Higgsstrahlung at NNLL$'+$NNLO Matched to Parton Showers in GENEVA

TL;DR

This paper introduces a new method for simulating Higgsstrahlung at the LHC by combining NNLO calculations with NNLL' resummation and parton showers, improving accuracy for inclusive and 0-jet observables.

Contribution

It presents a novel matching of NNLO calculations with NNLL' resummation in the GENEVA framework, enhancing precision in Higgsstrahlung simulations.

Findings

Accurate NNLO predictions for Higgsstrahlung at 13 TeV LHC.

Improved description of 0-jet-like observables beyond standard parton showers.

Systematic assessment of perturbative uncertainties.

Abstract

We present results for the Higgsstrahlung process within the GENEVA Monte Carlo framework. We combine the fully differential NNLO calculation with the higher-order resummation in the 0-jettiness resolution variable (beam-thrust). The resulting parton-level events are further showered and hadronised by Pythia8. The beam-thrust resummation is carried out to NNLL$'$ accuracy, which consistently incorporates all singular virtual and real NNLO corrections. It thus provides a natural perturbative connection between the NNLO calculation and the parton shower regime, including a systematic assessment of perturbative uncertainties. In this way, observables which are inclusive over the additional radiation are correct to NNLO, while the description of 0-jet-like resummation variables is improved beyond the parton shower approximation. We provide predictions for the 13 TeV LHC.