Abstract
Many new physics models, including versions of supersymmetry characterized by $R$-parity violation (RPV), compressed mass spectra, long decay chains, or additional hidden sectors, predict the production of events with top quarks, low missing transverse momentum, and many additional quarks or gluons. The results of a search for new physics in events with two top quarks and additional jets are reported. The search is performed using events with at least seven jets and exactly one electron or muon. No requirement on missing transverse momentum is imposed. The study is based on a sample of proton-proton collisions at $\sqrt{s} =$ 13 TeV corresponding to 137 fb$^{-1}$ of integrated luminosity collected with the CMS detector at the LHC in 2016-2018. The data are used to determine best fit values and upper limits on the cross section for pair production of top squarks in scenarios of RPV and stealth supersymmetry. Top squark masses up to 670 (870) GeV are excluded at 95% confidence level for the RPV (stealth) scenario, and the maximum observed local signal significance is 2.8 standard deviations for the RPV scenario with top squark mass of 400 GeV.
Highlights
Supersymmetry [1,2] (SUSY) is an extension of the standard model (SM) that may provide a solution to the gauge hierarchy problem [3]
Most searches for thet look for an excess of events with large missing transverse momentum pmT iss originating from the undetected lightest SUSY particle (LSP) produced int decays
We describe a search fort pair production followed by the decay of eacht into a top quark and three light-flavor jets via the benchmark R-parity violating (RPV) and stealth SYYmodels described above
Summary
Supersymmetry [1,2] (SUSY) is an extension of the standard model (SM) that may provide a solution to the gauge hierarchy problem [3]. Models of R-parity violating (RPV) SUSY produce lowpmT iss signatures by providing a mechanism for the LSP, in this case χ01, to decay. We describe a search fort pair production followed by the decay of eacht into a top quark and three light-flavor jets via the benchmark RPV and stealth SYYmodels described above. This is the first search of its kind at the LHC. Previous searches for stealth SUSY targeted superpartners of light-flavor quarks with decays into gauge bosons and jets [31,32].
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