At low energy experiments, gauge bosons as carriers of fundamental forces come in four families: the gluon family, the photon family, the W± and Z° family, and the graviton family. At high energy experiments, the photon family is combined with the W± and Z° family into an electroweak family; it seems that the classification of gauge bosons is now also a three family’s affair. http://en.wikipedia.org/wiki/Gauge_boson


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