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arXiv 1607.05084hep-exhep-ph
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通过Tevatron和LHC截面测量确定W玻色子的μ子分支比及其总宽度

Determination of the muonic branching ratio of the W boson and its total width via cross-section measurements at the Tevatron and LHC

Stefano Camarda, Jakub Cuth, Matthias Schott

摘要:

总的$W$ -玻色子衰变宽度$Γ_W$是一个重要的观测值,它允许对标准模型进行检验.目前的世界平均值是基于对$W$玻色子衰变的最终状态运动学性质的直接测量,并且具有2%的相对不确定性。通过矢量玻色子产生的截面测量间接测定$Γ_W$可以得到类似的精度。同样的方法也导致轻子分支比的测定。这种方法已经成功地被Tevatron对撞机的CDF和D 0实验以及LHC的CMS合作所采用。在本文中,我们提出了第一次在强子对撞机的可用测量的组合,占相关的系统不确定性的相关性。我们的组合导致$\textrm{BR}(W\rightarrowμν)=(10.72 \pm 0.16)\%$和$Γ_W = 2113 \pm 31$ MeV的值,分别与当前的世界平均值兼容。

英文摘要:

The total $W$-boson decay width $Γ_W$ is an important observable which allows testing of the standard model. The current world average value is based on direct measurements of final state kinematic properties of $W$-boson decays, and has a relative uncertainty of 2%. The indirect determination of $Γ_W$ via the cross-section measurements of vector-boson production can lead to a similar accuracy. The same methodology leads also to a determination of the leptonic branching ratio. This approach has been successfully pursued by the CDF and D0 experiments at the Tevatron collider, as well as by the CMS collaboration at the LHC. In this paper we present for the first time a combination of the available measurements at hadron colliders, accounting for the correlations of the associated systematic uncertainties. Our combination leads to values of $\textrm{BR}(W\rightarrowμν)=(10.72 \pm 0.16)\%$ and $Γ_W = 2113 \pm 31$ MeV, respectively, both compatible with the current world averages.

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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