Constraining gluon poles

I. V. Anikin; O. V. Teryaev

doi:10.1016/j.physletb.2015.10.088

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arXiv · 1508.00227

Constraining gluon poles

I. V. Anikin·O. V. Teryaev

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Abstract

In this 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 $\langle\barψγ_\perp A^+ψ\rangle$ 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 analysing the corresponding light-cone Dirac algebra.

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I. V. Anikin, O. V. Teryaev. 2015-11-02. Constraining gluon poles. https://doi.org/10.1016/j.physletb.2015.10.088

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