| http://www.w3.org/ns/prov#value | - However it was not understood why the photon is massless and the W and Z particles are massive.What is now known as the Higgs mechanism was proposed by Peter Higgs and others as a way of explaining why this should be the case.In the Standard Model, quantum numbers such as electric charge are dependent on 'coupling' to the appropriate field ??? in this case the electromagnetic field.
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