Studying how the Higgs couples to lighter quarks remains much more difficult. Its interactions with “second-generation” quarks, like the charm quark, and “first-generation” quarks, the up and down quarks that form the nuclei of atoms, are still largely untested.
This leaves open the key question of whether the Higgs boson is responsible for giving mass to the very quarks that make up everyday matter.
To explore these interactions, physicists examine how the Higgs boson decays into other particles or is produced alongside them in high-energy proton–proton collisions at the LHC.
At a recent CERN seminar, the CMS collaboration presented the first search for a Higgs boson decaying into two charm quarks in events where the Higgs is produced together with a pair of top quarks.
By applying advanced artificial intelligence methods, the team achieved the strongest limits so far on the strength of the Higgs boson’s interaction with the charm quark.
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