Measurement of the KL→μ+μ-γ branching ratio and form factor from KTeV

被引：0

作者：

Quinn, B ^{[1
]}

机构：

[1] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2001年 / 16卷

关键词：

D O I：

10.1142/S0217751X01007728

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We report on the analysis of the rare decay K-L --> mu(+)mu(-)gamma using the 1997 data from the KTeV experiment at Fermilab. A total of 9327 candidate events are observed with 2.4% background, representing a factor of 40 increase in statistics over the current world sample. We find that BR(K-L --> mu(+)mu(-)gamma) = (3.66 +/- 0.04(stat) +/- 0.07(syst)) x 10(-7). The form factor parameter alpha(K*) is measured to be alpha(K*) = -0.157(-0.027)(+0.025). We make the first measurement of the parameter alpha from the D'Ambrosio, Isidori, and Portoles form factor, finding alpha = -1.53 +/- 0.09. This measurement of alpha limits the CKM parameter rho > -0.2.

引用

页码：657 / 659

页数：3

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