Quake Qin (Barcelona, IFAE)

Observation of tttt production and beyond

Abstract: The simultaneous production of four top quarks (tttt) is the heaviest process accessible via the current energy and luminosity of the CERN’s Large Hadron Collider (LHC). The large energy involved in the production makes it an ideal proxy to search for hidden heavy degrees of freedom beyond the Standard Model (SM) of particle physics. The ATLAS and CMS experiments reported the first observation of tttt production this year, with slightly larger measured production cross section than the predicted. The results from the ATLAS experiment are used for reinterpretation of physics beyond-the-SM (BSM) in the context of effective field theories in a model-independent approach. In addition, dedicated searches for heavy resonances in tttt events predicted by a variety of models are also performed by the ATLAS experiments. The on-going LHC Run 3 with an unprecedented pp collision energy of √s = 13.6 TeV will be a unique chance to further explore this extraordinary process.