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To observe CP-violating asymmetries through the interference of a weakeramplitude with a stronger one in $\bo \to D^{(*)} \pi$ and $\ob \to D^{(*)}\pi$ decays, one must collect enough events that the intensity associated withthe weaker amplitude would be statistically significant. We show that providedthe weaker amplitude is measured separately in $B^\pm \to D^{(*)\pm} \pi^0$decays, the time-integrated approach requires around $2.5 \cdot 10^8 \ B \barB$ pairs for measurements of the weak phase $\sin(2\beta + \gamma)$ with anuncertainty of $0.05$ or better. We also determine the optimal conditions forprecise $2\beta + \gamma$ measurements and discuss the possibilities forresolving a discrete ambiguity.Comment: 18 pages, LaTeX, 4 figures, to be submitted to Phys. Rev.

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

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Extraction of a weak phase fromB→D(*)π