Cirigliano, Vincenzo; Crivellin, Andreas; Hoferichter, Martin; Moulson, Matthew (2023). Scrutinizing CKM unitarity with a new measurement of the K3/K2 branching fraction. Physics letters. B, 838, p. 137748. Elsevier 10.1016/j.physletb.2023.137748
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Precision tests of first-row unitarity of the Cabibbo–Kobayashi–Maskawa matrix currently display two intriguing tensions, both at the 3σ level. First, combining determinations of
from superallowed β decays with
from kaon decays suggests a deficit in the unitarity relation. At the same time, a tension of similar significance has emerged between
and
decays. In this Letter, we point out that a measurement of the
branching fraction at the level of 0.2% would have considerable impact on clarifying the experimental situation in the kaon sector, especially in view of tensions in the global fit to kaon data as well as the fact that the
channel is currently dominated by a single experiment. Such a measurement, as possible for example at NA62, would further provide important constraints on physics beyond the Standard Model, most notably on the role of right-handed vector currents.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Hoferichter, Martin |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0370-2693 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Binia Marti |
Date Deposited: |
17 Mar 2023 15:06 |
Last Modified: |
17 Mar 2023 23:27 |
Publisher DOI: |
10.1016/j.physletb.2023.137748 |
BORIS DOI: |
10.48350/179696 |
URI: |
https://boris.unibe.ch/id/eprint/179696 |
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