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Complete two-loop unrenormalized electroweak corrections to e+e−→HZ

Xiang Chen1,*, Xin Guan1,†, Chuan-Qi He1,2,‡, Zhao Li3,4,5,§, Xiao Liu6,∥, and Yan-Qing Ma1,5,¶

  • *Contact author: xchenphy@pku.edu.cn
  • †Contact author: guanxin0507@pku.edu.cn
  • ‡Contact author: legend_he@pku.edu.cn
  • §Contact author: zhaoli@ihep.ac.cn
  • ∥Contact author: xiao.liu@physics.ox.ac.uk
  • Contact author: yqma@pku.edu.cn
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Phys. Rev. D 114, 013003 – Published 8 July, 2026

DOI: https://doi.org/10.1103/5ssz-gr6j

Abstract

We compute the complete two-loop unrenormalized electroweak corrections to the Higgsstrahlung process e+e−→HZ at future Higgs factories. Our result for a given center-of-mass energy is expressed as a piecewise function defined by several deeply expanded power series, which has high precision and can be further manipulated efficiently. We find that the finite part of the unrenormalized two-loop electroweak corrections can contribute a few thousandths, which might indicate their importance to match the precision of future Higgs factories. This work represents the first complete calculation of the unrenormalized two-loop electroweak corrections for processes with four external particles.

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Phys. Rev. D 114, 013003– Published 8 July, 2026
  • Received 8 February 2023
  • Accepted 9 June 2026
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