Impact of Helicity-Isospin Convention Matching on the Extraction of $α$ from $B^0\to(ρπ)^0$

We show that the $ρ\toππ$ helicity convention used in the time-dependent Dalitz-plot measurements of $B^0\to(ρπ)^0$ decays does not match the convention assumed in the subsequent isospin analysis. Once corrected, the tension between the direct determination of the unitarity-triangle angle $α$ from t