The CP-conserving contribution to KL→π0ν(ν)over-bar in the standard model

被引：61

作者：

Buchalla, G ^{[1
]}

Isidori, G

机构：

[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

[2] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

来源：

PHYSICS LETTERS B | 1998年 / 440卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(98)01088-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The rare decay K-L --> pi(0)nu(nu)over-bar is dominated by direct CP violation and can be computed with extraordinarily high precision. In principle, also a CP-conserving contribution to this process can arise within the Standard Model. We clarify the structure of the CP-conserving mechanism, analysing both its short-distance and long-distance components. It is pointed out that the calculation of the CP-conserving amplitude, although sensitive in part to non-perturbative physics, is quite well under control. The resulting CP-conserving contribution to the rate for K-L --> pi(0)nu(nu)over-bar turns out to be very strongly suppressed because of several factors, which we discuss in detail. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：170 / 178

页数：9

共 17 条

[1]

BOSSI F, LNF98004P

[2] K->pi nu(nu)over-bar and high precision determinations of the CKM matrix [J].