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In a first search of its kind at the LHC, the CMS experiment looks for light beyond-the-standard-model particles with mass in the GeV range decaying to charged hadrons and muons. It establishes that if they exist, they would be produced in less than 0.01% of Higgs boson decays.

The Higgs boson discovery in 2012 confirmed a crucial piece of the standard model. The unique properties of the Higgs boson ...