Constraints on the CKM angle γ and strong phases from B → πK decays

被引：0

作者：

Buras, AJ ^{[1
]}

Fleischer, R

机构：

[1] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

[2] DESY, D-22607 Hamburg, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2000年 / 16卷 / 01期

关键词：

D O I：

10.1007/s100520050006

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

As we pointed out recently, the neutral decays B-d --> pi(-/+)K(+/-) and B-d --> pi(0)K may provide nontrivial 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 --> 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.

引用

页码：97 / 104

页数：8

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