在 sqrt[s] = 8 TeV 的 pp 碰撞中测量 inclusive W 和 Z 玻色子产生截面。
Measurement of inclusive W and Z boson production cross sections in pp collisions at sqrt[s] = 8 TeV.
机构信息
Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik der OeAW, Wien, Austria.
出版信息
Phys Rev Lett. 2014 May 16;112(19):191802. doi: 10.1103/PhysRevLett.112.191802. Epub 2014 May 14.
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 pb(-1). The measured total inclusive cross sections times branching fractions are σ(pp → WX)×B(W → ℓν) = 12.21 ± 0.03(stat) ± 0.24(syst) ± 0.32(lum) nb and σ(pp → ZX) × B(Z → ℓ+ℓ-) = 1.15 ± 0.01(stat) ± 0.02(syst) ± 0.03(lum) nb for the dilepton mass in the range of 60-120 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.
测量了在 sqrt[s] = 8 TeV 的 pp 碰撞中总 inclusive W 和 Z 玻色子产生截面。在 CMS 探测器采集的对应于 18.2 ± 0.5 pb(-1) 积分亮度的数据集里分析了电子和缪子末态。测量的总 inclusive 截面乘以分支比为 σ(pp → WX)×B(W → ℓν) = 12.21 ± 0.03(stat) ± 0.24(syst) ± 0.32(lum) nb 和 σ(pp → ZX) × B(Z → ℓ+ℓ-) = 1.15 ± 0.01(stat) ± 0.02(syst) ± 0.03(lum) nb，对于 dilepton 质量在 60-120 GeV 范围内。测量值与次领头阶 QCD 截面计算相符。截面比的精度为 2%。这是 sqrt[s] = 8 TeV 的质子-质子碰撞中首次测量 inclusive W 和 Z 玻色子产生。
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