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：
$ 12.97万
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：
2022
资助国家：
加拿大
起止时间：
2022-01-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762942
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CERN实验Na62上，超稀有的kaon衰变K+ kaon衰减K+ kaon decay k+ to+ pi+中微子抗神经（kpnn）是夸克风味物理学最尖锐的探针之一。分支比对新的物理模型敏感，不容易通过扩展标准模型（SM）来解决其大量问题的其他反应访问。在5％的水平上，KPNN分支分数的SM预测在理论上是健壮的。只有少数可访问的第二阶弱相互作用夸克过程可以通过这种确定性来预测。 SM中KPNN分支分支到10-10级的抑制允许SM超出SM的物理学对分支分数做出巨大贡献。可以预测，SM对KPNN的贡献的确定性允许具有敏感性的新物理学的显着发现潜力，可以探究各种具有质量尺度的新物理模型，远远超出了大型强子对撞机的直接范围。 NA62的目标是敏感性，以在SM级别观察80个事件，以涵盖新物理模型的大部分参数空间。它还研究了许多其他罕见或禁止的反应，以寻找暗物质，沉重的无菌中微子，中性斜腐腐烂和辐射过程。此外，正在使用替代操作模式研究搜索类似轴突的和隐藏的扇形颗粒。