Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2010 May 21;104(20):201801. doi: 10.1103/PhysRevLett.104.201801. Epub 2010 May 17.
This Letter describes the current most precise measurement of the W boson pair production cross section and most sensitive test of anomalous WWγ and WWZ couplings in pp collisions at a center-of-mass energy of 1.96 TeV. The WW candidates are reconstructed from decays containing two charged leptons and two neutrinos. Using data collected by the CDF II detector from 3.6 fb(-1) of integrated luminosity, a total of 654 candidate events are observed with an expected background of 320±47 events. The measured cross section is σ(pp→W+ W- +X)=12.1±0.9(stat)-1.4+1.6(syst) pb, which is in good agreement with the standard model prediction. The same data sample is used to place constraints on anomalous WWγ and WWZ couplings.
这封信件描述了当前在质心能量为 1.96 TeV 的 pp 碰撞中，对 W 玻色子对产生截面的最精确测量和对反常 WWγ 和 WWZ 耦合的最敏感测试。WW 候选者是由包含两个带电轻子和两个中微子的衰变重建的。利用 CDF II 探测器在 3.6 fb-1 的积分亮度下收集的数据，总共观察到 654 个候选事件，预计背景为 320±47 个事件。测量的截面为 σ(pp→W+ W- +X)=12.1±0.9(stat)-1.4+1.6(syst) pb，与标准模型预测相符。相同的数据样本被用于对反常 WWγ 和 WWZ 耦合施加约束。
