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PreprintCC BY 4.0arXiv

Radiative and Dalitz decays of Υ(1S) in the light of the ATOMKI X17 anomaly

  • Chien-Thang Tran
  • Mikhail A. Ivanov
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Abstract

We study the radiative decay Υ(1S)→ ηbγ and the Dalitz decay Υ(1S)→ ηb e+ e- within the framework of the Covariant Confined Quark Model. We provide theoretical predictions for the hadronic form factor, the radiative decay constant, and the decay branching fractions. Within the Standard Model we predict Γ(Υ(1S)→ηb γ) = 9.3(9) eV and Γ(Υ(1S)→ηb e+ e-) = 4.8(5)× 10−2 eV. The contribution of the hypothetical ATOMKI X17 vector boson to the Dalitz channel is also investigated.

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Cite

BibTeXRIS
BibTeX
@misc{tran2026radiative,
  title = {{Radiative and Dalitz decays of $Υ(1S)$ in the light of the ATOMKI X17 anomaly}},
  author = {Chien-Thang Tran and Mikhail A. Ivanov},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.02874},
  eprint = {2609.02874},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.02874},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Radiative and Dalitz decays of Υ(1S) in the light of the ATOMKI X17 anomaly
AU  - Chien-Thang Tran
AU  - Mikhail A. Ivanov
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2609.02874
UR  - https://arxiv.org/abs/2609.02874
AB  - We study the radiative decay Υ(1S)→ η_bγ and the Dalitz decay Υ(1S)→ η_b e^+ e^- within the framework of the Covariant Confined Quark Model. We provide theoretical predictions for the hadronic form factor, the radiative decay constant, and the decay branching fractions. Within the Standard Model we predict Γ(Υ(1S)→η_b γ) = 9.3(9) eV and Γ(Υ(1S)→η_b e^+ e^-) = 4.8(5)× 10^−2 eV. The contribution of the hypothetical ATOMKI X17 vector boson to the Dalitz channel is also investigated.
ER  -