Charged lepton flavor violating radiative decays l i → l j γ in G2HDM

Van Tran (Tsung Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China; Faculty of Fundamental Sciences, PHENIKAA University, Yen Nghia, Ha Dong, Hanoi, 12116, Vietnam) ; Tzu-Chiang Yuan (Institute of Physics, Academia Sinica, Nangang, Taipei, 11529, Taiwan)

We compute the electromagnetic form factors of the l i l j γ vertex at one-loop level in the minimal G2HDM which has a sub-GeV vector dark matter candidate. The results are applied to the radiative decay rates for the charged lepton flavor violating processes l i → l j γ, and the anomalous magnetic dipole moment and the electric dipole moment of the charged lepton. To numerically compute the branching ratio for μ → eγ and compare with the latest experimental limit from MEG, we adapt our previous parameter space scan that is consistent with the relic density and constraints from direct searches of dark matter, W and Z mass measurements, as well as the LHC Higgs signal strengths and invisible width. While the extra contributions are at least an order of magnitude smaller than required to explain the ~4.2σ discrepancy in the muon anomaly, the existing MEG limit imposes stringent constraint on the parameter space. The remaining viable parameter space can be further probed by the MEG II sensitivity for μ → eγ as well as from the direct searches of sub-GeV dark matter in foreseeable future. Higher loop contributions may be significant to resolve the discrepancy in the muon anomaly and generate a non-vanishing electric dipole moments for the standard model quarks and leptons in G2HDM.

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      "surname": "Yuan", 
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      "title": "Charged lepton flavor violating radiative decays l  i  \u2192 l  j  \u03b3 in G2HDM"
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      "source": "Springer", 
      "value": "We compute the electromagnetic form factors of the l  i  l  j  \u03b3 vertex at one-loop level in the minimal G2HDM which has a sub-GeV vector dark matter candidate. The results are applied to the radiative decay rates for the charged lepton flavor violating processes l  i  \u2192 l  j  \u03b3, and the anomalous magnetic dipole moment and the electric dipole moment of the charged lepton. To numerically compute the branching ratio for \u03bc \u2192 e\u03b3 and compare with the latest experimental limit from MEG, we adapt our previous parameter space scan that is consistent with the relic density and constraints from direct searches of dark matter, W and Z mass measurements, as well as the LHC Higgs signal strengths and invisible width. While the extra contributions are at least an order of magnitude smaller than required to explain the ~4.2\u03c3 discrepancy in the muon anomaly, the existing MEG limit imposes stringent constraint on the parameter space. The remaining viable parameter space can be further probed by the MEG II sensitivity for \u03bc \u2192 e\u03b3 as well as from the direct searches of sub-GeV dark matter in foreseeable future. Higher loop contributions may be significant to resolve the discrepancy in the muon anomaly and generate a non-vanishing electric dipole moments for the standard model quarks and leptons in G2HDM."
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Published on:
13 February 2023
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2023 (2023)
Issue 2
Pages 1-30
DOI:
https://doi.org/10.1007/JHEP02(2023)117
arXiv:
2212.02333
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: