标题： 费米实验室E791实验中寻找罕见和禁戒的 charm介子衰变 显示英文标题

标题： Search for Rare and Forbidden Charm Meson Decays at Fermilab E791

摘要： 我们报告了一项针对D+、Ds+和D0介子（及其反粒子）的盲搜索结果，寻找其中的风味改变中性流、轻子味破坏以及轻子数破坏衰变，这些衰变会进入包含μ子和电子的衰变道。利用Fermilab charm强子产生实验E791的数据，我们检查了D+和Ds+的πll和Kll衰变道以及D0的l+l−衰变道。没有发现上述任何衰变的证据。因此，我们在90%置信水平下给出了所考察的24个衰变道的分支比上限。其中8个衰变道之前没有报道过限制条件，而另外14个衰变道的限制条件比先前发表的结果有显著改进。 显示英文摘要

摘要： We report the results of a blind search for flavor-changing neutral current, lepton-flavor violating, and lepton-number violating decays of D+, D(s)+, and D0 mesons (and their antiparticles) into modes containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, we examine the pi l l and K l l decay modes of D+ and D(s)+ and the l+ l- decay modes of D0. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 24 decay modes examined. Eight of these modes have no previously reported limits, and fourteen are reported with significant improvements over previously published results.