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arXiv 1309.7293hep-ph
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在高于NLO的高横向动量下生产WW

WW production at high transverse momenta beyond NLO

Francisco Campanario, Michael Rauch, Sebastian Sapeta

摘要:

W规范玻色子对的产生是LHC进入许多实验分析的重要过程,既作为新物理搜索或希格斯测量的背景,也作为精确研究和标准模型测试的信号。因此,这类过程的准确预测是非常感兴趣的,以充分利用大型强子对撞机测量的潜力。我们使用LoopSim方法结合WW和WW+喷流的NLO QCD结果,以及环平方胶子融合贡献,获得近似的WW生产的NNLO预测。截面计算与VBFNLO和包括轻子衰变的W玻色子以及有限宽度和离壳效应。我们发现,超出非线性光学的额外修正的大小可以是显着的,以及由重整化和因式分解尺度变化给出的非线性光学误差带之外。应用喷气否决权,我们观察到进一步的负面修正在NNLO,我们涉及到大Sudakov的存在。

英文摘要:

Pair production of W gauge bosons is an important process at the LHC entering many experimental analyses, both as background in new-physics searches or Higgs measurements and as signal in precision studies and tests of the Standard Model. Therefore, accurate predictions for this class of processes are of great interest in order to exploit the full potential of LHC measurements. We use the LoopSim method to combine NLO QCD results for WW and WW+jet, as well as the loop-squared gluon-fusion contribution, to obtain approximate NNLO predictions for WW production. The cross sections are calculated with VBFNLO and include leptonic decays of the W bosons as well as finite-width and off-shell effects. We find that the size of the additional corrections beyond NLO can be significant and well outside of the NLO error bands given by renormalization and factorization scale variation. Applying a jet veto, we observe further negative corrections at NNLO, which we relate to the presence of large Sudakov logarithms.

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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