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arXiv 1006.2144hep-ph
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超过NLO的巨大QCD K系数

Giant QCD K-factors beyond NLO

Mathieu Rubin, Gavin P. Salam, Sebastian Sapeta

摘要:

Z+喷流事件中的强子观测值在TeV尺度下可以受到大的NLO修正,K因子在某些情况下甚至达到50阶。我们开发了一种方法,LoopSim,通过它可以获得近似的NNLO预测这样的观测,补充NLO Z+喷气和NLO Z+2-喷气结果与基于么正性的近似丢失的高回路项。我们首先测试的方法对已知的非线性光学结果的Drell-Yan轻子PT谱。然后,我们展示了Z+喷流观测量的近似NNLO结果。最后,我们研究了LoopSim方法是否可以提供有用的信息,即使在没有巨大的K-因子的情况下,在dijet事件,可以比较早期LHC数据的观测结果。

英文摘要:

Hadronic observables in Z+jet events can be subject to large NLO corrections at TeV scales, with K-factors that even reach values of order 50 in some cases. We develop a method, LoopSim, by which approximate NNLO predictions can be obtained for such observables, supplementing NLO Z+jet and NLO Z+2-jet results with a unitarity-based approximation for missing higher loop terms. We first test the method against known NNLO results for Drell-Yan lepton pt spectra. We then show our approximate NNLO results for the Z+jet observables. Finally we examine whether the LoopSim method can provide useful information even in cases without giant K-factors, with results for observables in dijet events that can be compared to early LHC data.

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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