Ordering multiple soft gluon emissions using Glauber-SCET
arXiv:2108.13439 · doi:10.1103/PhysRevD.104.L091501
Abstract
In QCD, the amplitude for multiple soft gluon emissions has been shown to exhibit a form of coherence, wherein one-loop corrections are rendered IR finite by the transverse momentum of the real emissions. Using a sequence of soft-collinear effective theories (SCET) with Glauber operators, we present a compact and elegant derivation of this property. Our derivation highlights an important role played by the Lipatov vertex. The EFT approach provides increased physical intuition and, for the first time, a clear road map for how this result can be extended to higher loop orders.
arXiv comment5 pages, 2 figures
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