On the colour suppressed decay modes (B)over-bar0→DS+DS- and (B)over-bar0s→D+D-

被引：16
|
作者：
Eeg, JO
Fajfer, S
Hiorth, A
机构：
[1] Univ Oslo, Dept Phys, N-0316 Oslo, Norway
[2] Univ Ljubljana, Dept Phys, SI-1000 Ljubljana, Slovenia
[3] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia
来源：
PHYSICS LETTERS B | 2003年 / 570卷 / 1-2期
关键词：
factorization; chiral loops; gluon condensate;
D O I：
10.1016/j.physletb.2003.07.013
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We point out that the decay modes (B) over bar (0) --> D-s(+) D-s(-) and (B) over bar (0)(s) --> D+ D- have no factorized contributions. At quark level these decays can only proceed through the annihilation mechanism, which in the factorized limit gives zero amplitude due to current conservation. In this Letter, we identify the dominating non-factorizable (colour suppressed) contributions in terms of two chiral loop contributions and one soft gluon emission contribution. The latter contribution can be calculated in terms of the (lowest dimension) gluon condensate within a recently developed heavy-light chiral quark model. We find branching ratios BR((B) over bar (0) --> D-s(+) D-s(-)) similar or equal to 7 x 10(-5) and BR((B) over bar (0)(s) --> D+ D-) similar or equal to 1 x 10(-3). (C) 2003 Published by Elsevier B.V.
引用
收藏
页码：46 / 52
页数：7
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