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Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2008 Oct 24;101(17):171803. doi: 10.1103/PhysRevLett.101.171803. Epub 2008 Oct 23.
We present an observation for ZZ-->l+l-l'+l'- (l, l'=e or mu) production in p[over]p collisions at a center-of-mass energy of sqrt[s]=1.96 TeV. Using 1.7 fb(-1) of data collected by the D0 experiment at the Fermilab Tevatron Collider, we observe three candidate events with an expected background of 0.14(+0.03)(-0.02) events. The significance of this observation is 5.3 standard deviations. The combination of D0 results in this channel, as well as in ZZ-->l+l- nu[over]nu, yields a significance of 5.7 standard deviations and a combined cross section of sigma(ZZ)=1.60+/-0.63(stat)+0.16-0.17(syst) pb.
我们展示了在费米实验室万亿电子伏特加速器质心能量(\sqrt{s}=1.96)太电子伏特的(p\bar{p})碰撞中(ZZ \to l^+l^-l'^+l'^-)（(l, l' = e)或(\mu)）产生过程的一项观测结果。利用费米实验室万亿电子伏特加速器上D0实验收集的(1.7)飞靶(^{-1})数据，我们观测到三个候选事例，预期本底为(0.14(^{ + 0.03}{ - 0.02}))个事例。这一观测的显著性为(5.3)个标准差。该道次以及(ZZ \to l^+l^-\nu\bar{\nu})道次的D0结果相结合，显著性为(5.7)个标准差，组合截面为(\sigma(ZZ)=1.60\pm0.63)（统计）( + 0.16{ - 0.17})（系统）皮靶。
