Dark Matter emission at Belle II and NA62 in Minimal Flavor Violation framework

Abstract

Minimal Flavor Violation (MFV) provides a compelling framework for exploring physics beyond the Standard Model, in which new QCD-singlet fields transforming under the global $\mathrm{SU}(3{)}^3$ quark flavor symmetry can naturally be stable and act as dark matter (DM) candidates. We show that the DM-MFV framework naturally accommodates the excess in either $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ or $B^{+}\to K^{+}\nu \bar{\nu }$, while a unified explanation of both channels simultaneously cannot be achieved within a minimal setup containing only a single dark matter multiplet with nearly degenerate masses. Overall, our findings underscore the intricate interplay between MFV-based model building, flavored dark matter scenarios, and precision flavor experiments, highlighting flavored dark matter as a framework that is both theoretically robust and experimentally testable.

Comments: 26 pages, 2 figures. Matched to the published version