Correlating $B\to K^{(\ast)} ν\barν$ and flavor anomalies in SMEFT
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2024
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| _version_ | 1866917800281374720 |
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| author | Chen, Feng-Zhi Wen, Qiaoyi Xu, Fanrong |
| author_facet | Chen, Feng-Zhi Wen, Qiaoyi Xu, Fanrong |
| contents | The recent measurement of $\mathcal{B}(B^+\to K^+ν\barν)$ by Belle-II reveals a $2.8~σ$ deviation from the Standard Model (SM) prediction. Combining this with a prior Belle measurement of $\mathcal{B}(B^{0}\to K^{\ast0}ν\barν)$, the upper bound of the ratio $\mathcal{B}(B^{0}\to K^{\ast0}ν\barν)/\mathcal{B}(B^+\to K^+ν\barν)$ is notably smaller than the SM prediction. In this work, tensions are solved within the framework of Standard Model Effective Field Theory (SMEFT). Flavor observables, described by Low-Energy Effective Field Theory (LEFT) operators, are interconnected by SMEFT at the electroweak scale. Utilizing a set of only four SMEFT operators, the FCNC process $b\to sν\barν$ is correlated with $b\to s\ell^+\ell^-$, $b\to u_i\ell\barν$, $u_j\to s\ell\barν$, $u_j\to u_iν\barν$, and $u_j\to u_i\ell^+\ell^-$. Subsequently, we obtain the latest ranges of Wilson coefficients for these four operators through a global fit that accommodates flavor anomalies such as $R_{K^{(\ast)}}$, $R_{D^{(\ast)}}$, and $\mathcal{B}(B\to K^{(\ast)}ν\barν)$. Our findings reveal that predictions for $\mathcal{B}(B^+\to τ^+ν_τ)$ and $\mathcal{B}(D_s^+\to τ^+ν_τ)$ align well with measured values from Belle and BESIII, based on the fitted coefficients. The predicted branching fraction for $B^0\to K^{\ast0}ν\barν$ is $(1.42\pm 0.74)\times 10^{-5}$, closely approaching the current experimental upper limit. Anticipation surrounds the rare decay $B_s\to τ^+ τ^-$, expected in the near future with a branching fraction on the order of $10^{-4}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_11552 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Correlating $B\to K^{(\ast)} ν\barν$ and flavor anomalies in SMEFT Chen, Feng-Zhi Wen, Qiaoyi Xu, Fanrong High Energy Physics - Phenomenology Nuclear Theory The recent measurement of $\mathcal{B}(B^+\to K^+ν\barν)$ by Belle-II reveals a $2.8~σ$ deviation from the Standard Model (SM) prediction. Combining this with a prior Belle measurement of $\mathcal{B}(B^{0}\to K^{\ast0}ν\barν)$, the upper bound of the ratio $\mathcal{B}(B^{0}\to K^{\ast0}ν\barν)/\mathcal{B}(B^+\to K^+ν\barν)$ is notably smaller than the SM prediction. In this work, tensions are solved within the framework of Standard Model Effective Field Theory (SMEFT). Flavor observables, described by Low-Energy Effective Field Theory (LEFT) operators, are interconnected by SMEFT at the electroweak scale. Utilizing a set of only four SMEFT operators, the FCNC process $b\to sν\barν$ is correlated with $b\to s\ell^+\ell^-$, $b\to u_i\ell\barν$, $u_j\to s\ell\barν$, $u_j\to u_iν\barν$, and $u_j\to u_i\ell^+\ell^-$. Subsequently, we obtain the latest ranges of Wilson coefficients for these four operators through a global fit that accommodates flavor anomalies such as $R_{K^{(\ast)}}$, $R_{D^{(\ast)}}$, and $\mathcal{B}(B\to K^{(\ast)}ν\barν)$. Our findings reveal that predictions for $\mathcal{B}(B^+\to τ^+ν_τ)$ and $\mathcal{B}(D_s^+\to τ^+ν_τ)$ align well with measured values from Belle and BESIII, based on the fitted coefficients. The predicted branching fraction for $B^0\to K^{\ast0}ν\barν$ is $(1.42\pm 0.74)\times 10^{-5}$, closely approaching the current experimental upper limit. Anticipation surrounds the rare decay $B_s\to τ^+ τ^-$, expected in the near future with a branching fraction on the order of $10^{-4}$. |
| title | Correlating $B\to K^{(\ast)} ν\barν$ and flavor anomalies in SMEFT |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2401.11552 |