Factorisation and subtraction beyond NLO

A bstract We provide a general method to construct local infrared subtraction counterterms for unresolved radiative contributions to differential cross sections, to any order in perturbation theory. We start from the factorised structure of virtual corrections to scattering amplitudes, where soft an...

Full description

Saved in:

Bibliographic Details
Published in:	The journal of high energy physics 2018-12, Vol.2018 (12), p.1-31, Article 62
Main Authors:	Magnea, L., Maina, E., Pelliccioli, G., Signorile-Signorile, C., Torrielli, P., Uccirati, S.
Format:	Article
Language:	eng
Subjects:	Classical and Quantum Gravitation Elementary Particles Form factors Jets Perturbation theory Physics Physics and Astronomy QCD Phenomenology Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Theoretical Physics Relativity Theory Singularities String Theory Subtraction
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	A bstract We provide a general method to construct local infrared subtraction counterterms for unresolved radiative contributions to differential cross sections, to any order in perturbation theory. We start from the factorised structure of virtual corrections to scattering amplitudes, where soft and collinear divergences are organised in gauge-invariant matrix elements of fields and Wilson lines, and we define radiative eikonal form factors and jet functions which are fully differential in the radiation phase space, and can be shown to cancel virtual poles upon integration by using completeness relations and general theorems on the cancellation of infrared singularities. Our method reproduces known results at NLO and NNLO, and yields substantial simplifications in the organisation of the subtraction procedure, which will help in the construction of efficient subtraction algorithms at higher orders.
ISSN:	1029-8479 1029-8479