e+e− → ZH at NLO EW matched to a QED parton shower
- 1University of Liverpool
- 2Durham University
Abstract
A bstract : To prepare for the next generation particle collider, likely to be a high-energy precision-frontier electron-positron machine, theoretical predictions must improve in tandem. One aspect in which it is necessary to build on the progress made at LEP and at low-energy e ⁺ e ⁻ colliders is in the modelling of initial-state QED radiation from leptons. In this paper we combine the Mc@Nlo parton shower matching method with QED resummation methods such as the electron structure function to obtain an automated, process-independent NLO-matched QED parton shower. The case of an electron-positron collider provides a particular challenge to the method due to the integrable singularity present in the lepton structure function, at variance with QCD PDFs. We develop new methods to allow a standard dipole parton shower to operate in the presence of this singularity. We validate the method by examining its dependence on infrared parameters and by verifying both the NLO-correctness, and the resummation properties, of the Mc@Nlo prediction. Finally, we present results for the case of Higgs production in association with an on-shell Z boson at two proposed FCC-ee energies, the first such predictions at EW NLO+PS accuracy.
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BibTeX
@article{flower2026matched,
title = {{e+e− → ZH at NLO EW matched to a QED parton shower}},
author = {Lois Flower and Marek Schönherr},
journal = {Journal of High Energy Physics},
year = {2026},
month = oct,
doi = {10.1007/jhep10(2026)247},
url = {https://link.springer.com/article/10.1007/JHEP10(2026)247},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - e+e− → ZH at NLO EW matched to a QED parton shower
AU - Lois Flower
AU - Marek Schönherr
PY - 2026
DA - 2026/10/23
JO - Journal of High Energy Physics
DO - 10.1007/jhep10(2026)247
UR - https://link.springer.com/article/10.1007/JHEP10(2026)247
AB - A bstract : To prepare for the next generation particle collider, likely to be a high-energy precision-frontier electron-positron machine, theoretical predictions must improve in tandem. One aspect in which it is necessary to build on the progress made at LEP and at low-energy e ⁺ e ⁻ colliders is in the modelling of initial-state QED radiation from leptons. In this paper we combine the Mc@Nlo parton shower matching method with QED resummation methods such as the electron structure function to obtain an automated, process-independent NLO-matched QED parton shower. The case of an electron-positron collider provides a particular challenge to the method due to the integrable singularity present in the lepton structure function, at variance with QCD PDFs. We develop new methods to allow a standard dipole parton shower to operate in the presence of this singularity. We validate the method by examining its dependence on infrared parameters and by verifying both the NLO-correctness, and the resummation properties, of the Mc@Nlo prediction. Finally, we present results for the case of Higgs production in association with an on-shell Z boson at two proposed FCC-ee energies, the first such predictions at EW NLO+PS accuracy.
SN - 1029-8479
ER -