2024/07/18 by Grossman, Yuval, Nir, Yosef, Neubert, Matthias +2
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2407.13506
Within the Standard Model, the branching fraction of the rare decay Bs→ K0 K0 is related to other decay rates and CP asymmetries through the approximate SU(3) flavor symmetry of the strong interactions and the heavy-quark limit. Three such relations were shown to be violated at a level of about 3σ each. By means of a systematic search for new-physics explanations of these puzzles, we find that possible solutions are highly fine-tuned and either excluded by other data or rather implausible. The tight correlation between Bs→ K K and B→πK decays, which is maintained even in the presence of flavor-specific new-physics operators, plays a central role in our analysis.