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arXiv 1406.6776hep-ph
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在CERN LHC上精确测定Z-Z的混合

Precise determination of Z-Z' mixing at the CERN LHC

V. V. Andreev, P. Osland, A. A. Pankov

摘要:

讨论了在大型强子对撞机(LHC)上产生W^ \pm玻色子对过程中对Z'玻色子效应的预期敏感性。Z'玻色子效应的模型相关分析的结果被呈现为对Z-Z'混合角φ和Z'玻色子质量的约束。过程pp \to W^+W^- + X允许对Z-Z'混合角施加严格的约束。具体地说,我们发现,目前的LHC上的混合角的限制是几倍10^{-3}的顺序,这是相同的顺序从电弱数据。这些结果来自于对sqrt{s}=8 TeV和积分亮度为20 fb^{-1}时W对产生的分析。对这种混合的约束的进一步改进可以通过分析在LHC收集的具有标称能量和光度14 TeV和100 fb^{-1}的WW \to 1 nu 1 'nu'(1,l '= e或mu)和WW \to 1 nu jj最终状态的数据来实现,并且应该是phi \sim 10^{-4}-10 ^{-3}。

英文摘要:

We discuss the expected sensitivity to Z' boson effects in the W^\pm boson pair production process at the Large Hadron Collider (LHC). The results of a model-dependent analysis of Z' boson effects are presented as constraints on the Z-Z' mixing angle phi and Z' boson mass. The process pp\to W^+W^- + X allows to place stringent constraints on the Z-Z' mixing angle. Specifically, we find that the present LHC bounds on the mixing angle are of the order a few times 10^{-3}, what is of the same order as those derived from the electroweak data. These results were derived from analysis of W-pair production at sqrt{s}=8 TeV and integrated luminosity of 20 fb^{-1}. Further improvement on the constraining of this mixing can be achieved from the analysis of data on WW \to l nu l'nu' (l,l'=e or mu) and WW \to l nu jj final states collected at the LHC with nominal energy and luminosity, 14 TeV and 100 fb^{-1}, and should be phi \sim 10^{-4}-10^{-3}.

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