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Investigating the universality of five-point QCD scattering amplitudes at high energy

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arxiv 2411.14050 v2 pith:IJWUYZSZ submitted 2024-11-21 hep-ph hep-th

Federico Buccioni , Fabrizio Caola , Federica Devoto , Giulio Gambuti This is my paper · ORCID
classification hep-phhep-th
keywords amplitudesscatteringfirstkinematicspredicttermstimeuniversal
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We investigate $2 \to 3$ QCD scattering amplitudes in multi-Regge kinematics, i.e. where the final partons are strongly ordered in rapidity. In this regime amplitudes exhibit intriguing factorisation properties which can be understood in terms of effective degrees of freedom called \emph{reggeons}. Working within the Balitsky/JIMWLK framework, we predict these amplitudes for the first time to next-to-next-to-leading logarithmic order, and compare against the limit of QCD scattering amplitudes in full colour and kinematics. We find that the latter can be described in terms of universal objects, and that the apparent non-universality arising at NNLL comes from well-defined and under-control contributions that we can predict. Thanks to this observation, we extract for the first time the universal vertex that controls the emission of the central-rapidity gluon, both in QCD and $N = 4$ super Yang-Mills.

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Cited by 5 Pith papers

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    hep-ph 2025-09 conditional novelty 6.0 of 10

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    hep-ph 2025-06 conditional novelty 6.0 of 10

    All tree-level QCD multi-Regge emission vertices with up to four final-state partons are extracted in a minimal lightcone-variable frame and collected in the MREV Mathematica library.

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