Constraints on $γ$ and Strong Phases from $B\toπK$ Decays
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As we pointed out recently, the neutral decays $B_d\toπ^\mp K^\pm$ and $B_d\toπ^0K$ may provide non-trivial bounds on the CKM angle $γ$. Here we reconsider this approach in the light of recent CLEO data, which look very interesting. In particular, the results for the corresponding CP-averaged branching ratios are in favour of strong constraints on $γ$, where the second quadrant is preferred. Such a situation would be in conflict with the standard analysis of the unitarity triangle. Moreover, constraints on a CP-conserving strong phase $δ_n$ are in favour of a negative value of $\cosδ_n$, which would be in conflict with the factorization expectation. In addition, there seems to be an interesting discrepancy with the bounds that are implied by the charged $B\toπK$ system: whereas these decays favour a range for $γ$ that is similar to that of the neutral modes, they point towards a positive value of $\cosδ_c$, which would be in conflict with the expectation of equal signs for $\cosδ_n$ and $\cosδ_c$.
5 pages, LaTeX, 2 figures. Talk given by R. Fleischer at ICHEP 2000, Osaka, Japan, 27 July - 2 August 2000. To appear in the Proceedings
5 pages, LaTeX, 2 figures. Talk given by R. Fleischer at ICHEP 2000, Osaka, Japan, 27 July - 2 August 2000. To appear in the Proceedings