Assessing lepton-flavour non-universality from B →K ℓℓ angular analyses

Bernat Capdevila, Sébastien Descotes-Genon, Joaquim Matias, Javier Virto

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82 Citations (Scopus)


© 2016, The Author(s). The B → K∗μμ decay exhibits deviations with respect to Standard Model expectations and the measurement of the ratio RK hints at a violation of lepton-flavour universality in B → Kℓℓ transitions. Both effects can be understood in model-independent fits as a short-distance contribution to the Wilson coefficient C9μ, with some room for similar contributions in other Wilson coefficients for b → sμμ transitions. We discuss how a full angular analysis of B → K∗ee and its comparison with B → K∗μμ could improve our understanding of these anomalies and help confirming their interpretation in terms of short-distance New Physics. We discuss several observables of interest in this context and provide predictions for them within the Standard Model as well as within several New Physics benchmark scenarios. We pay special attention to the sensitivity of these observables to hadronic uncertainties from SM contributions with charm loops.
Original languageEnglish
Article number75
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 1 Oct 2016


  • Beyond Standard Model
  • Heavy Quark Physics


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