B s → K 0 K ¯ 0 $$ {B}_s\to {K}^0{\overline{K}}^0 $$ beyond the Standard Model
Abstract Within the Standard Model, the branching fraction of the rare decay B s → K 0 K ¯ 0 $$ {B}_s\to {K}^0{\overline{K}}^0 $$ 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 relation...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-05-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP05(2025)210 |
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| Summary: | Abstract Within the Standard Model, the branching fraction of the rare decay B s → K 0 K ¯ 0 $$ {B}_s\to {K}^0{\overline{K}}^0 $$ 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 B s → K K ¯ $$ {B}_s\to K\overline{K} $$ and B → πK decays, which is maintained even in the presence of flavor-specific new-physics operators, plays a central role in our analysis. |
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| ISSN: | 1029-8479 |