arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.2052hep-ex
收藏

K^{-}_{ e3 }分支比的测定

Measurement of K^{-}_{e3} branching ratio

V. I. Romanovsky, S. A. Akimenko, G. I. Britvich, K. V. Datsko, A. P. Filin, A. V. Inyakin, A. S. Konstantinov, I. Y. Korolkov, V. A. Khmelnikov, V. M. Leontiev… 展开作者

V. I. Romanovsky, S. A. Akimenko, G. I. Britvich, K. V. Datsko, A. P. Filin, A. V. Inyakin, A. S. Konstantinov, I. Y. Korolkov, V. A. Khmelnikov, V. M. Leontiev, V. P. Novikov, V. F. Obraztsov, V. A. Polyakov, V. I. Shelikhov, O. G. Tchikilev, V. A. Uvarov, O. P. Yushchenko, V. N. Bolotov, V. A. Duk, S. V. Laptev, A. Yu. Polyarush

备注：
10 pages, 8 figures
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

衰变$K^{-} \to π^{0} e \bar ν$的分支分数是使用{ \bf ISTRA+}装置在U-70 PS：\linebreak $Br_{K_{e3}}= (5.124 \pm 0.009 (stat) \pm 0.029(norm) \pm 0.030(syst))%$的25 GeV负次级束下检测到的飞行中衰变来测量的。从该值中提取CKM矩阵的$|V_{us}|$元素，使用先前测量的$f_{+}(t)$形状因子：$|V_{us}|=0.227 \pm 0.002$。计算结果与BNL E865、FNAL KTeV、KLOE的测量结果一致。

英文摘要：

The branching fraction for the decay $K^{-} \to π^{0} e \bar ν$ is measured using in-flight decays detected with {\bf ISTRA+} setup working at the 25 GeV negative secondary beam of the U-70 PS:\linebreak $Br_{K_{e3}}= (5.124 \pm 0.009 (stat) \pm 0.029(norm) \pm 0.030(syst))%$. From this value the $|V_{us}|$ element of the CKM matrix is extracted, using previously measured $f_{+}(t)$ form factor: $|V_{us}|=0.227 \pm 0.002$. The results are in agreement with recent measurements by BNL E865, FNAL KTeV, KLOE.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑