ρ-ω mixing and direct CP violation in hadronic B-decays

The extraction of CKM-matrix-element information from hadronic B-decays generally suffers from discrete ambiguities, hampering the diagnosis of physics beyond the Standard Model. We show that a measurement of the rate asymmetry, which is CP-violating, in B^±→ρ^±ρ⁰(ω)→ρ^±π⁺π⁻, where the invariant mass of the π⁺π⁻ pair is in the vicinity of the ω resonance, can remove the mod(π) uncertainty in α ≡ arg[−V_td^*V_tb/(V_udV_ub^*)] present in standard analyses.