Search for top squarks in the four-body decay mode with single lepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for the pair production of the lightest supersymmetric partner of the top quark, the top squark (${\tilde{\mathrm{t}}}_1$), is presented. The search targets the four-body decay of the ${\tilde{\mathrm{t}}}_1$, which is preferred when the mass difference between the top squark and the lightest supersymmetric particle is smaller than the mass of the W boson. This decay mode consists of a bottom quark, two other fermions, and the lightest neutralino (${\tilde{\chi }}_1^0$), which is assumed to be the lightest supersymmetric particle. The data correspond to an integrated luminosity of 138 fb${}^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC. Events are selected using the presence of a high-momentum jet, an electron or muon with low transverse momentum, and a significant missing transverse momentum. The signal is selected based on a multivariate approach that is optimized for the difference between $m({\tilde{\mathrm{t}}}_1)$ and $m({\tilde{\chi }}_1^0)$. The contribution from leading background processes is estimated from data. No significant excess is observed above the expectation from standard model processes. The results of this search exclude top squarks at 95% confidence level for masses up to 480 and 700 GeV for $m({\tilde{\mathrm{t}}}_1)-m({\tilde{\chi }}_1^0$) = 10 and 80 GeV, respectively.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SUS-21-003 (CMS Public Pages)

References in corpus (13)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Simplified Models for a First Characterization of New Physics at the LHC
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• Squark and gluino production cross sections in pp collisions at $\sqrt{s}$ = 13, 14, 33 and 100 TeV
• Higgs boson production in association with top quarks in the POWHEG BOX
• Efficient Identification of Boosted Semileptonic Top Quarks at the LHC
• NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation
• Model-Independent Jets plus Missing Energy Searches

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