Abstract
In the standard elektroweak theory, the charged current is given by
and describes the couplings of the charged vector bosons W ± to the lefthanded leptons and quarks. The unit matrix 1 in the lepton part reflects our present knowledge that emission of a W - by an electron always leads to an electron neutrino, never to a μ or τ neutrino, and that muons and τ-leptons obey the corresponding rule. In the quark sector the rules are different, emission of a W - by a d quark may may result in any of the three charge 2/3 quarks u, c, or t, and the same holds for the s and the b quark. The coupling strengths are however strictly connected to each other, the standard theory requires V to be a unitary matrix.
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Schubert, K.R. (1986). Experimental Determination of the Kobayashi-Maskawa Matrix Elements. In: Klapdor, H.V. (eds) Weak and Electromagnetic Interactions in Nuclei. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-71689-8_93
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DOI: https://doi.org/10.1007/978-3-642-71689-8_93
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