Disentangling the Regge Cut and Regge Pole in Perturbative QCD

Giulio Falcioni, Einan Gardi, Niamh Maher, Calum Milloy, Leonardo Vernazza

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The high-energy limit of gauge-theory amplitudes features both a Regge pole and Regge cuts. We show how to disentangle these, and hence how to determine the Regge trajectory beyond two loops. While the nonplanar part of multiple Reggeon t-channel exchange forms a Regge cut, the planar part contributes to the pole along with the single Reggeon. With this, we find that the infrared singularities of the trajectory are given by the cusp anomalous dimension. By matching to recent QCD results, we determine the quark and gluon impact factors to two loops and the Regge trajectory to three loops.
Original languageEnglish
Article number132001
Pages (from-to)1-7
Number of pages7
JournalPhysical Review Letters
Volume128
Issue number13
Early online date30 Mar 2022
DOIs
Publication statusPublished - 1 Apr 2022

Keywords / Materials (for Non-textual outputs)

  • hep-ph
  • hep-th

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