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arXiv 1901.03428hep-ex
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在$\sqrt{s} =$ 13 TeV测量pp $\to$ WZ包含和微分产生截面和对带电反常三规范耦合的约束

Measurements of the pp $\to$ WZ inclusive and differential production cross section and constraints on charged anomalous triple gauge couplings at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

WZ生产截面测量质子-质子碰撞在一个中心的质量能量$\sqrt{s} =$ 13 TeV使用收集的数据与CMS检测器,对应于35.9 FB $\sqrt{s} =$的集成光度。测量包含性截面为$σ_{\text{tot}}$(pp $\to$ WZ $)$ = 48.09 $^{+1.00}_{-0.96}$(stat)$^{+0.44}_{-0.37}$(theo)$^{+2.39}_{-2.17}$(syst)$\pm$ 1.39(lumi)pb,导致总不确定度为$-$ 2.78/ $+$ 2.98 pb。提供了基准截面和电荷依赖性截面测量的比率。微分截面测量也相对于三个变量:Z玻色子的横向动量$p_\mathrm{T}$,领先的喷流$p_\mathrm{T}$,和$m$(WZ)变量,定义为系统的不变质量组成的三个轻子和失踪的横向动量。差分测量相对于W玻色子$p_\mathrm{T}$,分开的电荷,也显示。结果与标准模型的预测是一致的,有利于下一个到下一个到领先的顺序预测在下一个到领先的顺序。约束异常的三重规范耦合来自通过分箱的最大似然拟合$m$(WZ)变量。

英文摘要:

The WZ production cross section is measured in proton-proton collisions at a centre-of-mass energy $\sqrt{s} =$ 13 TeV using data collected with the CMS detector, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The inclusive cross section is measured to be $σ_{\text{tot}}$(pp $\to$ WZ$)$ = 48.09 $^{+1.00}_{-0.96}$ (stat) $^{+0.44}_{-0.37}$ (theo) $^{+2.39}_{-2.17}$ (syst) $\pm$ 1.39 (lumi) pb, resulting in a total uncertainty of $-$2.78/$+$2.98 pb. Fiducial cross section and ratios of charge-dependent cross section measurements are provided. Differential cross section measurements are also presented with respect to three variables: the Z boson transverse momentum $p_\mathrm{T}$, the leading jet $p_\mathrm{T}$, and the $m$(WZ) variable, defined as the invariant mass of the system composed of the three leptons and the missing transverse momentum. Differential measurements with respect to the W boson $p_\mathrm{T}$, separated by charge, are also shown. Results are consistent with standard model predictions, favouring next-to-next-to-leading-order predictions over those at next-to-leading order. Constraints on anomalous triple gauge couplings are derived via a binned maximum likelihood fit to the $m$(WZ) variable.

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