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arxiv: hep-ph/9908467 · v2 · submitted 1999-08-25 · ✦ hep-ph

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Infrared divergences and non-lightlike eikonal lines in Sudakov processes

J.C. Collins , F. Hautmann
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classification ✦ hep-ph
keywords contributionseikonalinfraredlinesnon-lightlikeprocessessudakovalong
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We propose a method to analyze infrared contributions to non-inclusive processes in QCD. We use the one-loop Sudakov form factor as a working example. Borrowing techniques from renormalization theory, we construct counterterms for the contributions from the soft and collinear regions, and we relate them to eikonal Wilson lines taken along non-lightlike directions.

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  1. The Fate of Ultra-Collinear Modes in On-Shell Massive Sudakov Form Factors

    hep-ph 2026-04 unverdicted novelty 6.0

    Ultra-collinear modes cancel to all orders in on-shell massive Sudakov form factors by gauge invariance, preserving SCET_II factorization, with explicit two-loop soft and jet functions computed via eta regulator and N...