Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

• DOI: 10.1007/jhep12(2016)052
• Publication Date: 2016-12-15T04:17:15Z
• Authors: Martín González-A...; Jorge Martin Cama...
• Keywords: Nuclear and High Energy Physics; High Energy Physics - Phenomenology; High Energy Physics - Experiment (hep-ex); High Energy Physics - Lattice; High Energy Physics - Phenomenology (hep-ph); [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat]; [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]; High Energy Physics - Lattice (hep-lat); [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; 115; FOS: Physical sciences; High Energy Physics - Experiment

We analyze the decays $K\to��\ell��$ and $P\to\ell��$ ($P=K,��$, $\ell=e,\,��$) using a low-energy Effective-Field-Theory approach to parametrize New Physics and study the complementarity with baryon $��$ 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.<br/>45 pages, 4 figures; v2: minor changes to match version published in JHEP<br/>