Speaker
Description
The first study of four top quark production in final states with hadronically decaying tau leptons (τh) 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. Tau lepton final states provide sensitivity to BSM scenarios with enhanced thirdgeneration couplings and complement established multilepton searches. The analysis is divided into subchannels with one τh and zero, one, or two additional electrons and muons to optimize sensitivity. Combining the three channels, the observed (expected) significance of the measured t¯tt¯t signal with respect to the standard model background-only hypothesis is 1.1 (1.0) standard deviations. The production cross section of four top quarks is measured to be 16+14−12 (stat)+12−8 (syst) fb. Additionally, a search is performed for vector-like leptons within the framework of the 4321 model in the same τh phase space. No significant excess is observed, and a lower limit of 830 GeV is set at 95% confidence level on the vector-like lepton mass, providing the first constraints from final states containing electrons and muons.
| 请选择分会 | TeV物理和超出标准模型新物理 |
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