Unstable-particles pair production in MPTapproach in NNLO

TL;DR

This paper presents a numerical NNLO analysis of unstable particle pair production and decay using a modified perturbation theory that handles resonant contributions as distributions, incorporating universal massless-particles effects.

Contribution

It introduces a modified perturbation theory approach for NNLO calculations of unstable particle processes, emphasizing resonant contributions as distributions.

Findings

Numerical simulation results up to NNLO accuracy.

Inclusion of universal massless-particles contributions.

Demonstration of the method's applicability to unstable particle processes.

Abstract

We consider pair production and decay of fundamental unstable particles in the framework of a modified perturbation theory treating resonant contributions in the sense of distributions. Outcomes of a numerical simulation up to the NNLO with taking into account universal massless-particles contributions are presented.