Rare Kaon Decay Experiments

罕见的 Kaon 衰变实验

• 批准号: SAPPJ-2018-00017
• 负责人: Bryman, Douglas
• 金额: $ 12.53万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693985
• 关键词: Rare; Kaon; Decay; Experiments

High precision measurement of the ultra-rare kaon decay K+ to pi+ neutrino anti-neutrino (KPNN) at the CERN experiment NA62 will be one of the most incisive probes of quark flavor physics. The branching ratio is sensitive to new physics models not easily accessible by other reactions which extend the Standard Model (SM) to solve its considerable problems. The SM prediction for the KPNN branching fraction is theoretically robust at the 5% level. Only a precious few accessible 2nd order weak interaction quark processes can be predicted with this level of certainty. The suppression of the KPNN branching fraction in the SM to the level 10-10 allows physics beyond the SM to contribute dramatically to the branching fraction. The certainty with which the SM contribution to KPNN can be predicted permits significant discovery potential for new physics with sensitivity to probe a wide variety of models of new physics with mass scales well beyond the direct reach of the Large Hadron Collider. NA62 expects to have sensitivity for observing 80 events at the SM level for KPNN covering most of the parameter space for new physics models to contribute. It will also study many other rare or forbidden reactions to search for dark matter, heavy sterile neutrinos, neutral pion decays, and radiative processes. In addition, searches for axion-like and hidden sector particles are being investigated using an alternate mode of operation.

在欧洲核子研究中心（CERN）的NA 62实验上，对K ~+到π ~+中微子反中微子（KPNN）的超稀有K ~+衰变过程进行高精度测量，将是对夸克味物理最深入的探索之一。分支比是敏感的新的物理模型不容易访问的其他反应扩展的标准模型（SM），以解决其相当大的问题。KPNN分支分数的SM预测在5%水平下理论上是稳健的。只有极少数的二阶弱相互作用夸克过程可以用这种程度的确定性来预测。SM中的KPNN分支分数被抑制到10-10级允许SM之外的物理对分支分数做出显着贡献。可以预测SM对KPNN的贡献的确定性允许新物理学的重大发现潜力，其灵敏度可以探测各种各样的新物理模型，其质量尺度远远超出大型强子对撞机的直接范围。 NA 62预计将在SM级别上对KPNN的80个事件进行观测，覆盖新物理模型贡献的大部分参数空间。它还将研究许多其他罕见或禁止的反应，以寻找暗物质，重无菌中微子，中性π衰变和辐射过程。此外，正在使用另一种操作模式研究对轴子和隐藏扇区粒子的搜索。