论文标题
$ cp $ - 义务阶段的测量
Measurement of the $CP$-violating phase $ϕ_s$ in $B^0_s \to J/ψϕ$ decays in ATLAS at 13 TeV
论文作者
论文摘要
提出了使用80.5 $ \ mathrm {fb}^{ - 1} $的$ b^0_s \ to j/ψϕ $衰减参数的测量。测得的参数包括$ cp $ - 义务阶段$ ϕ_s $，宽度差$Δγ_{s} $之间的$ b^0_s $梅森质量特征和平均衰减宽度$γ_{s} $。将物理参数测量的值与19.2 $ \ mathrm {fb}^{ - 1} $的7 TEV和8 TEV数据的值结合在一起：\ begin {eqnarray*} ϕ_s＆=＆=＆=＆=＆-0.087 \ -0.087 \ phantom {0} \ phantom {0} \ pm pm pm 0.036 \ phantom {0 〜\ \ m mathrm {（stat。）}} \ pm 0.021 \ phantom {0}〜\ mathrm {（syst。 〜\ Mathrm {（Syst。） \ end {eqnarray*} $ ϕ_s $和$δγ_{s} $的结果也显示为$ ϕ_s $ - $Δγ_{s} $平面的68％置信度等高线。此外，测量了横向振幅和相应的强相。 $ ϕ_s $和$δγ_{S} $测量与标准模型预测一致。
A measurement of the $B^0_s \to J/ψϕ$ decay parameters using 80.5 $\mathrm{fb}^{-1}$ of integrated luminosity collected with the ATLAS detector from 13 TeV proton-proton collisions at the LHC is presented. The measured parameters include the $CP$-violating phase $ϕ_s$, the width difference $ΔΓ_{s}$ between the $B^0_s$ meson mass eigenstates and the average decay width $Γ_{s}$. The values measured for the physical parameters are combined with those from 19.2 $\mathrm{fb}^{-1}$ of 7 TeV and 8 TeV data, leading to the following: \begin{eqnarray*} ϕ_s & = & -0.087\phantom{0} \pm 0.036\phantom{0} ~\mathrm{(stat.)} \pm 0.021\phantom{0} ~\mathrm{(syst.)~rad} \\ ΔΓ_{s} & = & \phantom{-}0.0657 \pm 0.0043 ~\mathrm{(stat.)} \pm 0.0037 ~\mathrm{(syst.)~ps}^{-1} \\ Γ_{s} & = & \phantom{-}0.6703 \pm 0.0014 ~\mathrm{(stat.)} \pm 0.0018 ~\mathrm{(syst.)~ps}^{-1} \\ \end{eqnarray*} Results for $ϕ_s$ and $ΔΓ_{s}$ are also presented as 68% confidence level contours in the $ϕ_s$-$ΔΓ_{s}$ plane. Furthermore, the transversity amplitudes and corresponding strong phases are measured. $ϕ_s$ and $ΔΓ_{s}$ measurements are in agreement with the Standard Model predictions.
