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arXiv 1606.04017hep-ex
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用ATLAS探测器测量$\sqrt{s}=13$ TeV的$W^{\pm}Z$玻色子对产生截面

Measurement of the $W^{\pm}Z$ boson pair-production cross section in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector

ATLAS Collaboration

备注：
21 pages plus author list + cover pages (39 pages total), 4 figures, 4 tables, published in Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2015-19
发表信息：
Phys. Lett. B 762 (2016) 1
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摘要：

用ATLAS探测器在LHC上测量了质心能量为13 TeV的质子-质子碰撞中$W^{\pm}Z$事件的产生。所收集的数据对应于3.2 fb $^{-1}$的积分光度。$W^{\pm}Z$的候选者重建使用轻子衰变的规范玻色子到电子或μ子。在探测器基准区测得的轻子衰变模的包容性截面为$σ_{W^\pm Z \rightarrow \ell^{'} ν\ell \ell}^{\textrm{fid.}} = 63.2 \pm 3.2$（stat.）$\pm 2.6$（系统）$\pm 1.5$（光）FB.相比之下，次领先阶标准模型预测是$53.4^{+3.6}_{-2.8}$ fb。从基准到总相空间的测量的外推产生$σ_{W^{\pm}Z}^{\textrm{tot.}} = 50.6 \pm 2.6$（stat.）PDMATHAMT（系统）$\pm 0.9$（th.）$\pm 1.2$（光）pb，与最近$48.2^{+1.1}_{-1.0}$ pb的次-次-前导阶计算一致。的截面作为一个功能的射流多重性也被测量，连同电荷依赖的$W^+Z$和$W^-Z$截面和它们的比率。

英文摘要：

The production of $W^{\pm}Z$ events in proton--proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fb$^{-1}$. The $W^{\pm}Z$ candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons. The measured inclusive cross section in the detector fiducial region for leptonic decay modes is $σ_{W^\pm Z \rightarrow \ell^{'} ν\ell \ell}^{\textrm{fid.}} = 63.2 \pm 3.2$ (stat.) $\pm 2.6$ (sys.) $\pm 1.5$ (lumi.) fb. In comparison, the next-to-leading-order Standard Model prediction is $53.4^{+3.6}_{-2.8}$ fb. The extrapolation of the measurement from the fiducial to the total phase space yields $σ_{W^{\pm}Z}^{\textrm{tot.}} = 50.6 \pm 2.6$ (stat.) $\pm 2.0$ (sys.) $\pm 0.9$ (th.) $\pm 1.2$ (lumi.) pb, in agreement with a recent next-to-next-to-leading-order calculation of $48.2^{+1.1}_{-1.0}$ pb. The cross section as a function of jet multiplicity is also measured, together with the charge-dependent $W^+Z$ and $W^-Z$ cross sections and their ratio.

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