The 15th International Workshop on Tau Lepton Physics
In the Standard Model, the three charged leptons are identical copies of each other,
apart from mass differences. Experimental tests of this feature in semileptonic decays
of b-hadrons are highly sensitive to New Physics particles which preferentially couple
to the 2nd and 3rd generations of leptons.
A review of the latest lepton universality tests in semileptonic $b\to c$ transitions
at LHCb is reported.