X 0 Measurements
نویسنده
چکیده
The recent measurements of the color-suppressed modes B 0 → D(∗)0π0 imply non-vanishing relative final-state interaction (FSI) phases among various B → Dπ decay amplitudes. Depending on whether or not FSIs are implemented in the topological quark-diagram amplitudes, two solutions for the parameters a1 and a2 are extracted from data using various form-factor models. It is found that |a2(Dπ)| ∼ 0.35− 0.60 and |a2(D∗π)| ∼ 0.25− 0.50 with a relative phase of order 60◦ between a1 and a2. If FSIs are not included in quark-diagram amplitudes from the outset, a eff 2 /a eff 1 and aeff 2 will become smaller. The large value of |a2(Dπ)| compared to |aeff 2 (Dπ)| or naive expectation implies the importance of long-distance FSI contributions to color-suppressed internal W -emission via final-state rescatterings of the color-allowed tree amplitude. PACS numbers: 13.25.-k
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