NLO corrections to hard process in QCD shower -- proof of concept

TL;DR

This paper introduces and tests a new methodology for incorporating NLO QCD corrections into initial state Monte Carlo parton showers, demonstrating its practical effectiveness through numerical simulations of heavy boson production at colliders.

Contribution

The paper presents a novel approach for adding NLO corrections to QCD parton showers, validated through numerical tests in a simplified heavy boson production model.

Findings

The new methodology correctly incorporates NLO corrections in Monte Carlo simulations.

Numerical results show agreement with theoretical expectations.

Differences with existing methods like MC@NLO and POWHEG are discussed.

Abstract

The concept of new methodology of adding QCD NLO corrections in the initial state Monte Carlo parton shower (hard process part) is tested numerically using, as an example, the process of the heavy boson production at hadron--hadron colliders such as LHC. In spite of the use of a simplified model of the process, all presented numerical results prove convincingly that the basic concept of the new methodology works correctly in practice, that is in the numerical environment of the Monte Carlo parton shower event generator. The differences with the other well established methods, like MC@NLO and POWHEG, are briefly discussed and future refinements of the implementation of the new method are also outlined.