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arXiv 1105.1806hep-ex
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在sqrt(s)=1.96 TeV的ppbar碰撞中用大的缺失横向能量和喷流事件测量ttbar产生截面

Measurement of the ttbar production cross section in ppbar collisions at sqrt(s)=1.96 TeV using events with large missing transverse energy and jets

CDF Collaboration, T. Aaltonen

摘要:

在本文中,我们报告的测量ttbar的产生截面在ppbar碰撞在sqrt(s)=1.96 TeV使用相应的数据,积分亮度为2.2 fb-1的CDF II探测器在Tevatron加速器收集。我们选择的事件具有显着的缺失横向能量和高喷流多重性。这种测量否决了明确识别的电子和μ子的存在,从而增强了ttbar衰变的τ贡献。使用神经网络从背景中区分信号事件,并通过二次顶点标记算法识别重味射流。我们测得的ttbar产生截面为7.99 +/- 0.55(stat)+/- 0.76(syst)+/- 0.46(lumi)pb,假设顶部质量m_top = 172.5 GeV/c^2,与以前的测量和标准模型预测一致。

英文摘要:

In this paper we report a measurement of the ttbar production cross section in ppbar collisions at sqrt(s)=1.96 TeV using data corresponding to an integrated luminosity of 2.2fb-1 collected with the CDF II detector at the Tevatron accelerator. We select events with significant missing transverse energy and high jet multiplicity. This measurement vetoes the presence of explicitly identified electrons and muons, thus enhancing the tau contribution of ttbar decays. Signal events are discriminated from the background using a neural network, and heavy flavor jets are identified by a secondary-vertex tagging algorithm. We measure a ttbar production cross section of 7.99 +/- 0.55(stat) +/- 0.76(syst) +/- 0.46(lumi) pb, assuming a top mass m_top = 172.5 GeV/c^2, in agreement with previous measurements and standard model predictions.

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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