The ATLAS and CMS experiments at LHC have observed the production of the Higgs boson in association with a pair of top quarks. The observation of this rare process is a fundamental leap forward in knowledge in the field of high energy physics: it will allow physicists to verify some of the most critical parameters of the Standard Model of elementary particles.
The ATLAS collaboration announced the observation on June 4th at the LHCP-2018 international conference in Bologna. The analysis uses all the data related to the proton-proton collisions produced by the Large Hadron Collider (LHC) and collected by the ATLAS detector at CERN in Geneva: the analysis highlights the presence of this signal with a very high statistical significance equal to 6.3 standard deviations. A similar observation, with a statistical significance of 5.2 obtained on a smaller data set, has recently been published by the CMS collaboration.
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