NLO QCD parton shower matching for $p p \rightarrow e^{+} \nu_e \mu^{-} \bar{\nu}_{\mu} \gamma + X$

TL;DR

This paper introduces a new interface in VBFNLO 3.0 for NLO+PS calculations of di-boson and tri-boson processes, demonstrating its effectiveness through a detailed study of tri-boson production with parton shower effects.

Contribution

The paper presents a novel interface in VBFNLO 3.0 enabling NLO+PS matched calculations for multi-boson processes with fully leptonic final states.

Findings

Parton shower effects significantly impact tri-boson production observables.

The interface allows for uncertainty estimation from scale variations.

Generation-level cuts influence the parton shower event characteristics.

Abstract

We present the implementation of a new interface in VBFNLO 3.0 supporting all di-boson and tri-boson processes with fully leptonic final states, enabling NLO+PS matched calculations. To demonstrate its capabilities, we study parton shower effects in the tri-boson production process $p p \rightarrow e^{+} \nu_e \mu^{-} \bar{\nu}_{\mu} \gamma + X$ using Herwig 7.3 with NLO QCD amplitudes from VBFNLO 3.0. We estimate uncertainties from scale variations and analyze the impact of generation-level cuts on parton shower events. This study showcases the new interface's potential and provides insights into the interplay between fixed-order calculations and parton shower effects in multi-boson production processes, crucial for precision measurements and BSM searches at the LHC and future colliders.