Search for heavy neutral lepton production in K+ decays
Search for heavy neutral lepton production in K+ decays
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DOI：
10.1016/j.physletb.2018.01.031
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发表时间：
2017-12
影响因子：
4.4
通讯作者：
NA48 collaboration
中科院分区：
文献类型：
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作者：
NA48 collaboration
报道了使用2015年欧洲核子研究中心NA 62实验在最小偏差触发下收集的数据样本来寻找K+衰变中重中性轻子的产生。在10− 7到10− 6水平的上限建立在扩展中微子混合矩阵的元素上|U e 4| 2和|U μ 4| 2的重中性轻子质量范围分别为170-448 MeV/c2和250-373 MeV/c2。这改进了先前在考虑的整个质量范围内HNL生产搜索的限制，|U e 4| 2和300 MeV/c 2以上，|U μ 4|二、
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the 10− 7 to 10− 6 level are established on the elements of the extended neutrino mixing matrix| U e 4| 2 and| U μ 4| 2 for heavy neutral lepton mass in the ranges 170–448 MeV/c 2 and 250–373 MeV/c 2, respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for| U e 4| 2, and above 300 MeV/c 2 for| U μ 4| 2.