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arXiv 1104.3078hep-ex
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sqrt(s)=1.96 TeV时p-pbar碰撞中ZZ产生截面的测量

Measurement of the ZZ production cross section in p-pbar collisions at sqrt(s)=1.96 TeV

D0 Collaboration, V. Abazov

摘要:

本文提出了一种新的测量方法,测量了四个带电轻子末态$\ell^{+}\ell^{-}\ell^{'+} \ell^{'-}$($\ell$,$\ell^{'}$ = $e$或$μ$)在质心能量为$\sqrt{s}=1.96$ TeV时的产生截面.我们观察到十个候选事件与预期的背景$0.37 \pm 0.13$事件。测量的截面$σ(p\bar{p} \to ZZ)= 1.26^{+0.47}_{-0.37} \mathrm{(stat)} \pm 0.14 \mathrm{(syst)}$ pb与非线性光学QCD预言一致。将该结果与来自$ZZ\to\ell^{+}\ell^{-}ν\barν$通道的先前结果组合,得到$σ(p\bar{p} \to ZZ)= 1.40^{+0.43}_{-0.37} \mathrm{(stat)} \pm 0.14 \mathrm{(syst)}$ pb的组合截面。

英文摘要:

We present a new measurement of the production cross section $σ(p\bar{p} \rightarrow ZZ)$ at a center-of-mass energy $\sqrt{s}=1.96$ TeV, obtained from the analysis of the four charged lepton final state $\ell^{+}\ell^{-}\ell^{'+} \ell^{'-}$ ($\ell$, $\ell^{'}$ = $e$ or $μ$). We observe ten candidate events with an expected background of $0.37 \pm 0.13$ events. The measured cross section $σ(p\bar{p} \to ZZ)= 1.26^{+0.47}_{-0.37} \mathrm{(stat)} \pm 0.14 \mathrm{(syst)}$ pb is in agreement with NLO QCD predictions. This result is combined with a previous result from the $ZZ\to\ell^{+}\ell^{-}ν\barν$ channel resulting in a combined cross section of $σ(p\bar{p} \to ZZ)= 1.40^{+0.43}_{-0.37} \mathrm{(stat)} \pm 0.14 \mathrm{(syst)}$ pb.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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