2000/08/29 by Andrzej J. Buras, Buras, Andrzej J., Robert Fleischer +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0008298
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
arxiv created 2000/08/29 · arxiv updated 2009/11/30
As we pointed out recently, the neutral decays Bd→π^∓ K^± and Bd→π0K 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 δn are in favour of a negative value of cosδn, 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→πK 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 cosδc, which would be in conflict with the expectation of equal signs for cosδn and cosδc.