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Disentangling the Regge cut and Regge pole in perturbative QCD

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arxiv 2112.11098 v3 pith:G6KRUCAV submitted 2021-12-21 hep-ph hep-th

Disentangling the Regge cut and Regge pole in perturbative QCD

Giulio Falcioni , Einan Gardi , Niamh Maher , Calum Milloy , Leonardo Vernazza This is my paper
classification hep-ph hep-th
keywords reggeloopspoletrajectorydeterminepartreggeonalong
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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