Violations of lepton-flavour universality in P -> l nu decays: a model-independent analysis

Abstract

We analyse the violations of lepton-flavour universality in the ratios B(P -> l nu)/B(P -> l' nu) using a general effective theory approach, discussing various flavour-symmetry breaking patterns of physics beyond the SM. We find that in models with Minimal Lepton Flavour Violation the effects are too small to be observed in the next generations of experiments in all relevant meson systems (P = Pi, K, B). In a Grand Unified framework with a minimal breaking of the flavour symmetry, the effects remain small in Pi and K decays while large violations of lepton-flavour universality are possible in B -> l nu decays.

arXiv comment13 pages

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Cited by in corpus (10)

• Soft Photon Problem in Leptonic B-decays
• Search for $B^{-}\to {\mu }^{-}{\bar{\nu }}_{\mu }$ Decays at the Belle Experiment
• Sterile neutrino and leptonic decays of the pseudoscalar mesons
• Non-Standard Neutrino Interactions at One Loop
• Search for $B^{+}\to e^{+}\nu$ and $B^{+}\to {\mu }^{+}\nu$ decays using hadronic tagging
• Search for $B^{+}\to e^{+}\nu$ and $B^{+}\to {\mu }^{+}\nu$ decays using hadronic tagging
• Flavor-Changing Higgs Decays in Grand Unification with Minimal Flavor Violation
• Constraints on the charged-current non-standard neutrino interactions induced by the gauge boson $W^{\prime }$
• Gamma(K -> e nu)/Gamma(K -> mu nu) in the Minimal Supersymmetric Standard Model
• Minimal Flavour Violation and Neutrino Masses without R-parity