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  • Letter
  • Open Access

Next-to-leading-order electroweak correction to H→Z0γ

Wen-Long Sang1,*, Feng Feng2,3,†, and Yu Jia3,4,‡

  • *Contact author: wlsang@swu.edu.cn
  • †Contact author: f.feng@outlook.com
  • ‡Contact author: jiay@ihep.ac.cn
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Phys. Rev. D 110, L051302 – Published 27 September, 2024

DOI: https://doi.org/10.1103/PhysRevD.110.L051302

Abstract

Inspired by the recent observation of the Higgs boson radiative decay into Z0 by ATLAS and CMS Collaborations, we investigate the next-to-leading-order (NLO) electroweak correction to this rare decay process in Standard Model (SM). Implementing the on shell renormalization scheme, we find that the magnitude of the NLO electroweak correction may reach 7% of the leading-order (LO) prediction, much more significant than that of the NLO QCD correction, which is merely about 0.3%. After incorporating the O(α) correction, the predicted partial width from various α schemes tend to converge to each other. Including both NLO electroweak and QCD corrections, the SM prediction for the branching fraction shifts from the LO value of (1.40–1.71)×10−3 to (1.55±0.06)×10−3, considerably lower than the measured value Bexp[H→Z0γ]=(3.4±1.1)×10−3. Resolving this discrepancy clearly calls for further theoretical investigations, and, more importantly, experimental efforts from HL-LHC and the prospective Higgs factories such as CEPC and FCC-ee.

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Phys. Rev. D 110, L051302– Published 27 September, 2024
  • Received 7 May 2024
  • Accepted 26 August 2024
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