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Rare Kaon Decay Experiments

罕见的 Kaon 衰变实验

基本信息

批准号：
SAPPJ-2020-00026
负责人：
Bryman, Douglas
金额：
$ 12.82万
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：
2021
资助国家：
加拿大
起止时间：
2021-01-01 至 2022-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741709
关键词：
Rare Kaon Decay Experiments

项目摘要

High precision measurement of the ultra-rare kaon decay K+ to pi+ neutrino anti-neutrino (KPNN) at the CERN experiment NA62 is 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 is aiming for sensitivity for observing 80 events at the SM level for KPNN covering most of the parameter space for new physics models to contribute. It also studies 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） NA62实验中高精度测量超稀有的K+到π +的中微子反中微子（KPNN）是夸克味物理最敏锐的探测之一。分支比对新的物理模型很敏感，这是其他反应难以获得的，它扩展了标准模型，解决了标准模型的许多问题。对于KPNN分支分数的SM预测在5%的水平上理论上是稳健的。只有极少数可获得的二阶弱相互作用夸克过程能够以这种确定性进行预测。在SM中的KPNN分支分数被抑制到10-10的水平，使得SM之外的物理对分支分数有显著的贡献。SM对KPNN的贡献的确定性可以预测，这为新物理学的重大发现提供了潜力，并具有灵敏度，可以探测各种质量尺度远远超出大型强子对撞机直接到达的新物理模型。NA62的目标是为KPNN在SM级别上观测80个事件提供灵敏度，覆盖大部分参数空间，供新物理模型贡献。它还研究许多其他罕见或禁止的反应，以寻找暗物质、重惰性中微子、中性介子衰变和辐射过程。此外，对类轴子和隐藏扇区粒子的搜索正在使用另一种操作模式进行研究。