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arXiv 1201.4803hep-ex
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在Tevatron上测量自旋向上排列的新方法

New Measurements of Upsilon Spin Alignment at the Tevatron

Matthew Jones

摘要:

我们描述了一个新的分析的Uppersons(nS)的μ + μ-衰变收集在质子反质子碰撞与CDF II探测器在费米实验室Tevatron。该分析测量了末态μ子在Uppermont静止框架中的角分布,提供了关于Uppermont产生极化的新信息。我们发现的角分布是近各向同性高达40 GeV/c的Uppermandate横向动量,与以前的测量CDF一致,但不一致的D 0实验所获得的结果。将结果与最近基于色单重态矩阵元和具有色八重态矩阵元的非相对论QCD的NLO计算进行了比较。

英文摘要:

We describe a new analysis of Upsilon(nS) to mu+mu- decays collected in proton anti-proton collisions with the CDF II detector at the Fermilab Tevatron. This analysis measures the angular distributions of the final state muons in the Upsilon rest frame, providing new information about Upsilon production polarization. We find the angular distributions to be nearly isotropic up to Upsilon transverse momentum of 40 GeV/c, consistent with previous measurements by CDF, but inconsistent with results obtained by the D0 experiment. The results are compared with recent NLO calculations based on color-singlet matrix elements and non-relativistic QCD with color-octet matrix elements.

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