利用 ATLAS 探测器在 sqrt(s) = 7 TeV pp 碰撞中测量 W+ W- 截面。
Measurement of the W+ W- cross section in sqrt(s) = 7 TeV pp collisions with ATLAS.
机构信息
Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg i.Br., Germany.
出版信息
Phys Rev Lett. 2011 Jul 22;107(4):041802. doi: 10.1103/PhysRevLett.107.041802. Epub 2011 Jul 20.
This Letter presents a measurement of the W+ W- production cross section in sqrt(s) = 7 TeV pp collisions by the ATLAS experiment, using 34 pb(-1) of integrated luminosity produced by the Large Hadron Collider at CERN. Selecting events with two isolated leptons, each either an electron or a muon, 8 candidate events are observed with an expected background of 1.7 ± 0.6 events. The measured cross section is 41(-16)(+20)(stat) ± 5(syst)±1(lumi) pb, which is consistent with the standard model prediction of 44 ± 3 pb calculated at next-to-leading order in QCD.
这封信件展示了 ATLAS 实验在 sqrt(s) = 7 TeV pp 碰撞中测量 W+ W- 产生截面的结果，使用了 CERN 的大型强子对撞机产生的 34 pb(-1)积分亮度。通过选择具有两个孤立轻子的事件，每个轻子要么是电子要么是缪子，观测到 8 个候选事件，对应的预期本底为 1.7 ± 0.6 个事件。测量得到的截面为 41(-16)(+20)(stat) ± 5(syst)±1(lumi) pb，与在 QCD 次领头阶计算得到的标准模型预测值 44 ± 3 pb 相符。
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