arXiv 1002.16552010-02hep-exhep-ph

带电赝标介子的轻子衰变

Leptonic Decays of Charged Pseudoscalar Mesons

Jonathan L. Rosner, Sheldon Stone

备注：: 10 pages, 1 figure. Expanded version of a review prepared for the Particle Data Group (2010). Numbers updated and some references added.

摘要：

本文综述了$π^\pm$、$K^\pm$、$D^{\pm}$、$D_s^\pm$和$B^\pm$赝标介子的纯轻子衰变物理。所测得的衰变率与组分夸克的相关弱相互作用CKM矩阵元和与介子中夸克和反夸克波函数重叠相关的强相互作用参数（称为衰变常数$f_P$）的乘积有关。理论和实验之间的相互作用对于每个粒子都是不同的。$B$扇区中所需的$f_B$的理论预测可以通过测量魅力扇区中的$f_{D^+}$和$f_{D_s^+}$来测试。目前，这些测试并不令人满意。由于测量和理论预测的准确性，较轻的$π$和$K$介子提供了实验和理论之间的严格比较。这篇评论的删节版是为粒子数据组2010年版准备的。

英文摘要：

We review the physics of purely leptonic decays of $π^\pm$, $K^\pm$, $D^{\pm}$, $D_s^\pm$, and $B^\pm$ pseudoscalar mesons. The measured decay rates are related to the product of the relevant weak-interaction-based CKM matrix element of the constituent quarks and a strong interaction parameter related to the overlap of the quark and anti-quark wave-functions in the meson, called the decay constant $f_P$. The interplay between theory and experiment is different for each particle. Theoretical predictions of $f_B$ that are needed in the $B$ sector can be tested by measuring $f_{D^+}$ and $f_{D_s^+}$ in the charm sector. Currently, these tests are unsatisfactory. The lighter $π$ and $K$ mesons provide stringent comparisons between experiment and theory due to the accuracy of both the measurements and the theoretical predictions. An abridged version of this review was prepared for the Particle Data Group's 2010 edition.

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