Can one measure the weak phase of a penguin diagram? art. no. 074020

被引：27
|
作者：
London, D
Sinha, N
Sinha, R
机构：
[1] Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada
[2] Inst Math Sci, Taramani 6000113, Chennai, India
来源：
PHYSICAL REVIEW D | 1999年 / 60卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.60.074020
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The b-->d penguin amplitude receives contributions from internal u, c and t quarks. We show that it is impossible to measure the weak phase of any of these penguin contributions without theoretical input. However, it is possible to obtain the weak phase if one makes a single assumption involving the hadronic parameters. With such an assumption, one can test for the presence of new physics in the b-->d favor-changing neutral current by comparing the weak phase of B-d(o)-(B) over bar(d)(o) mixing with that of the t-quark contribution to the b -->d penguin amplitude. [S0556-2821(99)00319-7].
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页数：9
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