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| Format: | Preprint |
| Veröffentlicht: |
2023
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| Online-Zugang: | https://arxiv.org/abs/2308.13426 |
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| _version_ | 1866913235458850816 |
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| author | Athron, Peter Martinez, R. Sierra, Cristian |
| author_facet | Athron, Peter Martinez, R. Sierra, Cristian |
| contents | In view of both the latest LHCb measurement of $R_{K^{(*)}}$ and the new $2.8σ$ deviation reported by Belle II on $B^{+}\to K^{+}ν\barν$ decays, we present a fit to the $B$ meson anomalies for various one and two dimensional hypothesis including complex Wilson coefficients. We show in a model-independent way that the generic non-universal $U(1)^{\prime}$ extensions of the SM, without flavour violation, fail to simultaneously fit those observables and corroborate that they can modify $\mathrm{BR}(B^{+}\to K^{+}ν\barν)$ up to only a $10\%$. In view of this deficit, we propose a new way in which those models can accommodate the data at tree level by introducing lepton flavour violating couplings and non-diagonal elements of the charged lepton mixing matrix, with implications in future charged lepton flavour violation searches. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_13426 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | $B$ meson anomalies and large $B^{+}\to K^{+}ν\barν$ in non-universal $U(1)^\prime$ models Athron, Peter Martinez, R. Sierra, Cristian High Energy Physics - Phenomenology In view of both the latest LHCb measurement of $R_{K^{(*)}}$ and the new $2.8σ$ deviation reported by Belle II on $B^{+}\to K^{+}ν\barν$ decays, we present a fit to the $B$ meson anomalies for various one and two dimensional hypothesis including complex Wilson coefficients. We show in a model-independent way that the generic non-universal $U(1)^{\prime}$ extensions of the SM, without flavour violation, fail to simultaneously fit those observables and corroborate that they can modify $\mathrm{BR}(B^{+}\to K^{+}ν\barν)$ up to only a $10\%$. In view of this deficit, we propose a new way in which those models can accommodate the data at tree level by introducing lepton flavour violating couplings and non-diagonal elements of the charged lepton mixing matrix, with implications in future charged lepton flavour violation searches. |
| title | $B$ meson anomalies and large $B^{+}\to K^{+}ν\barν$ in non-universal $U(1)^\prime$ models |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2308.13426 |