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arXiv 1003.0224hep-ex
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TeV = 1.96的ppbar碰撞顶夸克衰变中W玻色子极化的测量

Measurement of W-Boson Polarization in Top-quark Decay in ppbar Collisions at sqrt(s) = 1.96 TeV

The CDF Collaboration, T. Aaltonen

摘要:

我们报告了利用CDF II探测器收集到的2.7 fb^-1的ppbar碰撞对顶夸克衰变产生的W玻色子的偏振进行的测量。假设顶夸克的质量为175 GeV/c^2,我们进行了三次测量。同时测量纵向W玻色子(f_0)和右手W玻色子(f_+)的分数,得到与模型无关的结果:f_0 = 0.88 \pm 0.11(stat)\pm 0.06(syst)和f_+ = -0.15 \pm 0.07(stat)\pm 0.06(syst),相关系数为-0.59。将f_+(f_0)约束到其标准模型值0.0(0.7)的f_0(f_+)测量结果为f_0 = 0.70 \pm 0.07(stat)\pm 0.04(syst)(f_+ = -0.01 \pm 0.02(stat)\pm 0.05(syst))。所有这些结果与标准模型的预期一致。

英文摘要:

We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb^-1 of ppbar collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c^2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f_0) and right-handed (f_+) W bosons yields the model-independent results f_0 = 0.88 \pm 0.11 (stat) \pm 0.06 (syst) and f_+ = -0.15 \pm 0.07 (stat) \pm 0.06 (syst) with a correlation coefficient of -0.59. A measurement of f_0 (f_+) constraining f_+ (f_0) to its standard model value of 0.0 (0.7) yields f_0 = 0.70 \pm 0.07 (stat) \pm 0.04 (syst) (f_+ = -0.01 \pm 0.02 (stat) \pm 0.05 (syst)). All these results are consistent with standard model expectations.

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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