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arXiv 0903.1748hep-ex
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sqrt{s}=1.96 TeV质子反质子碰撞中Z/γ *+喷流+X事例微分截面的测量

Measurements of differential cross sections of Z/gamma*+jets+X events in proton anti-proton collisions at sqrt{s}=1.96 TeV

D0 Collaboration, V. Abazov

摘要:

我们目前的截面测量Z/伽马 *+射流+X生产,三个领先的射流的横向动量差。数据样本是用费米实验室Tevatron质子反质子对撞机上的D 0探测器收集的,质心能量为1.96 TeV,对应的积分亮度为1 fb-1。领导和次领导阶微扰QCD预测与测量进行了比较,发现在理论和实验的不确定性和协议。我们还与四个事件发生器的预测进行了比较。两个基于部分子簇射的发电机显示出显着的形状和归一化的差异,相对于数据。相比之下,两个发电机相结合的树级矩阵元素与部分子簇给出了一个合理的描述的数据中观察到的形状,但预测的归一化显示显着差异的数据,反映了大规模的不确定性。对于尺度的特定选择,可以使任一发生器的归一化与测量一致。

英文摘要:

We present cross section measurements for Z/gamma*+jets+X production, differential in the transverse momenta of the three leading jets. The data sample was collected with the D0 detector at the Fermilab Tevatron proton anti-proton collider at a center-of-mass energy of 1.96 TeV and corresponds to an integrated luminosity of 1 fb-1. Leading and next-to-leading order perturbative QCD predictions are compared with the measurements, and agreement is found within the theoretical and experimental uncertainties. We also make comparisons with the predictions of four event generators. Two parton-shower-based generators show significant shape and normalization differences with respect to the data. In contrast, two generators combining tree-level matrix elements with a parton shower give a reasonable description of the the shapes observed in data, but the predicted normalizations show significant differences with respect to the data, reflecting large scale uncertainties. For specific choices of scales, the normalizations for either generator can be made to agree with the measurements.

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