Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-03-31
Eur.Phys.J.C16:97-104,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, LaTeX, 8 figures
Scientific paper
10.1007/s100520050006
As we pointed out recently, the neutral decays $B_d\to\pi^\mp K^\pm$ and $B_d\to\pi^0K$ may provide non-trivial bounds on the CKM angle $\gamma$. In this paper, 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 $\gamma$, 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 $\delta_n$ are in favour of a negative value of $\cos\delta_n$, 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 $B\to\pi K$ system: whereas these decays favour a range for $\gamma$ that is similar to that of the neutral modes, they point towards a positive value of $\cos\delta_c$, which would be in conflict with the expectation of equal signs for $\cos\delta_n$ and $\cos\delta_c$. If future data should confirm this ``puzzle'', it may be an indication for new-physics contributions to the electroweak penguin sector, or a manifestation of large non-factorizable SU(3)-breaking effects.
Buras Andrzej J.
Fleischer Robert
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