An investigation of the very rare $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
An investigation of the very rare $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
复制标题
对非常罕见的 $$ {K}^{ } o {pi}^{ } u overline{ u} $$ 衰减的调查
DOI：
10.1007/jhep11(2020)042
复制
发表时间：
2020
影响因子：
5.4
通讯作者：
Bryman, D.
中科院分区：
文献类型：
--
作者：
Cortina Gil, E.;Kleimenova, A.;Minucci, E.;Padolski, S.;Petrov, P.;Shaikhiev, A.;Volpe, R.;Numao, T.;Velghe, B.;Bryman, D.
NA62实验报告了对2017年在CERN SPS收集的衰变样本中的模式的调查。实验已经实现了单事件灵敏度，对应于2.2个事件，假设标准模型分支比为。观察到两个信号候选者具有1.5个事件的预期背景。结合NA62在2016年记录的较小数据集上进行的类似分析的结果，该合作现在报告了分支比的上限为90\%\，CL。这与相应的68%CL测量值一起，是目前全球最精确的结果，并且能够限制一些新物理模型，这些模型预测了先前测量仍然允许的大增强。
The NA62 experiment reports an investigation of themode from a sample ofdecays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of, corresponding to 2.2 events assuming the Standard Model branching ratio of. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit offor thebranching ratio at 90\%\,CL. This, together with the corresponding 68\%\,CL measurement of, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.