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We propose the decay modes $B \to a_0 (\to \eta \pi) \pi$ to determine theCKM phase $\alpha$. One can analyze these modes through (i) the $B \to a_0 \pi$isospin pentagon, (ii) the time dependent Dalitz plot of $B^0(t) \to a_0^{\pm}\pi^{\mp} \to \eta \pi^+ \pi^-$, and (iii) the time dependence of $B^0(t) \toa_0^0 (\to \eta \pi^0) \pi^0$. We show that the $a_0 \pi$ modes have certainadvantages as compared to the $\rho \pi$ modes, and strongly recommend the timedependent Dalitz plot analysis in the $a_0 \pi$ channel.Comment: 11 pages RevTeX, the final version to be published in Phys. Rev. D. A  few changes made in the text and the tabl

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

CKM phase<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>through<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>a</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>π</mml:mi></mml:math>

CKM phaseαthroughB→a0π