{2}^{0}$ with masses up to 870 and 960 GeV are excluded in the cases of $\tilde{\chi}_{2}^{0}\to\mathrm{Z}\tilde{\chi}_{1}^{0}$ and $\tilde{\chi}_{2}^{0}\to\mathrm{H}\tilde{\chi}_{1}^{0}$ , respectively. Interpretations for other models are also presented.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB.

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Production of ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ with the $\tilde{\chi}^{\pm}_1$ decaying to a W boson and $\tilde{\chi}^0_1$ and the $\tilde{\chi}^{0}_2$ decaying to either a Z boson or a Higgs boson and $\tilde{\chi}^0_1$ .
png pdf	Figure 1-a: Production of ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ with the $\tilde{\chi}^{\pm}_1$ decaying to a W boson and $\tilde{\chi}^0_1$ and the $\tilde{\chi}^{0}_2$ decaying to either a Z boson or a Higgs boson and $\tilde{\chi}^0_1$ .
png pdf	Figure 1-b: Production of ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ with the $\tilde{\chi}^{\pm}_1$ decaying to a W boson and $\tilde{\chi}^0_1$ and the $\tilde{\chi}^{0}_2$ decaying to either a Z boson or a Higgs boson and $\tilde{\chi}^0_1$ .
png pdf	Figure 2: Distributions of the jet mass for V-tagged AK8 jets in the b-veto SR (left) and ${\mathrm{b} \mathrm{\bar{b}}}$ -tagged AK8 jets in the WH SR (right). The jet mass requirements for the V and ${\mathrm{b} \mathrm{\bar{b}}}$ taggers have been loosened in these figures. The filled histograms show the SM background predictions. The open histograms show the SM background predictions plus the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 2-a: Distributions of the jet mass for V-tagged AK8 jets in the b-veto SR (left) and ${\mathrm{b} \mathrm{\bar{b}}}$ -tagged AK8 jets in the WH SR (right). The jet mass requirements for the V and ${\mathrm{b} \mathrm{\bar{b}}}$ taggers have been loosened in these figures. The filled histograms show the SM background predictions. The open histograms show the SM background predictions plus the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 2-b: Distributions of the jet mass for V-tagged AK8 jets in the b-veto SR (left) and ${\mathrm{b} \mathrm{\bar{b}}}$ -tagged AK8 jets in the WH SR (right). The jet mass requirements for the V and ${\mathrm{b} \mathrm{\bar{b}}}$ taggers have been loosened in these figures. The filled histograms show the SM background predictions. The open histograms show the SM background predictions plus the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 3: Prediction vs. data in the b-veto SR (upper left), the WH SR (upper right), the W SR (lower left), and the H SR (lower right). The filled histograms show the SM background predictions, and the open histograms show the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 3-a: Prediction vs. data in the b-veto SR (upper left), the WH SR (upper right), the W SR (lower left), and the H SR (lower right). The filled histograms show the SM background predictions, and the open histograms show the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 3-b: Prediction vs. data in the b-veto SR (upper left), the WH SR (upper right), the W SR (lower left), and the H SR (lower right). The filled histograms show the SM background predictions, and the open histograms show the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 3-c: Prediction vs. data in the b-veto SR (upper left), the WH SR (upper right), the W SR (lower left), and the H SR (lower right). The filled histograms show the SM background predictions, and the open histograms show the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 3-d: Prediction vs. data in the b-veto SR (upper left), the WH SR (upper right), the W SR (lower left), and the H SR (lower right). The filled histograms show the SM background predictions, and the open histograms show the expectations for selected signal models, which are denoted in the legend by the name of the model followed by the assumed masses of the NLSP and LSP. The observed event yields are indicated by black markers.
png pdf	Figure 4: Expected and observed 95% CL upper limits on the production cross section for ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ production assuming they each decay to a W boson (upper left) and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ production assuming they decay to a W boson and a Z boson (upper right) or to a W boson and a H boson (lower left and lower right). In the upper plots and the lower left plot, the red (black) contours represent the expected (observed) mass exclusion limits. Mass exclusion limits are computed assuming wino-like cross sections. In the lower right plot the $\tilde{\chi}^0_1$ mass is assumed to be 1 GeV and the red and blue curves correspond to wino-like and higgsino-like production cross sections, respectively. For the higgsino cross section curve, $\tilde{\chi}^{\pm}_1$ , $\tilde{\chi}^{0}_2$ , and $\tilde{\chi}^{0}_3$ are considered mass degenerate with an effective cross section equal to the sum of the ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_3}$ cross sections.
png pdf	Figure 4-a: Expected and observed 95% CL upper limits on the production cross section for ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ production assuming they each decay to a W boson (upper left) and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ production assuming they decay to a W boson and a Z boson (upper right) or to a W boson and a H boson (lower left and lower right). In the upper plots and the lower left plot, the red (black) contours represent the expected (observed) mass exclusion limits. Mass exclusion limits are computed assuming wino-like cross sections. In the lower right plot the $\tilde{\chi}^0_1$ mass is assumed to be 1 GeV and the red and blue curves correspond to wino-like and higgsino-like production cross sections, respectively. For the higgsino cross section curve, $\tilde{\chi}^{\pm}_1$ , $\tilde{\chi}^{0}_2$ , and $\tilde{\chi}^{0}_3$ are considered mass degenerate with an effective cross section equal to the sum of the ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_3}$ cross sections.
png pdf	Figure 4-b: Expected and observed 95% CL upper limits on the production cross section for ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ production assuming they each decay to a W boson (upper left) and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ production assuming they decay to a W boson and a Z boson (upper right) or to a W boson and a H boson (lower left and lower right). In the upper plots and the lower left plot, the red (black) contours represent the expected (observed) mass exclusion limits. Mass exclusion limits are computed assuming wino-like cross sections. In the lower right plot the $\tilde{\chi}^0_1$ mass is assumed to be 1 GeV and the red and blue curves correspond to wino-like and higgsino-like production cross sections, respectively. For the higgsino cross section curve, $\tilde{\chi}^{\pm}_1$ , $\tilde{\chi}^{0}_2$ , and $\tilde{\chi}^{0}_3$ are considered mass degenerate with an effective cross section equal to the sum of the ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_3}$ cross sections.
png pdf	Figure 4-c: Expected and observed 95% CL upper limits on the production cross section for ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ production assuming they each decay to a W boson (upper left) and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ production assuming they decay to a W boson and a Z boson (upper right) or to a W boson and a H boson (lower left and lower right). In the upper plots and the lower left plot, the red (black) contours represent the expected (observed) mass exclusion limits. Mass exclusion limits are computed assuming wino-like cross sections. In the lower right plot the $\tilde{\chi}^0_1$ mass is assumed to be 1 GeV and the red and blue curves correspond to wino-like and higgsino-like production cross sections, respectively. For the higgsino cross section curve, $\tilde{\chi}^{\pm}_1$ , $\tilde{\chi}^{0}_2$ , and $\tilde{\chi}^{0}_3$ are considered mass degenerate with an effective cross section equal to the sum of the ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_3}$ cross sections.
png pdf	Figure 4-d: Expected and observed 95% CL upper limits on the production cross section for ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ production assuming they each decay to a W boson (upper left) and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ production assuming they decay to a W boson and a Z boson (upper right) or to a W boson and a H boson (lower left and lower right). In the upper plots and the lower left plot, the red (black) contours represent the expected (observed) mass exclusion limits. Mass exclusion limits are computed assuming wino-like cross sections. In the lower right plot the $\tilde{\chi}^0_1$ mass is assumed to be 1 GeV and the red and blue curves correspond to wino-like and higgsino-like production cross sections, respectively. For the higgsino cross section curve, $\tilde{\chi}^{\pm}_1$ , $\tilde{\chi}^{0}_2$ , and $\tilde{\chi}^{0}_3$ are considered mass degenerate with an effective cross section equal to the sum of the ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_3}$ cross sections.
png pdf	Figure 5: Expected and observed 95% CL exclusion for mass-degenerate wino-like ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{\mp}_1 }$ and ${\tilde{\chi}^{\pm}_1 \tilde{\chi}^{0}_2}$ production as a function of NLSP and LSP masses.

Tables
png pdf	Table 1: Summary of tagging requirements for the b-veto SR and CRs. Each of these regions includes the baseline requirements described in Section xxxxx, as well as requiring zero b-tagged AK4 jets and requiring at least two AK8 jets satisfying 65 $< {m_{\text {J}}} <$ 105 GeV. The SR and CRs are described in detail in Sections uuuuu and vvvvv, respectively. The W and V taggers are described in Section ttttt.
png pdf	Table 2: Summary of tagging requirements for the b-tag SRs and CRs. Each of these regions includes the baseline requirements described in Section xxxxx, as well as requiring at least one b-tagged AK4 jet and at least two AK8 jets. The SRs and CRs are described in detail in Sections yyyyy and zzzzz, respectively. The ${\mathrm{b} \mathrm{\bar{b}}}$ and W taggers are described in Section ttttt, and the definitions of W and Higgs boson candidates are given in Section yyyyy. In addition to the six regions described in this table, the b-tag predictions also use six single-lepton CRs that are identical except that exactly one charged lepton is required. A dash (--) indicates that no requirement is imposed.
png pdf	Table 3: Summary of the dominant systematic uncertainties (in %) in various analysis regions. For the 0- and 1-res backgrounds in the b-veto SR, uncertainties are presented separately depending on the CR region used for the estimation. A dash (--) indicates that the source of uncertainty is not applicable.

Summary

A search is presented for signatures of electroweak production of supersymmetry in which a pair of charginos (

$\tilde{\chi}^{\pm}_1$ pair) or a chargino and a neutralino (

${\tilde{\chi}^{\pm}_1\tilde{\chi}^{0}_2}$ ) are produced. The chargino

$\tilde{\chi}^{\pm}_1$ is assumed to decay to the W boson and the lightest neutralino

$\tilde{\chi}^0_1$ , and the neutralino

$\tilde{\chi}^{0}_2$ is assumed to decay to either the Z or Higgs boson and

$\tilde{\chi}^0_1$ . The decay products of W, Z, or Higgs bosons are clustered into large-radius jets. These jets are categorized based on their mass and a collection of novel jet-tagging algorithms based on deep neural networks. Four signal regions are constructed to look for

$\tilde{\chi}^{\pm}_1$ pair or

${\tilde{\chi}^{\pm}_1\tilde{\chi}^{0}_2}$ production signals with a pair of W bosons, a pair of W and Z bosons, or a pair of W and Higgs bosons, together with a large transverse momentum imbalance in the final state. In these simplified models, the charginos

$\tilde{\chi}^{\pm}_1$ and the next-to-lightest neutralino

$\tilde{\chi}^{0}_2$ are assumed to be mass-degenerate next-to-lightest supersymmetric particles (NLSP), and the lightest neutralino

$\tilde{\chi}^0_1$ is assumed to be bino-like and to be the lightest supersymmetric particle (LSP). No statistically significant excess of events is observed in the data with respect to the expectation from the standard model.

Using wino-like pair production cross sections, 95% confidence level (CL) mass exclusions are derived. For signals with WW, WZ, or WH final states, the NLSP mass exclusion limit for low-mass LSPs extends up to 670, 760, and 970 GeV, respectively. When we consider models including both wino-like NLSP

${\tilde{\chi}^{\pm}_1\tilde{\chi}^{0}_2}$ and

$\tilde{\chi}^{\pm}_1$ pair production with either

$\tilde{\chi}^{0}_2\to\mathrm{Z}\tilde{\chi}^0_1$ or

$\tilde{\chi}^{0}_2\to\mathrm{H}\tilde{\chi}^0_1$ , the NLSP mass exclusion extends up to 870 and 960 GeV, respectively. These mass exclusions are the most stringent constraints to date set by CMS at high NLSP masses. Results are also shown using the higgsino-like chargino-neutralino pair production cross section for signal events with a WH pair in the final state. NLSP masses between 325 and 850 GeV are expected to be excluded at 95% CL under the standard model hypothesis; however, the observed cross section upper limits lie mostly below the theoretical cross section because of a modest excess in data.

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