SU(3) BREAKING IN (B)OVER-BAR/D-]KL(V)OVER-BAR DECAYS AND THE VALUE OF V-CD/V-CS

被引:26
作者
NARISON, S [1 ]
机构
[1] UNIV MONTPELLIER 2,PHYS MATH LAB,F-34095 MONTPELLIER 05,FRANCE
关键词
D O I
10.1016/0370-2693(94)91462-1
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We determine the SU(3)-breaking effects in the ($) over bar B/D --> Kl $$($) over bar nu decays from the ratio of the ($) over bar B/D --> Kl $$($) over bar nu over the ($) over bar B/D --> pi l $$($) over bar nu semileptonic form factors using a semi-analytic expression based on QCD spectral sum rules. We obtain f(+)(($) over bar B-->K) (0)/f(+)(($) over bar B-->pi) (0) = 1.007 +/- 0.020 and f(+)(D-->K)(0)/f(+)(D-->pi)(0) = 1.102 +/- 0.007, which combined with the present CLEO data, leads to V-cd/V-cs = 0.323 +/- 0.058 and then, to: \V-cs\ = 0.72 +/- 0.10. The prediction on the ratio of mixing angle is (surprisingly) much higher than the value 0.226 +/- 0.004 derived from the unitarity constraint on the CKM matrix, while the corresponding value of V-cs is lower. These results can open a window for new physics, though a stringent conclusion needs data with much higher statistics (from, e.g., tau-charm factory) or/and alternative QCD-based estimates of the ratio of the semileptonic form factors.
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页码:163 / 168
页数:6
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