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Non-abelian infrared divergences on the celestial sphere

Articolo
Data di Pubblicazione:
2021
Abstract:
We consider the infrared factorisation of non-abelian multi-particle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the ‘celestial sphere’ intersecting the future light-cone at asymptotic distances. We find that colour-dipole contributions to the infrared operator, to all orders in perturbation theory, have a remarkably simple expression in these coordinates, with scale and coupling dependence factorised from kinematics and colour. Generalising earlier suggestions in the abelian theory, we then show that the infrared operator can be computed as a correlator of vertex operators in a conformal field theory of Lie-algebra-valued free bosons on the celestial sphere. We verify by means of the OPE that the theory correctly predicts the all-order structure of collinear limits, and the tree-level factorisation of soft real radiation.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Conformal Field Theory; Perturbative QCD; Scattering Amplitudes
Elenco autori:
Magnea L.
Autori di Ateneo:
MAGNEA Lorenzo
Link alla scheda completa:
https://iris.unito.it/handle/2318/1808676
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1808676/1390896/JHEP_21_05_282.pdf
Pubblicato in:
JOURNAL OF HIGH ENERGY PHYSICS
Journal
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Dati Generali

URL

https://link.springer.com/article/10.1007/JHEP05(2021)282

Aree Di Ricerca

Settori (4)


PE2_1 - Theory of fundamental interactions - (2024)

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Cosmologia e Universo

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Fisica delle Particelle e dei Nuclei

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Laboratori innovativi, strumentazione e modellizzazione fisica
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