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2016

Revisiting Lepton Flavour Universality in B Decays

Feruglio, Ferruccio, Paradisi, Paride, Pattori, Andrea

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Lepton flavour universality (LFU) in B-decays is revisited by considering a class of semileptonic operators defined at a scale Lambda above the electroweak scale v.

The importance of quantum effects, so far neglected in the literature, is emphasised.
We construct the low-energy effective Lagrangian taking into account the running effects from Lambda down to v through the one-loop renormalization group equations (RGE) in the limit of exact electroweak symmetry and QED RGEs from v down to the 1 GeV scale.
The most important quantum effects turn out to be the modification of the leptonic couplings of the vector boson Z and the generation of a purely leptonic effective Lagrangian.

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