论文标题
$ b_ {s} \ rightarrow j/ψϕ $ channel在未来的z工厂中的CP侵略阶段$ ϕ_s $的测量前景
Prospect for measurement of the CP-violating phase $ϕ_s$ in the $B_{s}\rightarrow J/ψϕ$ channel at a future Z factory
论文作者
论文摘要
CP-violating阶段$ ϕ_s $，\ bs衰减宽度（$γ_s$）和\ bs衰减宽度差异（$δγ_S$）是对新物理学的敏感探针，并且可以限制重型夸克膨胀理论。在本手稿中研究了未来$ z $工厂的测量潜力。发现在tera- $ z $模式下运行，预期的精度可以达到：$σ（ϕ_s）= 4.6〜 \ mathrm {mrad} $，$σ（δγ_S）= 2.4〜 \ mathrm {ns^{ - 1}}} $ and $σ（γ_S） $ ϕ_s $的精度比HL-LHC的LHCB实验的预期精度高40 \％。如果以10-tera- $ z $模式运行，则可以以HL-LHC的LHCB实验获得的精度的45 \％测量$ ϕ_s $的精度。但是，$γ_s$和$Δγ_S$的测量无法从未来$ z $ - factories的出色时间分辨率和标记功率中受益。只有在10-tera- $ z $模式下运行的$γ_s$和$δγ_s$才能比预期从HL-LHC获得的LHCB获得的精度高18 \％。还讨论了未来Z因子的企鹅污染的控制。
The CP-violating phase $ϕ_s$, the \Bs decay width ($Γ_s$), and the \Bs decay width difference ($ΔΓ_s$) are sensitive probes to new physics and can constrain the heavy quark expansion theory. The potential for the measurement at future $Z$ factories is studied in this manuscript. It is found that operating at Tera-$Z$ mode, the expected precision can reach: $σ(ϕ_s) = 4.6~\mathrm{mrad}$, $σ(ΔΓ_s) = 2.4~\mathrm{ns^{-1}}$ and $σ(Γ_s) = 0.72~\mathrm{ns^{-1}}$. The precision of $ϕ_s$ is 40\% larger than the expected precision with the LHCb experiment at HL-LHC. If operating at 10-Tera-$Z$ mode, the precision of $ϕ_s$ can be measured at 45\% of the precision obtained from the LHCb experiment at HL-LHC. However, the measurement of $Γ_s$ and $ΔΓ_s$ cannot benefit from the excellent time resolution and tagging power of the future $Z$-factories. Only operating at 10-Tera-$Z$ mode can the $Γ_s$ and $ΔΓ_s$ reach an 18\% larger precision than the precision expected to be obtained from LHCb at HL-LHC. The control of penguin contamination at the future Z-factories is also discussed.
