Are the new particles heavy or light in $$b \rightarrow s E_{\textrm{miss}}$$ b → s E miss ?
Abstract In this work, we study the $$B^+\rightarrow K^+ E_{\textrm{miss}}$$ B + → K + E miss , $$B^0\rightarrow K^{*0} E_{\textrm{miss}}$$ B 0 → K ∗ 0 E miss , and $$\Lambda _b^0\rightarrow \Lambda ^0 E_{\textrm{miss}}$$ Λ b 0 → Λ 0 E miss decays under three different new physics hypotheses: the he...
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-025-14290-y |
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| Summary: | Abstract In this work, we study the $$B^+\rightarrow K^+ E_{\textrm{miss}}$$ B + → K + E miss , $$B^0\rightarrow K^{*0} E_{\textrm{miss}}$$ B 0 → K ∗ 0 E miss , and $$\Lambda _b^0\rightarrow \Lambda ^0 E_{\textrm{miss}}$$ Λ b 0 → Λ 0 E miss decays under three different new physics hypotheses: the heavy new particles, the light neutral vector particles, and the axion-like particles. We find that all three hypotheses can resolve the Belle-II excess, and they can be clearly distinguished by the longitudinal polarization fraction of $$K^*$$ K ∗ . Furthermore, we discover that the longitudinal polarization fraction of $$\Lambda $$ Λ can be used to distinguish the chirality of the effective operators. |
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| ISSN: | 1434-6052 |