Division of High Energy Physics, Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland; Helsinki Institute of Physics, FIN-00014 Helsinki, Finland.
Joint Institute for Nuclear Research, RU-141980 Dubna, Russia.
Phys Rev Lett. 2014 Jun 13;112(23):231803. doi: 10.1103/PhysRevLett.112.231803. Epub 2014 Jun 9.
We report the first observation of single-top-quark production in the s channel through the combination of the CDF and D0 measurements of the cross section in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. The data correspond to total integrated luminosities of up to 9.7 fb(-1) per experiment. The measured cross section is σ(s) = 1.29(-0.24)(+0.26) pb. The probability of observing a statistical fluctuation of the background to a cross section of the observed size or larger is 1.8 × 10(-10), corresponding to a significance of 6.3 standard deviations for the presence of an s-channel contribution to the production of single-top quarks.
我们报告了在质心能量为 1.96 TeV 的质子-反质子碰撞中，通过 CDF 和 D0 实验对 s 道中单顶夸克产生截面的联合测量，首次观测到单顶夸克产生的现象。数据对应于每个实验的总积分亮度高达 9.7 fb(-1)。测量得到的截面为 σ(s) = 1.29(-0.24)(+0.26) pb。观测到的截面大小或更大的背景统计涨落的概率为 1.8×10(-10)，这对应于 s 道中单顶夸克产生贡献存在的 6.3 个标准偏差的显著性。
