$B^+\to K^+ ν\barν$ Excess and DM semi-annihilation
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911286390947840 |
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| author | Kim, Jongkuk Ko, Pyungwon |
| author_facet | Kim, Jongkuk Ko, Pyungwon |
| contents | In 2023, Belle II collaboration announced the observarion of the $B^+ \to K^+ ν\barν$ decay channel for the first time. This decay channel provides a clean signal with high precision in theoretical calculation. However, we encounter $2.8σ$ deviation from the Standard Model (SM) prediction. To resolve this excess, we study scalar dark matter (DM) model with local discrete $Z_3$ symmetry. Assuming dark $U(1)_X \equiv U(1)_{L_μ- L_τ}$ symmetry, this $U(1)_{L_μ- L_τ}$ symmetry is spontaneously broken into local discrete $Z_3$ by non-zero vacuum expectation value of dark Higgs boson. Considering dark Higgs mass is $2$GeV, we can explain the recent ${\rm Br} (B^+ \to K^+ ν\barν)$ excess reported from Belle II collaboration and relic abundance at the same time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_20430 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $B^+\to K^+ ν\barν$ Excess and DM semi-annihilation Kim, Jongkuk Ko, Pyungwon High Energy Physics - Phenomenology In 2023, Belle II collaboration announced the observarion of the $B^+ \to K^+ ν\barν$ decay channel for the first time. This decay channel provides a clean signal with high precision in theoretical calculation. However, we encounter $2.8σ$ deviation from the Standard Model (SM) prediction. To resolve this excess, we study scalar dark matter (DM) model with local discrete $Z_3$ symmetry. Assuming dark $U(1)_X \equiv U(1)_{L_μ- L_τ}$ symmetry, this $U(1)_{L_μ- L_τ}$ symmetry is spontaneously broken into local discrete $Z_3$ by non-zero vacuum expectation value of dark Higgs boson. Considering dark Higgs mass is $2$GeV, we can explain the recent ${\rm Br} (B^+ \to K^+ ν\barν)$ excess reported from Belle II collaboration and relic abundance at the same time. |
| title | $B^+\to K^+ ν\barν$ Excess and DM semi-annihilation |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.20430 |