Coulomb gluons and the ordering variable
Ren\'e \'Angeles-Mart\'inez, Jeffrey R. Forshaw, Michael H. Seymour
TL;DR
This paper investigates Coulomb (Glauber) gluon exchanges in QCD, revealing a cancellation pattern that enforces a specific transverse momentum ordering, enhancing understanding of their all-order contributions.
Contribution
It provides a detailed analysis of Coulomb gluon exchanges and uncovers a cancellation mechanism that dictates the transverse momentum ordering in QCD perturbation theory.
Findings
Cancellation of certain gluon exchange graphs
Imposition of a transverse momentum ordering
Insights into all-order Coulomb gluon contributions
Abstract
We study in detail the exchange of a Coulomb (Glauber) gluon in the first few orders of QCD perturbation theory in order to shed light on their accounting to all orders. We find an elegant cancellation of graphs that imposes a precise ordering on the transverse momentum of the exchanged Coulomb gluon.
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