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The $B$ meson semileptonic modes to $\rho(770)$ and $a_1 (1260)$ are usefulto pin down possible non Standard Model effects. The 4d differential $\bar B\to \rho(\pi \pi) \ell^- \bar \nu_\ell$ and $ \bar B \to a_1 (\rho \pi) \ell^-\bar \nu_\ell$ decay distributions are computed in SM and in extensionsinvolving new Lepton Flavour Universality violating semileptonic $b \to u$operators. The Large Energy limit for the light meson is also considered forboth modes. The new effective couplings are constrained using the availabledata, and several observables in $\bar B \to \rho(\pi\pi) \ell^- \bar \nu_\ell$in which NP effects can be better identified are selected, using the angularcoefficient functions. The complementary role of $\bar B \to \rho(\pi \pi)\ell^- \bar \nu_\ell$ and $\bar B \to a_1 (\rho \pi) \ell^- \bar \nu_\ell$ isdiscussed.

Probing New Physics with $\bar B \to \rho(770) \, \ell^- \bar \nu_\ell$ and $\bar B \to a_1(1260) \, \ell^- \bar \nu_\ell$