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Constraints on the CKM Angle $gamma$ and Strong Phases from $B opi K$ Decays | | Andrzej J. Buras
; Robert Fleischer
; | | Date: |
31 Mar 2000 | | Journal: | Eur.Phys.J. C16 (2000) 97-104 | | Subject: | hep-ph | | Abstract: | As we pointed out recently, the neutral decays $B_d opi^mp K^pm$ and $B_d opi^0K$ 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 $cosdelta_n$, 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 $B opi K$ 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 $cosdelta_c$, which would be in conflict with the expectation of equal signs for $cosdelta_n$ and $cosdelta_c$. 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. | | Source: | arXiv, hep-ph/0003323 | | Services: | Forum | Review | PDF | Favorites | |
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