$Λ_b \to Λ^{(\ast)}ν\barν$ decays and the recent Belle-II $B^+\to K^+ν\barν$ data
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| Format: | Preprint |
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2025
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| _version_ | 1866912524488671232 |
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| author | Das, Diganta Shameer, Dargi Sain, Ria |
| author_facet | Das, Diganta Shameer, Dargi Sain, Ria |
| contents | The Belle-II experiment has recently reported the first measurement of $B^+ \to K^+ ν\barν$ decay which exceeds the Standard Model prediction by approximately 2.7$σ$. The deviation may indicate the presence of new physics beyond the Standard Model in the $b\to sν\barν$ sector. Under this assumption, we study the hadronic $Λ_b \to Λ(\to pπ)ν\barν$ and $Λ_b \to Λ^\ast(\to N\!\bar{K})ν\barν$ decays within both the Standard Model and beyond. We work in a low energy effective field theory framework with additional light right-handed neutrinos. We calculate the differential branching ratios of these decay modes and explore the implications of the Belle-II results through various observables. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_01863 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $Λ_b \to Λ^{(\ast)}ν\barν$ decays and the recent Belle-II $B^+\to K^+ν\barν$ data Das, Diganta Shameer, Dargi Sain, Ria High Energy Physics - Phenomenology The Belle-II experiment has recently reported the first measurement of $B^+ \to K^+ ν\barν$ decay which exceeds the Standard Model prediction by approximately 2.7$σ$. The deviation may indicate the presence of new physics beyond the Standard Model in the $b\to sν\barν$ sector. Under this assumption, we study the hadronic $Λ_b \to Λ(\to pπ)ν\barν$ and $Λ_b \to Λ^\ast(\to N\!\bar{K})ν\barν$ decays within both the Standard Model and beyond. We work in a low energy effective field theory framework with additional light right-handed neutrinos. We calculate the differential branching ratios of these decay modes and explore the implications of the Belle-II results through various observables. |
| title | $Λ_b \to Λ^{(\ast)}ν\barν$ decays and the recent Belle-II $B^+\to K^+ν\barν$ data |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.01863 |