The standard model (SM) predicts that the W boson decays equally to all three flavours of leptons, known as lepton flavour universality. Many studies have been performed to measure the rate at which the W boson decays to different flavors of leptons to test this accidental symmetry. Because of the high mass of the ฯ lepton, the measurement of the ratio between the branching fraction of W bosons in ฯ and ฮผ channels is a good probe for physics beyond the SM. We report the results on lepton flavour universality from different experiments
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Suryadevara et al. (2024) studied this question.
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