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arXiv 1402.0923hep-ex
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sqrt(s)= 8 TeV pp碰撞中包含W和Z玻色子产生截面的测量

Measurement of inclusive W and Z boson production cross sections in pp collisions at sqrt(s) = 8 TeV

CMS Collaboration

摘要:

给出了sqrt(s)= 8 TeV pp碰撞中W和Z玻色子产生截面的测量结果。电子和μ子的最终状态进行了分析,在数据样本收集与CMS检测器对应的积分亮度为18.2 +/- 0.5皮巴。测得的总包含截面乘以支化分数为σ(pp至W X)B(W至1 nu)= 12.21 +/- 0.03(stat.)+/- 0.24(系统)+/- 0.32(lum.)nb和sigma(pp至Z X)B(Z至l+ l-)= 1.15 +/- 0.01(统计)+/- 0.02(系统)+/- 0.03(lum.)nb的双轻子质量范围为60至120 GeV。测量值与次-次-首阶QCD截面计算结果一致。报告截面比,精度为2%。这是在sqrt(s)= 8 TeV的质子-质子碰撞中包含W和Z玻色子产生的第一次测量。

英文摘要:

A measurement of total and fiducial inclusive W and Z boson production cross sections in pp collisions at sqrt(s) = 8 TeV is presented. Electron and muon final states are analyzed in a data sample collected with the CMS detector corresponding to an integrated luminosity of 18.2 +/- 0.5 inverse picobarns. The measured total inclusive cross sections times branching fractions are sigma(pp to W X) B(W to l nu) = 12.21 +/- 0.03 (stat.) +/- 0.24 (syst.) +/- 0.32 (lum.) nb and sigma(pp to Z X) B(Z to l+ l-) = 1.15 +/- 0.01 (stat.) +/- 0.02 (syst.) +/- 0.03 (lum.) nb for the dilepton mass in the range of 60 to 120 GeV. The measured values agree with next-to-next-to-leading-order QCD cross section calculations. Ratios of cross sections are reported with a precision of 2%. This is the first measurement of inclusive W and Z boson production in proton-proton collisions at sqrt(s) = 8 TeV.

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