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PreprintCC BY 4.0arXiv

A CKM blind spot: probing b-column rescaling with kaons

  • Avital Dery
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Abstract

CKM unitarity triangle constraints are insensitive to New Physics scenarios in which the b-column is uniformly rescaled. This is because B physics data over-constrain the angles of the (bd) unitarity triangle, but only calibrate its normalization. We identify this flat direction and derive model-independent constraints on the rescaling. We find that |εK| already constrains the rescaling at the same level as the direct measurement of the b-column normalization, with current data allowing for cal O(4%) deviations. Projected inputs promote the kaon sector to be the leading probe. A toy model employing mixing with a vector-like up-type singlet provides a proof of principle for a possible UV realization.

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Cite

BibTeXRIS
BibTeX
@misc{dery2026blind,
  title = {{A CKM blind spot: probing $b$-column rescaling with kaons}},
  author = {Avital Dery},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2607.13136},
  eprint = {2607.13136},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.13136},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - A CKM blind spot: probing b-column rescaling with kaons
AU  - Avital Dery
PY  - 2026
DA  - 2026/10/06
PB  - arXiv
DO  - 10.48550/arxiv.2607.13136
UR  - https://arxiv.org/abs/2607.13136
AB  - CKM unitarity triangle constraints are insensitive to New Physics scenarios in which the b-column is uniformly rescaled. This is because B physics data over-constrain the angles of the (bd) unitarity triangle, but only calibrate its normalization. We identify this flat direction and derive model-independent constraints on the rescaling. We find that |ε_K| already constrains the rescaling at the same level as the direct measurement of the b-column normalization, with current data allowing for cal O(4%) deviations. Projected inputs promote the kaon sector to be the leading probe. A toy model employing mixing with a vector-like up-type singlet provides a proof of principle for a possible UV realization.
ER  -