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arXiv 0909.1505hep-ex
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TeV = 1.96时p-pbar碰撞中含W玻色子事件的b喷流截面的首次测量

First Measurement of the b-jet Cross Section in Events with a W Boson in p-pbar Collisions at sqrt{s} = 1.96 TeV

The CDF Collaboration, T. Aaltonen

摘要:

用Tevatron上的CDF II探测器记录的1.9/fb的积分亮度的ppbar碰撞数据测量了b夸克与W玻色子产生喷注的截面。W+ b-喷流过程在顶夸克产生的测量和对希格斯玻色子的突出搜索中构成了重要的背景。我们测量的b-射流截面为2.74 ± 0.27(统计)。+- 0.42(系统)pb与轻子W玻色子在有限运动学相空间上衰变的单一味相关联。这一测量结果无法在几个现有的理论预测。

英文摘要:

The cross section for jets from b quarks produced with a W boson has been measured in ppbar collision data from 1.9/fb of integrated luminosity recorded by the CDF II detector at the Tevatron. The W+b-jets process poses a significant background in measurements of top quark production and prominent searches for the Higgs boson. We measure a b-jet cross section of 2.74 +- 0.27(stat.) +- 0.42(syst.) pb in association with a single flavor of leptonic W boson decay over a limited kinematic phase space. This measured result cannot be accommodated in several available theoretical predictions.

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