论文标题
$ b_c^+\至j/ψd_s^+$和$ b_c^+\的研究
Study of $B_c^+\to J/ψD_s^+$ and $B_c^+\to J/ψD_s^{*+}$ decays in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
论文作者
论文摘要
$ b_c^+\ to j/ψd_s^+$和$ b_c^+\ to j/ψd_s^{*+} $使用139 fb $^{ - 1} $衰减的集成光度的损失，该集成的发光度与ATLAS检测器从$ \ sqrt {s} = 13 $ collixions Atlas detector收集的集成发光量。测量了$ b_c^+\与j/ψπ^+$衰减的分支分支与分支的比例：$ \ nathcal b（b_c^+\ to j/c^+\ to j/ar b（b_c^+\ to j/ψd_s^{*+}）/\ mathcal b（b_c^+\ to j/ψπ^+）= 5.33 \ pm 0.96 $。发现这两个衰减的分支分数的比率为$ \ MATHCAL B（B_C^+\与J/ψD_S^{*+}）/\ MATHCAL B（B_C^+\ to J/ψD_S^+）= 1.93 \ PM0.26 $。对于$ b_c^+\ to j/ψd_s^{*+} $衰减，横向极化分数，$γ_{\ pm \ pm}/γ$，测量为$ 0.70 \ pm0.11 $。报告的不确定性包括正交中添加的统计和系统组件。测量的精度超过了这些衰减的所有先前研究。这些结果取代了与$ \ sqrt {s} = 7 $和8 tev $ pp $ collision数据的同一衰变的早期Atlas研究中获得的结果。给出了与可用的测量量的可用理论预测的比较。
A study of $B_c^+\to J/ψD_s^+$ and $B_c^+\to J/ψD_s^{*+}$ decays using 139 fb$^{-1}$ of integrated luminosity collected with the ATLAS detector from $\sqrt{s} = 13$ TeV $pp$ collisions at the LHC is presented. The ratios of the branching fractions of the two decays to the branching fraction of the $B_c^+\to J/ψπ^+$ decay are measured: $\mathcal B(B_c^+\to J/ψD_s^+)/\mathcal B(B_c^+\to J/ψπ^+) = 2.76\pm 0.47$ and $\mathcal B(B_c^+\to J/ψD_s^{*+})/\mathcal B(B_c^+\to J/ψπ^+) = 5.33\pm 0.96$. The ratio of the branching fractions of the two decays is found to be $\mathcal B(B_c^+\to J/ψD_s^{*+})/\mathcal B(B_c^+\to J/ψD_s^+) = 1.93\pm0.26$. For the $B_c^+\to J/ψD_s^{*+}$ decay, the transverse polarization fraction, $Γ_{\pm\pm}/Γ$, is measured to be $0.70\pm0.11$. The reported uncertainties include both the statistical and systematic components added in quadrature. The precision of the measurements exceeds that in all previous studies of these decays. These results supersede those obtained in the earlier ATLAS study of the same decays with $\sqrt{s} = 7$ and 8 TeV $pp$ collision data. A comparison with available theoretical predictions for the measured quantities is presented.
