Open access
Datum
2023-01Typ
- Journal Article
Abstract
We compute the tree-level current for the emission of a soft quark-antiquark pair in association with a gluon. This soft current is the last missing ingredient to understand the infrared singularities that can arise in next-to-next-to-next-to-leading-order (N3LO) computations in QCD. Its square allows us to understand for the first time the colour correlations induced by the soft emission of a quark pair and a gluon. We find that there are three types of correlations: besides dipole-type correlations that have already appeared in soft limits of tree-level amplitudes, we uncover for the first time also a three-parton correlation involving a totally symmetric structure constant. We also study the behaviour of collinear splitting amplitudes in the triple-soft limit, and we derive the corresponding factorisation formula. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000594622Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Journal of High Energy PhysicsBand
Seiten / Artikelnummer
Verlag
SpringerThema
Factorization; Renormalization group; Higher-Order Perturbative Calculations