AI 中文总结
本文提出费米实验室利用在建高强度质子复合体开展KOFFEE稀有K介子项目，可高精度测量K介子黄金衰变模式，探测100 TeV量级新物理，仅通过K介子过程确定幺正三角形，且可共享基础设施。
AI 中文摘要
稀有衰变过程$K^+\to\pi^+\nu\bar\nu$与$K_L\to\pi^0\nu\bar\nu$是预测精度最高的味物理可观测量之一，可用于确定CKM矩阵及其CP破坏相位，还能对远高于对撞机可达能标的新物理产生敏感性。我们提出在费米实验室开展一项专用的稀有K介子实验项目，利用该实验室正在建造的用于中微子项目及潜在对撞机研发的高强度质子复合体。本研究中，我们估算了可实现的K介子通量，并对上述K介子黄金衰变模式的灵敏度进行了预测，同时采用有效场论（EFT）框架评估了对紫外新动力学的探测能力。该项目可以前所未有的精度测量两种衰变模式，探测最高达$\mathcal{O}(100)$ TeV的新物理，还能仅通过K介子过程确定幺正三角形，且所有成果可在与其他前沿项目共享基础设施的情况下实现。
英文摘要
The rare decays $K^+\toπ^+ν\barν$ and $K_L\toπ^0ν\barν$ are among the most precisely predicted flavor observables, enabling determinations of the CKM matrix and its CP-violating phase, as well as providing sensitivity to new physics at scales far beyond the reach of colliders. We propose a dedicated rare-kaon program at Fermilab, exploiting the high-intensity proton complex currently under construction for its neutrino programs and potential collider R&D. In this letter, we estimate the achievable kaon flux and project the sensitivity to the aforementioned kaon golden modes, as well as the reach on new dynamics in the UV with an EFT framework. Such a program could measure both modes with unprecedented precision, probe new physics up to $\mathcal{O}(100)$ TeV, and determine the unitarity triangle from kaon processes alone. All this can be achieved while sharing infrastructure with other frontier programs.
Comments6 + 4 pages, 3 + 4 figures
