Coherent Parton Showers with Local Recoils

TL;DR

This paper introduces a new formalism for dipole parton showers that ensures exact energy-momentum conservation and coherence, improving the modeling of soft gluon radiation and facilitating matching with higher-order calculations.

Contribution

A novel dipole shower formalism that maintains energy-momentum conservation and coherence, enhancing accuracy and compatibility with NLO calculations.

Findings

Correctly incorporates coherence for soft gluon radiation

Ensures exact energy-momentum conservation at each evolution step

Facilitates matching to next-to-leading order calculations

Abstract

We outline a new formalism for dipole-type parton showers which maintain exact energy-momentum conservation at each step of the evolution. Particular emphasis is put on the coherence properties, the level at which recoil effects do enter and the role of transverse momentum generation from initial state radiation. The formulated algorithm is shown to correctly incorporate coherence for soft gluon radiation. Furthermore, it is well suited for easing matching to next-to-leading order calculations.