Assertion: photon | /r/HasProperty | gluon
Facets:
Source sentences:
text: The observed elementary bosons are all gauge bosons: photons, W and Z bosons, gluons, except the Higgs boson which is a scalar boson.
text: The gauge bosons are the photon, which mediates the electromagnetic force, the gluon, which mediates the strong nuclear force, the intermediate vector bosons (the Z boson and the W boson), which mediate the weak nuclear force, and the hypothetical graviton, which mediates gravity.