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Search for supersymmetry in proton-proton collisions at $\sqrt{s} =$ 13 TeV in events with high-momentum Z bosons and missing transverse momentum

The CMS collaboration
JHEP 09 (2020) 149, 2020.

Abstract (data abstract)
A search for new physics in events with two highly Lorentz-boosted Z bosons and large missing transverse momentum is presented. The analyzed proton-proton collision data, corresponding to an integrated luminosity of 137 fb$^{-1}$, were recorded at $\sqrt{s}=13$ TeV by the CMS experiment at the CERN LHC. The search utilizes the substructure of jets with large radius to identify quark pairs from Z boson decays. Backgrounds from standard model processes are suppressed by requirements on the jet mass and the missing transverse momentum. No significant excess in the event yield is observed beyond the number of background events expected from the standard model. For a simplified supersymmetric model in which the Z bosons arise from the decay of gluinos, an exclusion limit of 1920 GeV on the gluino mass is set at $95\%$ confidence level. This is the first search for beyond-standard-model production of pairs of boosted Z bosons plus large missing transverse momentum.

  • Observed $\sigma$ UL

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t1

    Cross section upper limit vs m(GLUINO) for SMS model T5ZZ.

  • Expected $\sigma$ UL

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t2

    Cross section upper limit vs m(GLUINO) for SMS model T5ZZ.

  • Expected $\sigma$ UL + 1 s.d.

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t3

    Cross section upper limit vs m(GLUINO) for SMS model T5ZZ.

  • Expected $\sigma$ UL - 1 s.d.

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t4

    Cross section upper limit vs m(GLUINO) for SMS model T5ZZ.

  • Expected $\sigma$ UL + 2 s.d.

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t5

    Cross section upper limit vs m(GLUINO) for SMS model T5ZZ.

  • Expected - 2 s.d.

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t6

    Cross section upper limit vs m(GLUINO) for SMS model T5ZZ.

  • Theory $\sigma$

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t7

    Cross section vs m(GLUINO) for SMS model T5ZZ.

  • Theory $\sigma$ + 1 s.d.

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t8

    Cross section vs m(GLUINO) for SMS model T5ZZ.

  • Theory $\sigma$ - 1 s.d.

    Data from Figure 09.

    10.17182/hepdata.96235.v1/t9

    Cross section vs m(GLUINO) for SMS model T5ZZ.

  • Yields and background predictions

    Data from Table 2

    10.17182/hepdata.96235.v1/t10

    Number of events in the pTmiss CR, transfer factor, background prediction, and observed yield in each of the six pTmiss...

  • Covariance matrix

    Data from Additional Figure 1a.

    10.17182/hepdata.96235.v1/t11

    Pre-fit background covariance matrix $\sigma_{xy}$ for the 6 pTmiss bins.

  • Correlation matrix

    Data from Additional Figure 1b.

    10.17182/hepdata.96235.v1/t12

    Pre-fit background correlation matrix $\rho_{xy}$ for the 6 pTmiss bins.

  • Significance vs $m(\widetilde{g}$)

    Data from Additional Table 2

    10.17182/hepdata.96235.v1/t13

    Observed significance (in standard deviations) of the T5ZZ signal model as a function of the gluino mass.

  • Cut flow for Z boson candidate selection

    Data from Additional Table 4

    10.17182/hepdata.96235.v1/t14

    Cut flow for the signal for two example mass points of the T5ZZ signal model. Here the hadronic baseline is...

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