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New analysis of the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\Delta I = 1/2$\end{document} rule in kaon decays and the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\hat{B}_K$\end{document} parameter
被引：0
作者：
T. Hambye
G.O. Köhler
P.H. Soldan
机构：
[1] INFN – Laboratori Nazionali di Frascati,
[2] P.O. Box 13,undefined
[3] I-00044 Frascati,undefined
[4] Italy (hambye@lnf.infn.it)
,undefined
[5] Institut für Physik,undefined
[6] Universität Dortmund,undefined
[7] D-44221 Dortmund,undefined
[8] Germany (koehler,undefined
[9] soldan@doom.physik.uni-dortmund.de)
,undefined
关键词：
Matrix Element;
Order Term;
Transition Amplitude;
High Order Term;
Significant Dependence;
D O I：
10.1007/s100529900084
中图分类号：
学科分类号：
摘要：
We present a new analysis of the \documentclass[12pt]{minimal}
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\begin{document}$\Delta I = 1/2$\end{document} rule in \documentclass[12pt]{minimal}
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\begin{document}$K\rightarrow \pi\pi$\end{document} decays and the \documentclass[12pt]{minimal}
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\begin{document}$\hat{B}_K$\end{document} parameter. We use the \documentclass[12pt]{minimal}
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\begin{document}$1/N_{\mathrm c}$\end{document} expansion in the effective chiral lagrangian for the pseudoscalar mesons and compute the hadronic matrix elements at leading and next-to-leading order in the chiral and the \documentclass[12pt]{minimal}
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\begin{document}$1/N_{\mathrm c}$\end{document} expansions. Numerically, our calculation reproduces the dominant \documentclass[12pt]{minimal}
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\begin{document}$\Delta I = 1/2$\end{document}\documentclass[12pt]{minimal}
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\begin{document}$K\rightarrow\pi\pi$\end{document} amplitude. Our result depends only moderately on the choice of the cutoff scale in the chiral loops. The \documentclass[12pt]{minimal}
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\begin{document}$\Delta I = 3/2$\end{document} amplitude emerges sufficiently suppressed but shows a significant dependence on the cutoff. The \documentclass[12pt]{minimal}
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\begin{document}$\hat{B}_K$\end{document} parameter turns out to be smaller than the value previously obtained in the \documentclass[12pt]{minimal}
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\begin{document}$1/N_{\mathrm c}$\end{document} approach. It also shows a significant dependence on the choice of the cutoff scale. Our results indicate that corrections from higher order terms and/or higher resonances are large for the \documentclass[12pt]{minimal}
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\begin{document}$\Delta I = 3/2$\end{document}\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
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\usepackage{mathrsfs}
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\setlength{\oddsidemargin}{-69pt}
\begin{document}$K\rightarrow\pi\pi$\end{document} amplitude and the \documentclass[12pt]{minimal}
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\begin{document}$(|\Delta S|=2)$\end{document}\documentclass[12pt]{minimal}
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\begin{document}$K^0$\end{document}–\documentclass[12pt]{minimal}
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\begin{document}$\bar{K}^0$\end{document} transition amplitude.
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页码：271 / 292
页数：21
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