nLab Cabibbo anomaly

Idea

(…)

apparent observed violation of unitarity of the CKM matrix

(…)

Statistical significance

statistical significance:

$\gt 4\sigma$ (Belfatto-Beradze-Berezhiani 19)

Related concepts

• flavor problem

• flavour anomaly

• (g-2) anomaly

• V_cb puzzle

References

• Benedetta Belfatto, Revaz Beradze, Zurab Berezhiani, The CKM unitarity problem: A trace of new physics at the TeV scale?, Eur. Phys. J. C 80, 149 (2020) (arXi:1906.02714, arXiv:10.1140/epjc/s10052-020-7691-6)

• Yuval Grossman, Emilie Passemar, Stefan Schacht, On the Statistical Treatment of the Cabibbo Angle Anomaly (arXiv:1911.07821)

• Matthew Kirk, Cabibbo anomaly versus electroweak precision tests: An exploration of extensions of the Standard Model, Phys. Rev. D 103, 035004 (2021) (arXiv:2008.03261)

A leptoquark model meant to address all of the flavour anomalies, the (g-2)-anomaly and the Cabibbo anomaly at once:

• David Marzocca, Sokratis Trifinopoulos, A Minimal Explanation of Flavour Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabbibo Angle (arXiv:2104.05730)

See also:

• Andreas Crivellin, Explaining the Cabibbo Angle Anomaly [arXiv:2207.02507]