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

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

2009-06-16

arxiv.org/abs/0906.3024v1

Eur.Phys.J.C64:55-62,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages

Scientific paper

10.1140/epjc/s10052-009-1130-z

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.

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