"New Observations in Particle Physics: Four Top Quarks and W Boson Mass"

The ATLAS and CMS collaborations have both observed the simultaneous production of four top quarks, a very rare process predicted by the Standard Model theory. This is the first direct observation of this phenomenon, which is 70 thousand times rarer than the production of top quark-antiquark pairs. Both experiments used novel machine-learning techniques to detect the elusive four-top-quark signature, which can be highly varied and challenging to detect. This observation is an exciting new step in learning more about top quarks and physics beyond the Standard Model.