标题： 辐射弱湮灭衰变 显示英文标题

标题： Radiative Weak Annihilation Decays

摘要： 一种在G_F阶次下仅对一种夸克拓扑结构敏感的介子衰变模式（通过W玻色子的价夸克湮灭）被描述。这些衰变尚无实验观测结果，甚至没有上限报告。这项工作给出了它们分支比的简单估算（数量级计算），并与已有之前计算的结果进行了比较。尽管这些衰变较为稀有，其中一种模式（D_s^+ --> rho^+ gamma）可能已经在魅夸克实验中可观测到，另外两种模式（D^+ --> K^{*+} gamma, B^+ --> D_s^{*+} gamma）应在B介子工厂中出现，其余的则在强子对撞机上出现。 显示英文摘要

摘要： A class of meson decay modes sensitive to only one quark topology at leading G_F order (annihilation of valence quarks through a W) is described. No experimental observations, nor even upper limits, have been reported for these decays. This work presents a simpleminded (order-of-magnitude) calculation of their branching fractions, and compares to results of previous calculations where available. Although rare, one of these modes (D_s^+ --> rho^+ gamma) might already be observable at charm experiments, two others (D^+ --> K^{*+} gamma, B^+ --> D_s^{*+} gamma) should appear at the B factories, and the rest at hadron colliders.