用ATLAS探测器测量在$\sqrt{s_{NN}}$ 2.76 TeV的铅-铅碰撞中Z玻色子的产生
Measurement of Z boson Production in Lead-Lead Collisions at $\sqrt{s_{NN}}$ 2.76 TeV with the ATLAS Detector
摘要：
ATLAS实验已经观测到了1995个$Z$玻色子候选者，其积分亮度光度为2011年LHC Pb+Pb运行中获得的0.15 nb $^{-1}$，能量为$\sqrt{s_{NN}}$ 2.76 TeV。$Z$玻色子通过双电子和双μ子衰变通道重建。两个通道的结果相互一致，并合并。背景小于所选样品的3%。在统计和系统的不确定性，每事件的$Z$玻色子产量集成在快度$|y^{Z}|<2.5$是成比例的二进制碰撞的数量估计的Glauber模型。$Z$玻色子的方位角分布相对于事件平面的椭圆流系数与零一致。
英文摘要：
The ATLAS experiment has observed 1995 $Z$ boson candidates in 0.15 nb$^{-1}$ of integrated luminosity obtained in the 2011 LHC Pb+Pb run at $\sqrt{s_{NN}}$ 2.76 TeV. The $Z$ bosons are reconstructed via di-electron and di-muon decay channels. The results from both channels are consistent with each other and are combined. The background is less than 3% of the selected sample. Within the statistical and systematic uncertainties, the per-event $Z$ boson yield integrated over rapidity $|y^{Z}|<2.5$ is proportional to the number of binary collisions estimated by the Glauber model. The elliptic flow coefficient of the azimuthal distribution of the $Z$ boson with respect to the event plane is consistent with zero.
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