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arXiv 1202.4617hep-ex
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在sqrt(s)=7 TeV时pp碰撞中包含的b-jet产生

Inclusive b-jet production in pp collisions at sqrt(s)=7 TeV

CMS Collaboration

摘要:

利用LHC CMS实验收集的数据测量了质心能量为7 TeV的pp碰撞中b-喷流产生的包容性截面。在18 < pT < 200 GeV范围内,给出了几个快度区间的截面与喷流横向动量的函数关系。结果也以b-射流产生截面与包含射流产生截面的比率给出。测量是用两种不同的分析来进行的,这两种分析在触发选择和b-喷流识别方面不同:喷流分析使用对应于34个反向皮巴的积分亮度的样本来选择具有b-喷流的事件,以及μ子分析需要基于3个反向皮巴的积分亮度的具有μ子的b-喷流。在这两种方法中,b喷流都是通过要求一个次顶点来识别的。从这两种方法的结果是一致的,彼此和下一个领先的顺序计算,以及与预测的基础上的PYTHIA事件发生器。

英文摘要:

The inclusive b-jet production cross section in pp collisions at a center-of-mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet transverse momentum in the range 18 < pT < 200 GeV for several rapidity intervals. The results are also given as the ratio of the b-jet production cross section to the inclusive jet production cross section. The measurement is performed with two different analyses, which differ in their trigger selection and b-jet identification: a jet analysis that selects events with a b jet using a sample corresponding to an integrated luminosity of 34 inverse picobarns, and a muon analysis requiring a b jet with a muon based on an integrated luminosity of 3 inverse picobarns. In both approaches the b jets are identified by requiring a secondary vertex. The results from the two methods are in agreement with each other and with next-to-leading order calculations, as well as with predictions based on the PYTHIA event generator.

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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