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arXiv 2001.07115hep-ex
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在13 TeV下测量ATLAS中$B^0_s \to J/ψϕ$衰变中的$CP$ -破坏相PDMATHAAB

Measurement of the $CP$-violating phase $ϕ_s$ in $B^0_s \to J/ψϕ$ decays in ATLAS at 13 TeV

ATLAS Collaboration

备注：
51 pages in total, author list starting page 35, 12 figures, 11 tables. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2018-01/
发表信息：
Eur. Phys. J. C 81 (2021) 342
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摘要：

利用ATLAS探测器收集的13 TeV质子-质子碰撞的80.5 $\mathrm{fb}^{-1}$积分光度测量了LHC的$B^0_s \to J/ψϕ$衰变参数。测量的参数包括$CP$破坏相$ϕ_s$、$B^0_s$介子质量本征态之间的宽度差$ΔΓ_{s}$和平均衰变宽度$Γ_{s}$ .将物理参数的测量值与7 TeV和8 TeV数据的19.2 $\mathrm{fb}^{-1}$的测量值相结合，得到以下结果：$ϕ_s$和$ΔΓ_{s}$的\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*}结果也显示为$ϕ_s$ - $ΔΓ_{s}$平面中的68%置信水平等值线。此外，测量了横向振幅和相应的强相位。$ϕ_s$和$ΔΓ_{s}$的测量结果与标准模型的预测一致。

英文摘要：

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.

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