Disentangling the Regge Cut and Regge Pole in Perturbative QCD
Giulio Falcioni, Einan Gardi, Niamh Maher, Calum Milloy, Leonardo Vernazza
Abstract
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.
Topics & Concepts
PhysicsPomeronCusp (singularity)Gravitational singularityPerturbative QCDQuantum chromodynamicsParticle physicsTrajectoryGluonLimit (mathematics)Quantum electrodynamicsQuantum mechanicsGeometryMathematical analysisMathematicsHigh-Energy Particle Collisions ResearchParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle Interactions