The first evidence of a rare Higgs boson decay

ATLAS and CMS report that they have found the first evidence of a rare process in which the Higgs boson decays into a Z boson and a photon. This decay of the Higgs boson can provide indirect evidence for the existence of particles other than those predicted by the Standard Model of particle physics.

"The existence of new particles could have very significant effects on rare Higgs decay modes," says CMS physics coordinator Florencia Canelli. "This study is a powerful test of the Standard Model. With the ongoing third run of the LHC and the future High-Luminosity LHC, we will be able to improve the precision of this test and probe ever rarer Higgs decays."

Source: https://phys.org/news/2023-05-evidence-rare-higgs-boson-decay.html