标题： D介子的稀有和禁戒衰变 显示英文标题

标题： Rare and Forbidden Decays of D Mesons

摘要： 我们总结了两项最近关于D+、Ds和D0介子（及其反粒子）发生味改变中性流、轻子味破坏和轻子数破坏衰变的搜索结果，这些衰变模式包含μ子和电子。 利用Fermilab charm强子产生实验E791的数据，我们研究了D+和Ds π,l,l和K,l,l衰变模式以及D0双轻子衰变模式，这些模式包含l+,l-，ρ0、K*0或φ矢量介子，或者非共振π,π、K,π或K,K的伪标量介子对。 未发现这些衰变的证据。 因此，我们在90%置信水平下给出了所检查的51个衰变模式的分支比上限。 其中26个模式之前没有报道过限制，其余模式中有18个的限制相比先前发表的结果有显著改进。 显示英文摘要

摘要： We summarize the results of two recent searches for flavor-changing neutral current, lepton-flavor violating, and lepton-number violating decays of D+, Ds, and D0 mesons (and their antiparticles) into modes containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, we examined D+ and Ds pi,l,l and K,l,l decay modes and the D0 dilepton decay modes containing either l+,l-, a rho0, K*0, or phi vector meson, or a non-resonant pi,pi, K,pi, or K,K pair of pseudoscalar mesons. No evidence for any of these decays was found. Therefore, we presented branching-fraction upper limits at 90% confidence level for the 51 decay modes examined. Twenty-six of these modes had no previously reported limits, and eighteen of the remainder were reported with significant improvements over previously published results.