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PreprintarXiv licencearXiv

KOFFEE: Kaon Observables at Future Fermilab Experimental Extensions

  • Cari Cesarotti
  • Samuel Homiller
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Abstract

The rare decays K+→π+νν̅ and KL→π0νν̅ 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 𝒪(100) TeV, and determine the unitarity triangle from kaon processes alone. All this can be achieved while sharing infrastructure with other frontier programs.

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Cite

BibTeXRIS
BibTeX
@misc{cesarotti2026koffee,
  title = {{KOFFEE: Kaon Observables at Future Fermilab Experimental Extensions}},
  author = {Cari Cesarotti and Samuel Homiller},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.27558},
  eprint = {2608.27558},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.27558},
}
RIS
TY  - UNPB
TI  - KOFFEE: Kaon Observables at Future Fermilab Experimental Extensions
AU  - Cari Cesarotti
AU  - Samuel Homiller
PY  - 2026
DA  - 2026/08/27
PB  - arXiv
DO  - 10.48550/arxiv.2608.27558
UR  - https://arxiv.org/abs/2608.27558
AB  - The rare decays K^+→π^+νν̅ and K_L→π^0νν̅ 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 𝒪(100) TeV, and determine the unitarity triangle from kaon processes alone. All this can be achieved while sharing infrastructure with other frontier programs.
ER  -