Investigating the universality of five-point QCD scattering amplitudes at high energy
Abstract We investigate 2 → 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 reggeons. Wo...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-03-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP03(2025)129 |
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| author | Federico Buccioni Fabrizio Caola Federica Devoto Giulio Gambuti |
| author_facet | Federico Buccioni Fabrizio Caola Federica Devoto Giulio Gambuti |
| author_sort | Federico Buccioni |
| collection | DOAJ |
| description | Abstract We investigate 2 → 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 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 $$ \mathcal{N} $$ = 4 super Yang-Mills. |
| format | Article |
| id | doaj-art-1ec253297785401e9cce1ded79edd79f |
| institution | DOAJ |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-1ec253297785401e9cce1ded79edd79f2025-08-20T03:06:48ZengSpringerOpenJournal of High Energy Physics1029-84792025-03-012025316010.1007/JHEP03(2025)129Investigating the universality of five-point QCD scattering amplitudes at high energyFederico Buccioni0Fabrizio Caola1Federica Devoto2Giulio Gambuti3Physik Department, Technische Universität MünchenRudolf Peierls Centre for Theoretical Physics, Clarendon Laboratory, University of OxfordRudolf Peierls Centre for Theoretical Physics, Clarendon Laboratory, University of OxfordRudolf Peierls Centre for Theoretical Physics, Clarendon Laboratory, University of OxfordAbstract We investigate 2 → 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 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 $$ \mathcal{N} $$ = 4 super Yang-Mills.https://doi.org/10.1007/JHEP03(2025)129FactorizationRenormalization GroupResummationHigher-Order Perturbative Calculations |
| spellingShingle | Federico Buccioni Fabrizio Caola Federica Devoto Giulio Gambuti Investigating the universality of five-point QCD scattering amplitudes at high energy Journal of High Energy Physics Factorization Renormalization Group Resummation Higher-Order Perturbative Calculations |
| title | Investigating the universality of five-point QCD scattering amplitudes at high energy |
| title_full | Investigating the universality of five-point QCD scattering amplitudes at high energy |
| title_fullStr | Investigating the universality of five-point QCD scattering amplitudes at high energy |
| title_full_unstemmed | Investigating the universality of five-point QCD scattering amplitudes at high energy |
| title_short | Investigating the universality of five-point QCD scattering amplitudes at high energy |
| title_sort | investigating the universality of five point qcd scattering amplitudes at high energy |
| topic | Factorization Renormalization Group Resummation Higher-Order Perturbative Calculations |
| url | https://doi.org/10.1007/JHEP03(2025)129 |
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