Polarised W+j production at the LHC: a study at NNLO QCD accuracy

TL;DR

This paper provides precise NNLO QCD predictions for W-boson polarization in W+jet production at the LHC, improving the extraction of polarization fractions and comparing with experimental data.

Contribution

It introduces new NNLO QCD calculations for W-boson polarization in W+jet events, enhancing the accuracy of polarization fraction determination.

Findings

NNLO corrections significantly improve polarization fraction fits

Comparison between inclusive, fiducial, and off-shell phase spaces

Better agreement with experimental data at NNLO accuracy

Abstract

We study polarisation of W-bosons produced in association with one jet at the LHC. In particular, we provide all necessary theoretical ingredients for the precise extraction of polarisation fractions. To that end, we present new polarised predictions up to NNLO QCD accuracy employing the narrow-width approximation, in two phase spaces: inclusive and fiducial. We compare results in the fiducial phase space to a full off-shell computation as well as experimental data. Finally, we fit the polarisation fractions using shape templates and show that NNLO corrections significantly improve their determination.