Disentangling the Regge cut and Regge pole in perturbative QCD

Autor:	Falcioni, Giulio, Gardi, Einan, Maher, Niamh, Milloy, Calum, Vernazza, Leonardo
Rok vydání:	2021
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Theory
Zdroj:	Phys.Rev.Lett. 128 (2022) 13, 132001
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.128.132001
Popis:	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. Comment: 7 pages, 2 figures; v2: comments regarding the supersymmetric case added, to appear in Phys. Rev. Lett; v3: added ancillary file
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2112.11098 Zobrazit plný text záznamu View this record from Arxiv