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The Standard Model predicts that the electroweak couplings to the threecharged leptons are identical. However, in the last decade, experimentalmeasurements have suggested that semileptonic processes involving taus couldhave a slightly enhanced decay rate compared to their muonic counterparts. Ifconfirmed, this would be an unambiguous sign of New Physics, with variousscenarios introducing additional interactions that couple preferentially to thethird generation. Two recent lepton universality tests performed at LHCb arepresented in this proceedings of the first edition of the New Frontiers inLepton Flavour workshop.

Lepton Flavour Universality tests in $b \to c l \nu$ decays at LHCb