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Anomalies recently observed in semileptonicb → c  ℓ −    ν ¯  ℓandb → s  ℓ +   ℓ −transitions point to violation of Lepton Flavour Universality. Strategies for new analyses of different modes are required, in particular for the modes induced by theb → utransition. We describe the purely leptonic B decay, theB ¯  → π  ℓ −    ν ¯  ℓchannel and the B semileptonic modes toρ ( 770 )anda 1   ( 1260 )in extensions of the Standard Model involving Lepton Flavour Universality violatingb → uoperators. In particular, we review the observables in the four-dimensional angularB ¯  → ρ  ( π π )   ℓ −    ν ¯  ℓandB ¯  →  a 1   ( ρ π )   ℓ −    ν ¯  ℓdistributions, suitable to pin down deviations from the Standard Model. We discuss the complementarity among the various modes for New Physics searches.

Probes of Lepton Flavor Universality in b → u Transitions