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15 February 2025
 
  » arxiv » 1508.0227

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Constraining gluon poles
I.V. Anikin ; O.V. Teryaev ;
Date 2 Aug 2015
AbstractIn the letter, we revise the QED gauge invariance for the hadron tensor of Drell-Yan type processes with the transversely polarized hadron. We perform our analysis within the Feynman gauge for gluons and make a comparison with the results obtained within the light-cone gauge. We demonstrate that QED gauge invariance leads, first, to the need of a non-standard diagram and, second, to the absence of gluon poles in the correlators $langlearpsigamma_perp A^+psi angle$ related traditionally to $dT(x,x)/dx$. As a result, these terms disappear from the final QED gauge invariant hadron tensor. We also verify the absence of such poles by the analysis of the light-cone Dirac algebra.
Source arXiv, 1508.0227
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