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We introduce a new parameterization of $B\rightarrow D \pi \ell \nu$ formfactors using a partial-wave expansion and derive bounds on the seriescoefficients using analyticity and unitarity. This is the first generalizationof the model-independent formalism developed by Boyd, Grinstein, and Lebed for$B \to D \ell \nu$ to semileptonic decays with multi-hadron final states, andenables data-driven form factor determinations with robust,systematically-improvable uncertainties. Using this formalism, we extract theform-factor parameters for $B \to D_2^\ast(\to D\pi) \ell \nu$ decays in amodel-independent way from fits of data from the Belle Experiment, and, for thefirst time, study the two-pole structure in the $D\pi$ S-wave in semileptonicdecays employing lineshapes from unitarized chiral perturbation theory.

A model independent description of $B\rightarrow D \pi \ell \nu$ decays