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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.18147 |
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| _version_ | 1866908788683964416 |
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| author | Yan, Xin-Shuai Liu, Wen-Feng Chang, Qin Yang, Ya-Dong |
| author_facet | Yan, Xin-Shuai Liu, Wen-Feng Chang, Qin Yang, Ya-Dong |
| contents | The recent evidence for the decay $B^+ \to K^+ ν\barν$ reported by the Belle II collaboration, combined with the existing constraints on the neutral mode $B^0 \to K^{*0} ν\barν$, implies a deviation from the Standard Model prediction that necessitates New Physics contributions to both left- and right-handed vector currents. We perform a systematic topological classification of renormalizable one-loop completions capable of generating the required dimension-six operators while forbidding tree-level mediation. Based on this classification, we identify and construct two minimal benchmark scenarios -- a scalar-rich model and a fermion-rich model -- and perform a comprehensive phenomenological analysis. Our study demonstrates that while these one-loop models can yield enhancements in the $b \to s ν\barν$ branching fractions, the attainable magnitudes are significantly restricted by the combined effects of loop suppression and complementary flavor constraints, limiting their ability to fully accommodate the current anomaly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_18147 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Systematic classification of one-loop models addressing the $b \to s ν\barν$ anomaly Yan, Xin-Shuai Liu, Wen-Feng Chang, Qin Yang, Ya-Dong High Energy Physics - Phenomenology The recent evidence for the decay $B^+ \to K^+ ν\barν$ reported by the Belle II collaboration, combined with the existing constraints on the neutral mode $B^0 \to K^{*0} ν\barν$, implies a deviation from the Standard Model prediction that necessitates New Physics contributions to both left- and right-handed vector currents. We perform a systematic topological classification of renormalizable one-loop completions capable of generating the required dimension-six operators while forbidding tree-level mediation. Based on this classification, we identify and construct two minimal benchmark scenarios -- a scalar-rich model and a fermion-rich model -- and perform a comprehensive phenomenological analysis. Our study demonstrates that while these one-loop models can yield enhancements in the $b \to s ν\barν$ branching fractions, the attainable magnitudes are significantly restricted by the combined effects of loop suppression and complementary flavor constraints, limiting their ability to fully accommodate the current anomaly. |
| title | Systematic classification of one-loop models addressing the $b \to s ν\barν$ anomaly |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.18147 |