Year: 2026
Type: preprint
Abstract: We investigate how one-loop operator mixing reshapes the flavor sensitivity of lepton-number-violating dimension-7 SMEFT interactions. Using both bottom-up and top-down EFT approaches, we study the interplay of neutrinoless double beta decay ($0νββ$) and neutral current rare meson decays $K\toπνν$, and $B\to K^{(*)}νν$, which at tree level probe apparently disconnected quark- and lepton-flavor sectors. We show that loop mixing qualitatively changes this picture: flavor structures radiatively feed into one another, substantially extending the sensitivity to higher new-physics scales across operators and flavors. In the bottom-up EFT approach, this can make $0νββ$ highly sensitive even to operators involving heavier-generation quarks, while rare kaon and $B$ decays retain crucial complementary sensitivity to other flavor combinations. A top-down EFT approach example using a ultraviolet model involving scalar-leptoquark illustrates how the same effects can reorder the relative importance of different observables.
Source: arXiv (Cornell University)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G103507813, G1097174855, G1105844351, G1272900390, G1422035950, G1610934229, G2931447263, G3176647223, G3220251042, G3565621276, G3857581125, G3955344295, G4014979219, G4511208782, G491712853, G5222023348, G5635532810, G5987630651, Network for Neutrinos, Nuclear Astrophysics, and Symmetries, G7101642908, G7217908870, G7805626310, G7863371703, G8497050386, G8715457421, G8877897358
OpenAlex ID: W7214214884