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arXiv 2312.05071hep-ph
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带电轻子味破坏的$B$介子衰变的SMEFT分析

SMEFT analysis of charged lepton flavor violating $B$-meson decays

Md Isha Ali, Utpal Chattopadhyay, N Rajeev, Joydeep Roy

AI总结:

在SMEFT框架下分析带电轻子味破坏的B介子衰变,研究相关Wilson系数与其他cLFV过程的关联,并给出新物理能标约束及未来实验可达到的分支比灵敏度提升范围。

摘要:

在标准模型有效场论(SMEFT)框架下,分析了带电轻子味破坏(cLFV)过程,这些过程可能对各种超出标准模型的物理场景具有重要意义。我们考虑了最相关的2夸克-2轻子$(2q2\ell)$算符,用于轻子型和半轻子型LFV $B$衰变(LFVBD)过程$B_s\to μ^+e^-$、$B^+\to K^+μ^+e^-$、$B^0\to K^{*0}μ^+ e^-$以及$B_s\to ϕμ^-e^+$。我们分析了这些LFVBD以及其他cLFV过程(如$\rm CR (μ\to e)$、$\ell_i \to \ell_j γ$、$\ell_i \to\ell_j\ell_k\ell_m$和$Z \to \ell_i \ell_j$)中Wilson系数之间的相互作用,以寻找$B$介子衰变中最大可能的LFV效应。我们结合当前约束和未来预期,探测了与两类LFV衰变约束相关的新物理能标。鉴于LHCb-II和Belle II上拟议的带电LFV过程实验,我们还提供了此类LFVBD间接约束的上限。对于$B$介子衰变到$μ^{\pm}$和$e^{\mp}$的过程,我们表明新物理可以通过将$B^+\to K^+μ^+e^-$、$B^0\to K^{*0}μ^+ e^-$和$B_s\toϕμ^{\pm}e^{\mp}$的当前分支比灵敏度提高2-4个数量级来加以约束。

英文摘要:

Charged lepton flavor violation (cLFV) processes, potentially important for various Beyond the Standard Model Physics scenarios are analyzed in the Standard Model Effective Field Theory (SMEFT) framework. We consider the most relevant 2 quark-2 lepton $(2q2\ell)$ operators for the leptonic and semi-leptonic LFV B-decay (LFVBD) processes $B_s\to μ^+e^- , B^+\to K^+μ^+e^-, B^0\to K^{*0}μ^+ e^-, {\rm and}~ B_s\to ϕμ^-e^+$. We analyse the interplay among the Wilson coefficients responsible for these LFVBDs and other cLFV processes like $\rm CR (μ\to e)$, $\ell_i \to \ell_j γ$, $\ell_i \to\ell_j\ell_k\ell_m$ and $Z \to \ell_i \ell_j$, to find the maximal possible LFV effects in $B$-meson decays. We probe the scale of new physics in relation to the constraints imposed by both classes of the LFV decays while considering both the present bounds and future expectations. In view of proposed experiments at LHCb-II and Belle II to study charged LFV processes, we have also provided the upper limits on the indirect constraints on such LFVBDs. For the processes where $B$ meson is decaying to $μ^{\pm}$ and $e^{\mp}$, we show that new physics can be constrained by an enhancement of 2-4 orders of magnitude on the current sensitivities of the BRs of $B^+\to K^+μ^+e^-, B^0\to K^{*0}μ^+ e^- {\rm and}~ B_s\toϕμ^{\pm}e^{\mp}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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