Correlating $B\to K^{(\ast)} ν\barν$ and flavor anomalies in SMEFT

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Hauptverfasser: Chen, Feng-Zhi, Wen, Qiaoyi, Xu, Fanrong
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Veröffentlicht: 2024
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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
id 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