Speaker
Description
The first study of four top quark production in final states with hadronically decaying tau leptons (th) is presented using proton-proton collision data collected by the CMS experiment at a center-of-mass energy of 13 TeV during the 2016–2018 period at the CERN LHC. This dataset corresponds to an integrated luminosity of 138 fb−1. The tau channel is divided into subchannels with zero, one, and two additional light leptons (electrons or muons) to optimize sensitivity. The combined analysis yields an observed (expected) significance of 1.0 (1.0) standard deviations. The production cross section of four top quarks is measured to be 16.1 +13.5−12.3 (stat) +11.9−8.3 (syst) fb. Additionally, a search is performed for vector-like leptons within the framework of the 4321 model in the same tau phase space. No significant excess is observed, and a lower limit of 834 GeV at 95% confidence level is set on the vector-like lepton mass, providing the first constraints from final states containing light leptons.
| Track | Top Physics |
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