标题： 微分分支比和衰变的角分布分析 $B_s^0\toφμ^{+}μ^{-}$ 显示英文标题

标题： Differential branching fraction and angular analysis of the decay $B_s^0\toφμ^{+}μ^{-}$

摘要： 对衰变$B_s^0\to\phi\mu^{+}\mu^{-}$的微分分支比和首次角分析的呈现是使用数据，对应于 LHCb 实验在$\sqrt{s}=7\,{\rm TeV}$处收集的积分亮度$1.0\,{\rm fb}^{-1}$。 微分分支比是在$q^{2}$的区间内确定的，即不变双μ子质量平方。 对整个$q^{2}$范围进行积分得到总分支比为${\cal B}(B_s^0\to\phi\mu^{+}\mu^{-}) = (7.07\,^{+0.64}_{-0.59}\pm 0.17 \pm 0.71)\times 10^{-7}$，其中第一个不确定性为统计学上的，第二个为系统性的，第三个来源于归一化通道的分支比。 对角度观测量$F_{\rm L}$、$S_3$、$A_6$和$A_9$进行角度分析。 这些观测量与标准模型预期一致。 显示英文摘要

摘要： The determination of the differential branching fraction and the first angular analysis of the decay $B_s^0\to\phi\mu^{+}\mu^{-}$ are presented using data, corresponding to an integrated luminosity of $1.0\,{\rm fb}^{-1}$, collected by the LHCb experiment at $\sqrt{s}=7\,{\rm TeV}$. The differential branching fraction is determined in bins of $q^{2}$, the invariant dimuon mass squared. Integration over the full $q^{2}$ range yields a total branching fraction of ${\cal B}(B_s^0\to\phi\mu^{+}\mu^{-}) = (7.07\,^{+0.64}_{-0.59}\pm 0.17 \pm 0.71)\times 10^{-7}$, where the first uncertainty is statistical, the second systematic, and the third originates from the branching fraction of the normalisation channel. An angular analysis is performed to determine the angular observables $F_{\rm L}$, $S_3$, $A_6$, and $A_9$. The observables are consistent with Standard Model expectations.