Extending CKKW-merging to One-Loop Matrix Elements

TL;DR

This paper advances the merging of matrix elements with parton showers by incorporating one-loop corrections across multiple jet multiplicities, demonstrated through a proof-of-concept study at LEP.

Contribution

It introduces a novel scheme for merging one-loop matrix elements with parton showers across various jet multiplicities.

Findings

Successful extension of merging scheme to include one-loop corrections

First study on simultaneous inclusion of multiple jet multiplicities

Proof-of-concept results for hadronic events at LEP

Abstract

We extend earlier schemes for merging tree-level matrix elements with parton showers to include also merging with one-loop matrix elements. In this paper we make a first study on how to include one-loop corrections, not only for events with a given jet multiplicity, but simultaneously for several different jet multiplicities. Results are presented for the simplest non-trivial case of hadronic events at LEP as a proof-of-concept.