论文标题
企鹅衰减的备注$ b_s \ to ϕ ϕ $带有fccee的潜在客户
Remarks on the penguin decay $B_s \to ϕϕ$ with prospects for FCCee
论文作者
论文摘要
从实验的角度来看，我们强调了向量 - 矢量企鹅衰减$ b_s \ to ϕ ϕ $的理论利益，从实验的角度来看。 CP-Violation不对称$ a_ {cp}^{mix} $来自混合和衰减$λ_{ϕ ϕ} = {q \ over p} {\ bar {a} \ a} $的干扰。在标准模型（SM）和幼稚的分解限制中，CP阶段的混合$ {q \ over p} $的CP恰好从衰减比$ {\ bar {a} \ a} $上取消了CP阶段。因此，此模式适合寻找可能的新物理（NP），因为$ a_ {cp}^{mix} $将直接表示混合中的SM偏离。我们通过分析SM中可能的小效应，尤其是使用QCD分解方案来估计与该取消的偏差。我们将$ a_ {cp}^{mix} $的理论期望与LHCB的测量结果以及对NP的含义进行了比较。我们还特别注意横向振幅$ h = - $，纵向和横向极化分数，以及有趣的螺旋依赖性可观察到$λ_{ϕ ϕ}^{h = 0} $和$λ__{ϕ ϕ}}}}^{h = - } $。另一方面，我们对CP相位的未来FCCEE实验的预期灵敏度进行了估计，而模量为$λ_{ϕ ϕ} $。我们发现$δ（\midλ_{ϕ ϕ} \ mid）= 0.004 $和$δ（ϕ_ {ϕ ϕ}）= 0.009 $ rad，与LHCB数据相比，我们指出了NP搜索时FCCEE的期望。
We underline the theoretical interest of the vector-vector penguin decay $B_s \to ϕϕ$, very clean from the experimental point of view. The CP-violation asymmetry $A_{CP}^{mix}$ comes from the interference of mixing and decay $λ_{ϕϕ} = {q \over p} {\bar{A} \over A}$. In the Standard Model (SM) and in the Naive Factorization limit, the CP phase from the mixing ${q \over p}$ exactly cancels the CP phase from the decay ratio ${\bar{A} \over A}$. Therefore, this mode is suitable to look for possible New Physics (NP) because $A_{CP}^{mix}$ would directly indicate the departure from the SM in mixing. We estimate the deviation from this cancellation by analyzing possible small effects in the SM, using in particular the QCD Factorization scheme. We compare the theoretical expectation for $A_{CP}^{mix}$ to the measurement of LHCb, and the implications for NP. We pay also special attention to the transverse amplitude $h = -$, the longitudinal and transverse polarization fractions, and the interesting helicity-dependent observables $λ_{ϕϕ}^{h=0}$ and $λ_{ϕϕ}^{h=-}$. On the other hand, we make an estimation of the expected sensitivity at the future FCCee experiment for the CP phase and modulus of $λ_{ϕϕ}$. We find $δ(\mid λ_{ϕϕ}\mid) = 0.004$ and $δ(ϕ_{ϕϕ}) = 0.009$ rad and, comparing to the LHCb data, we point out the expectations at FCCee in the search of NP.
