#CMSPaper 1231: It is commonly accepted that the #StandardModel is an effective theory, meaning it stops working at high energy. This #measurement uses #topquarks to test a pragmatic extension to the standard model, called standard model effective field theory (#SMEFT) assuming that more complex interactions are possible and each will change the behavior of existing particles like top quarks. And those changes can be checked (which is what this paper does)

https://arxiv.org/abs/2307.15761

#LHC experiments see four #topquarks

https://www.symmetrymagazine.org/article/lhc-experiments-see-four-top-quarks

Referenced link: https://phys.org/news/2023-03-atlas-cms-simultaneous-production-quarks.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-03-atlas-cms-simultaneous-production-quarks.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1639298288993316866#m

#ATLAS and CMS observe simultaneous production of four #topquarks https://phys.org/news/2023-03-atlas-cms-simultaneous-production-quarks.html

#CMSPaper 1210: Making four #topquarks is crucial to test the #Higgsboson coupling to top quarks and the strong coupling (both also sensitive to undiscovered particles, predicted or otherwise).

This new paper gives 3.9 sigma (=chance of random fluctuation of 0.005 percent!) evidence for four-top production, in challenging collisions where most/all of the four top quarks decay to jets. There was a lot of (new!) #machinelearning methods required to be this sensitive, btw http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-21-005/index.html