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| Main Authors: | , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2510.05272 |
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| _version_ | 1866909828701487104 |
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| author | Hu, Quan-Yi Duan, Zhi-Bin |
| author_facet | Hu, Quan-Yi Duan, Zhi-Bin |
| contents | In this work, we study the contribution of invisible light particles to $Λ_b \to ΛE_{\mathrm{miss}}$, particularly the three-body decays $Λ_b \to Λϕ\barϕ$ and $Λ_b \to Λψ\barψ$. The differential branching ratio of $Λ_b \to ΛE_{\mathrm{miss}}$ and the $q^2$-dependent longitudinal polarization asymmetry of $Λ$ in scenarios explaining the Belle II excess are presented. In the chiral basis, we investigate the correlations between $\mathcal{B}(B \to K E_{\mathrm{miss}})$ and $\mathcal{B}(Λ_b \to ΛE_{\mathrm{miss}})$, as well as between $\mathcal{B}(B \to K E_{\mathrm{miss}})$ and $P^Λ_{L}$, in eight distinct new physics scenarios. We find that the $P^Λ_{L}$ can be used to distinguish the chirality of the hadronic current part in the effective operators, which is similar to the cases in the two-body decays $Λ_b \to Λϕ$ and $Λ_b \to ΛV$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_05272 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The influence of invisible light particles on $Λ_b \to ΛE_{\mathrm{miss}}$ Hu, Quan-Yi Duan, Zhi-Bin High Energy Physics - Phenomenology In this work, we study the contribution of invisible light particles to $Λ_b \to ΛE_{\mathrm{miss}}$, particularly the three-body decays $Λ_b \to Λϕ\barϕ$ and $Λ_b \to Λψ\barψ$. The differential branching ratio of $Λ_b \to ΛE_{\mathrm{miss}}$ and the $q^2$-dependent longitudinal polarization asymmetry of $Λ$ in scenarios explaining the Belle II excess are presented. In the chiral basis, we investigate the correlations between $\mathcal{B}(B \to K E_{\mathrm{miss}})$ and $\mathcal{B}(Λ_b \to ΛE_{\mathrm{miss}})$, as well as between $\mathcal{B}(B \to K E_{\mathrm{miss}})$ and $P^Λ_{L}$, in eight distinct new physics scenarios. We find that the $P^Λ_{L}$ can be used to distinguish the chirality of the hadronic current part in the effective operators, which is similar to the cases in the two-body decays $Λ_b \to Λϕ$ and $Λ_b \to ΛV$. |
| title | The influence of invisible light particles on $Λ_b \to ΛE_{\mathrm{miss}}$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2510.05272 |