Division of High Energy Physics, Department of Physics, University of Helsinki, FIN-00014 Helsinki, Finland and Helsinki Institute of Physics, FIN-00014 Helsinki, Finland.
Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy and University of Padova, I-35131 Padova, Italy.
Phys Rev Lett. 2014 Jun 13;112(23):231804. doi: 10.1103/PhysRevLett.112.231804. Epub 2014 Jun 9.
We report evidence for s-channel single-top-quark production in proton-antiproton collisions at center-of-mass energy sqrt[s] = 1.96 TeV using a data set that corresponds to an integrated luminosity of 9.4 fb(-1) collected by the Collider Detector at Fermilab. We select events consistent with the s-channel process including two jets and one leptonically decaying W boson. The observed significance is 3.8 standard deviations with respect to the background-only prediction. Assuming a top-quark mass of 172.5 GeV/c(2), we measure the s-channel cross section to be 1.41(-0.42)(+0.44) pb.
我们报告了在质心能量 sqrt[s] = 1.96 TeV 的质子-反质子碰撞中 s 道单顶夸克产生的证据，使用的数据集对应于费米实验室的 Collider Detector 收集的积分亮度为 9.4 fb(-1)。我们选择了与包括两个喷注和一个电弱衰变 W 玻色子的 s 道过程一致的事件。观察到的显著性为相对于仅背景预测的 3.8 个标准差。假设顶夸克质量为 172.5 GeV/c(2)，我们测量 s 道截面为 1.41(-0.42)(+0.44) pb。
