Measurement of the W ? l? and Z/? * ? ll production cross sections in proton-proton collisions at $ \sqrt {s} = 7\;{\text{TeV}} $ with the ATLAS detector
Measurement of the W ? l? and Z/? * ? ll production cross sections in proton-proton collisions at $ \sqrt {s} = 7\;{\text{TeV}} $ with the ATLAS detector
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W 的测量？
DOI：
10.1007/jhep12(2010)060
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发表时间：
2010
影响因子：
5.4
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
本文利用大型强子对撞机上的ATLAS实验记录的数据，首次测量了质子-质子碰撞中的W→ℓν和Z/γ*→ℓℓ(ℓ=e，μ)产生截面。结果基于2250W→ℓν和179Z/γ*→ℓℓ候选事件，这些候选事件选自与大约320nb的积分光度相对应的数据集。测得的总W和Z/γ∗玻色子产生截面乘以电子和介子组合通道各自的轻子分支率。BR(W→ℓν)=9.96±0.23(状态)±0.50(系统)±1.10(流明)Nb和BR(Z/γ∗→ℓℓ)=0。82±0。06(统计)±0。05(系统)±0。09(LUMI)Nb(在不变质量窗口66ℓℓ；116GeV内)。测得W/Z截面比为11.7±0.9(STAT)±0.4(SYST)。此外，还报道了W+和W−产生截面以及轻子电荷不对称性的测量结果。基于NNLO QCD计算的理论预测与测量结果一致。
First measurements of the W→ ℓν and Z/γ*→ ℓℓ (ℓ= e, μ) production cross sections in proton-proton collisions atare presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W→ ℓν and 179 Z/γ*→ ℓℓ candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb. The measured total W and Z/γ∗-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are. BR (W→ ℓν)= 9.96±0.23 (stat)±0.50 (syst)±1.10 (lumi) nb andBR (Z/γ∗→ ℓℓ)= 0. 82±0. 06 (stat)±0. 05 (syst)±0. 09 (lumi) nb (within the invariant mass window 66< m ℓℓ< 116GeV). The W/Z cross-section ratio is measured to be 11.7±0.9 (stat)±0.4 (syst). In addition, measurements of the W+ and W− production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.