Searches for the superpartner of the top quark are of special interest in the larger context of searches for supersymmetry, as it could play a central role in the solution of the hierarchy problem given its large coupling to the Higgs boson. The CMS Collaboration has looked for hints of top squark production in fully hadronic, semi-leptonic and fully leptonic final states with the whole dataset of proton-proton collisions collected during the Run 2 of the LHC. Advanced, novel strategies for object identification and background reduction, based on machine learning, are used to maximize the sensitivity to new physics for different configurations of the sparticle mass spectrum. Inclusive analyses are complemented by dedicated searches for the most challenging topologies, such as those where the signal mimics the standard model background from top quark pair production. Results from all channels are combined. Moreover, top squark production in R-parity violating and stealth supersymmetry models is searched for with a dedicated analysis. The seminar will present the analysis methods used in these searches and their results.
Michelangelo Mangano, Monica Pepe-Altarelli and Pedro Silva.