The CKM phase α through B → a₀ π

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We propose the decay modes B → a₀ (→ ηπ) π to determine the CKM phase α. One can analyze these modes through (i) the B → a₀ π isospin pentagon, (ii) the time dependent Dalitz plot of B⁰(t) → a₀± π∓ → ηπ+ π-, and (iii) the time dependence of B⁰(t) → a₀⁰ (→ ηπ⁰) π⁰. We show that the a₀ π modes have certain advantages as compared to the ρπ modes, and strongly recommend the time dependent Dalitz plot analysis in the a₀ π channel.