$W^+W^-$ production at NNLO+PS

TL;DR

This paper provides highly precise predictions for W+W- production at colliders by combining NNLO calculations with parton shower simulations, ensuring accurate modeling of both inclusive and differential observables.

Contribution

It introduces a novel method to match NNLO calculations with parton showers for W+W- production using MiNLO and reweighting techniques, enhancing prediction accuracy.

Findings

Achieves NNLO+PS accuracy for W+W- production

Guarantees NLO accuracy for inclusive observables

Provides differential predictions consistent with NNLO results

Abstract

We present predictions for $W^+W^-$ production (with exact decays) that are next-to-next-to-leading order (NNLO) accurate and consistently matched to a parton shower. The matching is achieved by upgrading, with MiNLO, the NLO calculation of $W^+W^- +1$ jet production, in such a way that NLO accuracy is guaranteed for $W^+W^-$ inclusive observables, and by performing subsequently a reweighting of the WWJ-MiNLO events, differential in the $W^+W^-$ Born variables, to the NNLO results obtained with MATRIX.