论文标题
在CERN高强度kaon束设备上罕见腐烂
Rare decays at the CERN high-intensity kaon beam facility
论文作者
论文摘要
稀有KAON衰减的分支比率（BR）的精确测量可以为CKM单位性提供独特的约束，并可能揭示出新物理学的存在。其中两个衰变的BRS，$ k^+\toπ^+ν\barν$和$ k_l \toπ^0ν\barν$在标准模型中受到了强烈抑制，而它们的速率可以通过很小的理论不确定性来计算。这些衰减对高质量尺度和几个新物理模型的潜在敏感性，可以预测大型模型，并预测了标准模型的几个模型。最近在$ k \toπν\barν$ brs的测量中取得了很多进展。 Following upon NA62's successful application of the in-flight technique to measure ${\rm BR}(K^+\toπ^+ν\barν)$, we envision a comprehensive program for the study of the rare decay modes of both $K^+$ and $K_L$ mesons, to be carried out with high-intensity kaon beams from the CERN SPS in multiple phases, including both an experiment to measure $ {\ rm br}（k^+\toπ^+ν\barν）$在5％级别和一个测量$ {\ rm br}的实验（k_l \toπ^0ν\barν）$在20％级别。还可以重新配置探测器，以允许用带电粒子的$ k_l $衰减的测量值，例如$ k_l \toπ^0 \ ell^+\ ell^ - $。
Precision measurements of the branching ratios (BRs) for rare kaon decays can provide unique constraints on CKM unitarity and may reveal the existence of new physics. The BRs for two of these decays, $K^+\toπ^+ν\barν$ and $K_L\toπ^0ν\barν$, are strongly suppressed in the Standard Model, while their rates can be calculated with very small theoretical uncertainties.These decays are potentially sensitive to high mass scales, and several models of new physics predict large deviations from the Standard Model. Much progress has been made recently in the measurement of the $K\toπν\barν$ BRs. Following upon NA62's successful application of the in-flight technique to measure ${\rm BR}(K^+\toπ^+ν\barν)$, we envision a comprehensive program for the study of the rare decay modes of both $K^+$ and $K_L$ mesons, to be carried out with high-intensity kaon beams from the CERN SPS in multiple phases, including both an experiment to measure ${\rm BR}(K^+\toπ^+ν\barν)$ at the 5% level and an experiment to measure ${\rm BR}(K_L\toπ^0ν\barν)$ at the 20% level. The detectors could also be reconfigured to allow measurements of $K_L$ decays with charged particles, such as $K_L\toπ^0\ell^+\ell^-$.
