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arXiv 0912.4500hep-ex
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在$\sqrt{s} = 1.96$ TeV的PDMATHAAD碰撞中测量$W^+W^-$产生截面和寻找反常的PDMATHAAB和$WWZ$耦合

Measurement of the $W^+W^-$ Production Cross Section and Search for Anomalous $WWγ$ and $WWZ$ Couplings in $p \bar p$ Collisions at $\sqrt{s} = 1.96$ TeV

The CDF Collaboration, T. Aaltonen

摘要:

这封信描述了目前最精确的测量$W$玻色子对生产截面和最灵敏的测试异常$WWγ$和$WWZ$耦合在$p \bar p$碰撞在质心能量为1.96 TeV。$WW$候选者是从包含两个带电轻子和两个中微子的衰变中重建的,其中带电轻子是电子或μ子。使用CDF II探测器从3.6 fb $^{-1}$积分光度收集的数据,总共观察到654个候选事件,预期背景贡献为$320 \pm 47$事件。测得的总截面为$σ(p \bar p \to W^+ W^- + X) = 12.1 \pm 0.9 \textrm{(stat)} ^{+1.6}_{-1.4} \textrm{(syst)}$ pb,与标准模型预测值吻合较好。使用相同的数据样本对异常$WWγ$和$WWZ$耦合进行约束。

英文摘要:

This Letter describes the current most precise measurement of the $W$ boson pair production cross section and most sensitive test of anomalous $WWγ$ and $WWZ$ couplings in $p \bar p$ collisions at a center-of-mass energy of 1.96 TeV. The $WW$ candidates are reconstructed from decays containing two charged leptons and two neutrinos, where the charged leptons are either electrons or muons. Using data collected by the CDF II detector from 3.6 fb$^{-1}$ of integrated luminosity, a total of 654 candidate events are observed with an expected background contribution of $320 \pm 47$ events. The measured total cross section is $σ(p \bar p \to W^+ W^- + X) = 12.1 \pm 0.9 \textrm{(stat)} ^{+1.6}_{-1.4} \textrm{(syst)}$ pb, which is in good agreement with the standard model prediction. The same data sample is used to place constraints on anomalous $WWγ$ and $WWZ$ couplings.

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