A new approach to QCD final-state evolution in processes with massive partons

TL;DR

This paper introduces a novel algorithm for simulating massive parton evolution in QCD, incorporating soft-gluon radiation with azimuthal angle dependence, and demonstrates its implementation and initial comparison with experimental data.

Contribution

The paper develops a new algorithm for massive parton evolution that accurately models soft-gluon radiation and includes NLO matching, with implementation in the Alaric code.

Findings

Algorithm successfully models soft-gluon radiation with azimuthal dependence

Implementation in Alaric enables comparison with experimental data

Provides a framework for NLO matching in massive parton evolution

Abstract

We present an algorithm for massive parton evolution which is based on the differentially accurate simulation of soft-gluon radiation by means of a non-trivial azimuthal angle dependence of the splitting functions. The kinematics mapping is chosen such as to to reflect the symmetry of the final state in soft-gluon radiation and collinear splitting processes. We compute the counterterms needed for a fully differential NLO matching and discuss the analytic structure of the parton shower in the NLL limit. We implement the new algorithm in the numerical code Alaric and present a first comparison to experimental data.