In pursuit of new physics with and decays at the high-precision Frontier,Journal of Physics G: Nuclear and Particle Physics

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In pursuit of new physics with and decays at the high-precision Frontier
Journal of Physics G: Nuclear and Particle Physics ( IF 3.5 ) Pub Date : 2021-04-27 , DOI: 10.1088/1361-6471/abf2a2
Marten Z Barel ₁ , Kristof De Bruyn _{1,

2} , Robert Fleischer _{1,

3} , Eleftheria Malami ₁

Affiliation

The decays ${B}_{d}^{0}\to J/\psi {K}_{\text{S}}^{0}$ and ${B}_{s}^{0}\to J/\psi \phi$ play a key role for the determination of the ${B}_{q}^{0}$ – ${\bar{B}}_{q}^{0}$ (q = d, s) mixing phases ϕ _d and ϕ _s, respectively. The theoretical precision of the extraction of these quantities is limited by doubly Cabibbo-suppressed penguin topologies, which can be included through control channels by means of the SU(3) flavour symmetry of strong interactions. Using the currently available data and a new simultaneous analysis, we discuss the state-of-the-art picture of these effects and include them in the extracted ϕ _q values. We have a critical look at the standard model predictions of these phases and explore the room left for new physics. Considering future scenarios for the high-precision era of flavour physics, we illustrate that we may obtain signals for physics beyond the standard model with a significance well above five standard deviations. We also determine effective colour-suppression factors of ${B}_{d}^{0}\to J/\psi {K}^{0}$ , ${B}_{s}^{0}\to J/\psi {K}_{\text{S}}^{0}$ and ${B}_{d}^{0}\to J/\psi {\pi }^{0}$ decays, which serve as benchmarks for QCD calculations of the underlying decay dynamics, and present a new method using information from semileptonic ${B}_{d}^{0}\to {\pi }^{-}{\ell }^{+}{\nu }_{\ell }$ and ${B}_{s}^{0}\to {K}^{-}{\ell }^{+}{\nu }_{\ell }$ decays.

中文翻译：

在高精度前沿追求新物理 ${B}_{d}^{0}\mathbf{\to }J\mathbf{/}\boldsymbol{\psi {K}^{0}$ 和 ${B}_{s}^{0}\mathbf{\to }J\mathbf{/}\boldsymbol{\psi }\boldsymbol{\phi }$ 衰变

衰变 ${B}_{d}^{0}\to J/\psi {K}_{\text{S}}^{0}$ 和 ${B}_{s}^{0}\to J/\psi \phi$ 发挥关键作用为的测定 ${B}_{q}^{0}$ - ${\bar{B}}_{q}^{0}$ （q = d，š）混合相φ _d和φ_小号分别。提取这些量的理论精度受到双重 Cabibbo 抑制企鹅拓扑结构的限制，可以通过控制通道通过强相互作用的SU (3) 风味对称性将其包含在内。使用当前可用的数据和新的同步分析，我们讨论了这些影响的最新图片，并将它们包含在提取的ϕ _{q 中} 值。我们批判性地审视了这些阶段的标准模型预测，并探索为新物理学留下的空间。考虑到风味物理高精度时代的未来场景，我们说明我们可以获得超出标准模型的物理信号，其显着性远高于五个标准偏差。我们还确定了和衰变的有效颜色抑制因子 ${B}_{d}^{0}\to J/\psi {K}^{0}$ ，作为基础衰变动力学 QCD 计算的基准，并提出了一种使用半轻和衰变信息的新方法。 ${B}_{s}^{0}\to J/\psi {K}_{\text{S}}^{0}$ ${B}_{d}^{0}\to J/\psi {\pi }^{0}$ ${B}_{d}^{0}\to {\pi }^{-}{\ell }^{+}{\nu }_{\ell }$ ${B}_{s}^{0}\to {K}^{-}{\ell }^{+}{\nu }_{\ell }$

更新日期：2021-04-27

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