Global Effective-Field-Theory analysis of New-Physics effects in (semi)leptonic kaon decays

Abstract

We analyze the decays $K\to \pi \ell \nu$ and $P\to \ell \nu$ ($P=K,\pi$, $\ell =e,\mu$) using a low-energy Effective-Field-Theory approach to parametrize New Physics and study the complementarity with baryon $\beta$ decays. We then provide a road map for a global analysis of the experimental data, with all the Wilson coefficients simultaneously, and perform a fit leading to numerical bounds for them and for $V_{us}$. A prominent result of our analysis is a reinterpretation of the well-known $V_{ud}-V_{us}$ diagram as a strong constraint on new physics. Finally, we reinterpret our bounds in terms of the $SU(2{)}_L\times U(1{)}_Y$-invariant operators, provide bounds to the corresponding Wilson coefficients at the TeV scale and compare our results with collider searches at the LHC.

45 pages, 4 figures; v2: minor changes to match version published in JHEP

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