Search for supersymmetry in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV in events with
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Springer
Received: August 10, 2020 Accepted: August 21, 2020 Published: September 23, 2020
The CMS collaboration E-mail: [email protected] 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 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-standardmodel production of pairs of boosted Z bosons plus large missing transverse momentum. Keywords: Hadron-Hadron scattering (experiments), Supersymmetry ArXiv ePrint: 2008.04422
Open Access, Copyright CERN, for the benefit of the CMS Collaboration. 3 Article funded by SCOAP .
https://doi.org/10.1007/JHEP09(2020)149
JHEP09(2020)149
Search for supersymmetry in proton-proton collisions √ at s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum
Contents 1
2 The CMS detector and trigger
2
3 Simulated event samples
3
4 Event reconstruction
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5 Event selection
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6 Background estimation 6.1 Background estimation method 6.2 Background closure in simulation 6.3 The pmiss shape uncertainty T
7 8 9 10
7 Systematic uncertainties
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8 Results
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9 Summary
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The CMS collaboration
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1
Introduction
The discovery of a Higgs boson in 2012 by the ATLAS and CMS experiments [1–3] at the CERN LHC fulfilled the predicted particle content of the standard model (SM). However, within the SM as a quantum field theory, the measured Higgs boson mass of around 125 GeV presents a special challenge as the calculated mass is unstable against corrections from loop processes when the theory is extended to higher mass scales. In the absence of extreme fine tuning [4–7] that would precisely cancel the divergent terms, the mass value can run up to the ultraviolet cutoff of the model at the Planck scale. This instability of the Higgs boson mass and the entire electroweak scale is known as the gauge hierarchy problem. One widely studied extension of the SM is supersymmetry (SUSY) [8–10], which posits e a partner for each SM particle differing in spin by one-half unit. For example, squarks q and gluinos ge are the SUSY partners of quarks and gluons, respectively. Depending on the mass hierarchy of these new particles, they could resolve the gauge hierarchy problem by providing necessary radiative corrections to partly cancel the SM contributions. Furthermore, in R-parity conse
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