Although physicists believe that there are "Four interactions" in Nature, all mediated by particles, only the "supersticky gluon" is properly named gluon. The mediating particles are sometimes collectively referred to as "vector bosons". The gravitation is believed to be mediated by a "graviton" (not observed). Electromagnetism is mediated by massless "photons". The weak interaction is mediated by the W+, W+ and Z0 particles, discovered at CERN in 1983, and awarded the Nobel Price in 1984.
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