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arXiv 1006.0761hep-ex
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$\sqrt{s}$ = 1.96 TeV时$p\bar{p}$碰撞中$WZ\rightarrow \ellν\ell\ell$截面的测量和反常三规范耦合的极限

Measurement of the $WZ\rightarrow \ellν\ell\ell$ cross section and limits on anomalous triple gauge couplings in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV

D0 Collaboration, V. Abazov et al

摘要:

提出了一种新的$WZ\rightarrow \ellν\ell\ell$($\ell = e,μ$)截面的测量方法和反常三规范耦合的极限。利用$\sqrt{s} = 1.96$ TeV的$p\bar{p}$碰撞积分光度的4.1 fb $^{-1}$,我们观测到了34个$WZ$候选事件,估计了$6.0 \pm 0.4$事件的背景。我们测量的$WZ$生产的截面为$3.90^{+1.06}_{-0.90}$ pb,与标准模型预测的很好的协议。我们没有发现异常$WWZ$耦合的证据,并设置95% C. L。在$Λ= 2$ TeV形状因子标度的HISZ参数化中,对耦合参数$-0.075 < λ_{Z} < 0.093$和$-0.027 < Δκ_{Z} < 0.080$的限制。这些是迄今为止从$WWZ$顶点的直接测量获得的最佳极限。

英文摘要:

We present a new measurement of the $WZ\rightarrow \ellν\ell\ell$ ($\ell = e,μ$) cross section and limits on anomalous triple gauge couplings. Using 4.1 fb$^{-1}$ of integrated luminosity of $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV, we observe 34 $WZ$ candidate events with an estimated background of $6.0 \pm 0.4$ events. We measure the $WZ$ production cross section to be $3.90^{+1.06}_{-0.90}$ pb, in good agreement with the standard model prediction. We find no evidence for anomalous $WWZ$ couplings and set 95% C.L. limits on the coupling parameters, $-0.075 < λ_{Z} < 0.093$ and $-0.027 < Δκ_{Z} < 0.080$, in the HISZ parameterization for a $Λ= 2$ TeV form factor scale. These are the best limits to date obtained from the direct measurement of the $WWZ$ vertex.

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