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arXiv 1202.0704hep-ex
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在sqrt(s)= 7 TeV时pp碰撞中前向喷流和具有一个前向喷流和一个中心喷流的双喷流事件的包含性产生截面的测量

Measurement of the inclusive production cross sections for forward jets and for dijet events with one forward and one central jet in pp collisions at sqrt(s) = 7 TeV

CMS Collaboration

摘要:

在横动量pt = 35-150 GeV/c范围内,用LHC的CMS实验测量了在sqrt(s)= 7 TeV的质子-质子碰撞中,前向喷流以及至少一个喷流在中心而另一个喷流在前向赝顶点的双喷流事件中的包含性产生截面.前向喷流的测量值在伪顶点3.2< |eta| <4.7范围内,中心喷流的测量值在|eta| <2.8范围内。关于pt和eta的双微分截面与微扰量子色动力学中的三种方法的预测进行了比较:(i)在与部分子簇射蒙特卡罗模拟匹配和不匹配的情况下获得的次领先阶计算,(ii)具有不同参数调谐的PYTHIA和HERWIG部分子簇射事件发生器,以及(iii)CASCADE和HEJ模型,包括对标准单部分子辐射的不同非共线修正。所有模型都很好地描述了单喷流包容性前向喷流谱,但并非所有的预测都与前向中心双喷流事件观察到的谱一致。

英文摘要:

The inclusive production cross sections for forward jets, as well for jets in dijet events with at least one jet emitted at central and the other at forward pseudorapidities, are measured in the range of transverse momenta pt = 35-150 GeV/c in proton-proton collisions at sqrt(s) = 7 TeV by the CMS experiment at the LHC. Forward jets are measured within pseudorapidities 3.2<|eta|<4.7, and central jets within the |eta|<2.8 range. The double differential cross sections with respect to pt and eta are compared to predictions from three approaches in perturbative quantum chromodynamics: (i) next-to-leading-order calculations obtained with and without matching to parton-shower Monte Carlo simulations, (ii) PYTHIA and HERWIG parton-shower event generators with different tunes of parameters, and (iii) CASCADE and HEJ models, including different non-collinear corrections to standard single-parton radiation. The single-jet inclusive forward jet spectrum is well described by all models, but not all predictions are consistent with the spectra observed for the forward-central dijet events.

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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