Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on $V_{td}/V_{ts}$ and ${\epsilon }^{\prime }/\epsilon$: Summary of CKM 2018 working group 3

Abstract

Rare $B$, $D$ and $K$ decays provide interesting probes of the Standard Model (SM), with a potential sensitivity to New Physics (NP) higher than other, more common, decays. Their experimental measurement is challenging, and their theoretical interpretation requires a precise knowledge of QCD at low energies, in the non-perturbative (hadronic) regime. The various $b$, $c$, $s$ decays provide different types of tests of the Standard Model, which can be performed in different experimental settings and which may exhibit correlated deviations in models of New Physics.

arXiv commentProceedings of the 10th International Workshop on the CKM Unitarity Triangle (CKM 2018), Heidelberg, Germany, September 17-21, 2018

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• First exploratory calculation of the long-distance contributions to the rare kaon decays $K\to \pi {\ell }^{+}{\ell }^{-}$
• Observation of the Semileptonic Decay $D^0\to a_0(980{)}^{-}{e}^{+}{\nu }_e$ and Evidence for $D^{+}\to a_0(980{)}^0{e}^{+}{\nu }_e$
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• Search for the Radiative Leptonic Decay $D^{+}\to \gamma e^{+}{\nu }_e$
• Subleading Power Factorization in $\bar{B}\to X_s{\ell }^{+}{\ell }^{-}$
• Search for lepton-flavour-violating decays of Higgs-like bosons
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