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arXiv 1107.4789hep-ex
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sqrt(s)= 7 TeV pp碰撞中包含W和Z产生截面的测量

Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions at sqrt(s) = 7 TeV

The CMS Collaboration

摘要:

本文测量了sqrt(s)=7 TeV pp碰撞中包含W和Z的产生截面。电子和μ子衰变通道的分析数据样本收集与CMS检测器在大型强子对撞机和相应的积分亮度的36个反皮巴。测得的包容性截面为σ(pp-> WX)B(W-> 1 nu)= 10.30 +/- 0.02(stat.)+/- 0.10(系统)+/- 0.10(th.)+/- 0.41(流明)nb和sigma(pp -> ZX)B(Z-> 1 ^+1 ^-)= 0.974 +/- 0.007(统计)+/- 0.007(系统)+/- 0.018(th.)+/- 0.039(流明)nb,限于双轻子不变质量范围60至120 GeV。与亮度无关的截面比为[sigma(pp->WX)B(W-> 1 nu)]/[sigma(pp-> ZX)B(Z-> 1 ^+1 ^-)] = 10.54 +/- 0.07(stat.)+/- 0.08(系统)+/- 0.16(th.)[σ(pp->W^+X)B(W^+ -> l^+nu)] / [σ(pp->W^- X)B(W^- -> l^- nu)] = 1.421 +/- 0.006(stat.)+/- 0.014(系统)+/- 0.029(th.)。测量值与基于最近的部分子分布函数的次-次-首阶QCD截面计算结果一致。

英文摘要:

A measurement of inclusive W and Z production cross sections in pp collisions at sqrt(s)=7 TeV is presented. The electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. The measured inclusive cross sections are sigma(pp-> WX) B(W-> l nu) = 10.30 +/- 0.02 (stat.) +/- 0.10 (syst.) +/- 0.10 (th.) +/- 0.41 (lumi.) nb and sigma(pp -> ZX) B(Z-> l^+l^-) = 0.974 +/- 0.007 (stat.) +/- 0.007 (syst.) +/- 0.018 (th.) +/- 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are [sigma(pp->WX) B(W-> l nu)]/[sigma(pp-> ZX) B(Z->l^+l^-)] = 10.54 +/- 0.07 (stat.) +/- 0.08 (syst.) +/- 0.16 (th.) and [sigma(pp->W^+X) B(W^+ -> l^+nu)] / [sigma(pp->W^- X) B(W^- -> l^- nu)] = 1.421 +/- 0.006 (stat.) +/- 0.014 (syst.) +/- 0.029 (th.). The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions.

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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