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arXiv 2407.00520hep-ph
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家族非普适 $Z^{\prime}$ 模型对 $B\to(\rho,a_{1})\mu^{+}\mu^{-}$ 衰变角观测量中的影响

Effects of Family Non-universal $Z^{\prime}$ Model in the angular observables of $B\to(ρ,a_{1})μ^{+}μ^{-}$ decays

Nimra Farooq, Marwah Zaki, M. Ali Paracha, Faisal Munir Bhutta

AI总结:

本文在标准模型和家族非普适 $Z^{\prime}$ 模型中计算了 $B\to(\rho,a_{1})\mu^{+}\mu^{-}$ 衰变的角分布与相关观测量,发现该新物理模型在 $B\to\rho\mu^{+}\mu^{-}$ 衰变中的特征更显著,为未来实验检验提供了理论预言。

摘要:

我们给出了四重 $B\to\rho(\to\pi\pi)\mu^{+}\mu^{-}$ 和 $B\to a_{1}(\to\rho_{\parallel, \perp}\pi)\mu^{+}\mu^{-}$ 衰变在标准模型和家族非普适 $Z^{\prime}$ 模型中的角分布。在夸克层面,这些衰变由 $b\to d\mu^{+}\mu^{-}$ 跃迁主导。除了不同的角观测量外,我们还给出了微分分支比、前后不对称性、$\rho$ 和 $a_{1}$ 介子的纵向极化分数的预言。我们的分析表明,与 $B\to a_{1}(\to\rho_{\parallel, \perp}\pi)\mu^{+}\mu^{-}$ 衰变相比,家族非普适 $Z^{\prime}$ 模型的特征在与 $B\to\rho(\to\pi\pi)\mu^{+}\mu^{-}$ 衰变相关的观测量中更为显著。未来在当前和未来高能对撞机上对预言角观测量的测量,将为澄清 $|\Delta b|=|\Delta d|=1$ 过程中家族非普适 $Z^{\prime}$ 模型的结构提供有用的补充数据。

英文摘要:

We present the angular distribution of the four-fold $B\toρ(\toππ)μ^{+}μ^{-}$ and $B\to a_{1}(\toρ_{\parallel, \perp}π)μ^{+}μ^{-}$ decays both in the Standard Model and the family non-universal $Z^{\prime}$ model. At the quark level, these decays are governed by the $b\to dμ^{+}μ^{-}$ transition. Along with different angular observables, we also give predictions of differential branching ratios, forward-backward asymmetry, longitudinal polarization fraction of $ρ$, and $a_{1}$ mesons. Our analysis shows that the signatures of family non-universal $Z^{\prime}$ model are more distinct in the observables associated with the $B\toρ(\toππ)μ^{+}μ^{-}$ decay, compared to that of the $B\to a_{1}(\toρ_{\parallel, \perp}π)μ^{+}μ^{-}$ decay. Future measurements of the predicted angular observables, both at current and future high energy colliders, will add to the useful complementary data required to clarify the structure of the family non-universal $Z^{\prime}$ model in $|Δb|$=$|Δd|=1$ processes.

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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