Decay channels are the possible transformations a particle can undergo as it decays.
When a particle decays, it does not break into smaller bits; its energy does. Even fundamental particles—so named because they are the basic building blocks of matter that cannot be broken into smaller parts—can decay. Many particles in the Standard Model exist for only a limited time before decaying.
When a particle decays, it transforms into collections of less massive particles whose combined energy adds up to the energy of the original particle.
Many have speculated about which theorists the Nobel Committee might honor for the prediction of the Higgs boson, but it was the experimentalists involved in the search for the particle who received recognition today.