Short-distance information from B(KL→μ+μ-)

被引：90

作者：

D'Ambrosio, G

Isidori, G

Portoles, J

机构：

[1] Univ Naples, Dipartimento Sci Fis, INFN, I-80125 Naples, Italy

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

来源：

PHYSICS LETTERS B | 1998年 / 423卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)00146-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A new analysis of the long-distance two-photon dispersive amplitude of K-L --> mu(+)mu(-) is presented. We introduce a phenomenological parameterization of the K-L --> gamma*gamma* form factor, constrained at low energies by K-L --> gamma l(+)l(-)(l = e, mu) data and at high energies by perturbative QCD. Using this form factor we provide a reliable estimate of magnitude and relative uncertainty of the two-photon dispersive contribution to K-L --> mu(+)mu(-). We finally discuss the implications of this analysis for the extraction of short-distance information from B(K-L --> mu(+)mu(-)). (C) 1998 Published by Elsevier Science B.V.

引用

页码：385 / 394

页数：10

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