Observation of four-top-quark production in the multi lepton final state with the ATLAS Detector – Zhi Zheng (Stanford/SLAC)

Tuesday 4 Apr 2023, 12:30 → 13:30 America/Los_Angeles

48/2-224 - Madrone (SLAC)

We report the observation of four-top-quark (tttt) production in the LHC collision, performed using an integrated luminosity of 140~fb-1 at a centre-of-mass energy of 13~TeV collected using the ATLAS detector. 

For this new result, by leveraging developments in detector performance, new analysis techniques and a better understanding of major background processes, the significance for tttt signal improved significantly compared with previous result.

Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tttt production.

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FPD_mar20_zzheng_v3.pdf

video1994560231.mp4