Searches for lepton number violating K+ decays

Searches for lepton number violating K+ decays
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搜索违反 K 衰变的轻子数

DOI:
10.1016/j.physletb.2019.07.041
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发表时间:
2019
期刊:
影响因子:
4.4
通讯作者:
Cortina Gil E
Cortina Gil E
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cortina Gil E

文献摘要

相似文献

欧洲核子研究中心的NA62实验报告了使用2017年收集的数据样本来搜索违反K+→π−e+e+和K+→π−μ+μ+衰变的轻子数量。没有观测到任何信号,在90%的置信度水平下,这两个衰变的分支分数的上限分别为2.2×10−10和4.2×10−11。这些上限分别比之前报道的测量结果提高了3倍和2倍。
The NA62 experiment at CERN reports a search for the lepton number violating decays K+→ π− e+ e+ and K+→ π− μ+ μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2× 10− 10 and 4.2× 10− 11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.