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I propose an alternative method for measuring the $CP$ violating phase$\phi_2$ ($\alpha$) without ambiguity in an extended SU(3) flavour symmetryanalysis, which can ultimately be achieved by exploiting interference effectsbetween $B \to AP$ and $B \to VV$ decay channels, where $A, V, P$ indicates anaxial-vector, vector and pseudo-scalar meson, respectively. Under certainassumptions on the relevant decays based on current experimental results andminimal theoretical input, I demonstrate with an idealised amplitude model thata programme to extract a single solution for $\phi_2$ in the range [0,$\pi$],with the added possibility to simultaneously constrain non-factorisableSU(3)-breaking effects, could be executed to similar precision using Run 3 dataat LHCb and the final Belle II sample.

Resolving the $\phi_2$ ($\alpha$) ambiguity in $B^0 \to a_1^\pm \pi^\mp$