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arXiv 1802.01620hep-thhep-ph
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QCD和双色振幅的KLT型关系

KLT-type relations for QCD and bicolor amplitudes from color-factor symmetry

Robert W. Brown, Stephen G. Naculich

摘要:

利用色因子对称性导出了包含胶子和任意数量的有质量或无质量夸克-反夸克对的树能级QCD振幅的KLT型关系,推广了最初由Bern,De Freitas和Wong假设的Yang-Mills振幅的表达式。对于含有两个或两个以下夸克-反夸克对的所有振幅,我们用(修正的)动量核给出了一个显式表达式。我们还介绍了双色标量理论,QCD的“零副本”,包含无质量的双伴随标量和大量的双基本标量,推广了Cachazo,He和Yuan的双伴随标量理论。我们推导出KLT型关系的树级振幅的双伴随和双色理论使用的颜色因子对称性,这些理论。

英文摘要:

Color-factor symmetry is used to derive a KLT-type relation for tree-level QCD amplitudes containing gluons and an arbitrary number of massive or massless quark-antiquark pairs, generalizing the expression for Yang-Mills amplitudes originally postulated by Bern, De Freitas, and Wong. An explicit expression is given for all amplitudes with two or fewer quark-antiquark pairs in terms of the (modified) momentum kernel. We also introduce the bicolor scalar theory, the "zeroth copy" of QCD, containing massless biadjoint scalars and massive bifundamental scalars, generalizing the biadjoint scalar theory of Cachazo, He, and Yuan. We derive KLT-type relations for tree-level amplitudes of biadjoint and bicolor theories using the color-factor symmetry possessed by these theories.

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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