Towards colour flow evolution at two loops

Journal of High Energy Physics

Simon Plätzer¹  Ines Ruffa¹ 

[1] Particle Physics, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090, Wien, Austria;Erwin-Schrödinger-Institute for Mathematics and Physics, University of Vienna, Boltzmanngasse 9, 1090, Wien, Austria;

关键词: Perturbative QCD;    Resummation;   

DOI  :  10.1007/JHEP06(2021)007

来源: Springer

【 摘 要 】

We calculate the two-loop and one-loop/one-emission contributions required for soft gluon evolution at the next-to-leading order. The colour structures are expressed in the colour flow basis, and the kinematic dependence and loop integrals are expressed in terms of multiple cuts and phase-space-like integrals. This directly allows to use them in the resummation of non-global observables and improved parton shower algorithms beyond the leading order and beyond the leading colour limit. Within the colour flow basis it becomes apparent that correlations beyond a dipole picture emerge even in colour-diagonal elements of the virtual corrections.

【 授权许可】

CC BY