Electron EDM and LFV decays in the light of Muon with U(2) flavor symmetry

Morimitsu Tanimoto; Kei Yamamoto

doi:10.1140/epjc/s10052-024-12623-x

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 252
https://doi.org/10.1140/epjc/s10052-024-12623-x

Regular Article - Theoretical Physics I

Electron EDM and LFV decays in the light of Muon ${(g - 2)}_{μ}$ $(g-2)_\mu$ with U(2) flavor symmetry

Morimitsu Tanimoto¹ and Kei Yamamoto²^b

¹ Department of Physics, Niigata University, 950-2181, Niigata, Japan
² Department of Global Environment Studies, Hiroshima Institute of Technology, 731-5193, Hiroshima, Japan

^b k.yamamoto.e3@cc.it-hiroshima.ac.jp

Received: 19 December 2023
Accepted: 25 February 2024
Published online: 11 March 2024

Abstract

We study the interplay of New Physics (NP) among the lepton magnetic moment, the lepton flavor violation (LFV) and the electron electric dipole moment (EDM) in light of recent data of the muon ${(g - 2)}_{μ}$ $(g-2)_\mu$ . The NP is discussed in the leptonic dipole operator with the U(2) flavor symmetry of the charged leptons, where possible CP violating phases of the three family space are taken into account. It is remarked that the third-family contributes significantly to the LFV decay, $μ \to e γ$ $\mu \rightarrow e\gamma$ , and the electron EDM. The experimental upper-bound on $μ \to e γ$ $\mu \rightarrow e\gamma$ decay gives a severe constraint on the parameters of the flavor model. The predicted electron EDM is rather large due to the CP violating phases in the three family space. In addition, we also study ${(g - 2)}_{e, τ}$ $(g-2)_{e,\tau }$ of the electron and tauon, and EDMs of the muon and tauon as well as the $τ \to e γ$ $\tau \rightarrow e \gamma$ and $τ \to μ γ$ $\tau \rightarrow \mu \gamma$ decays. The $τ_{R} \to μ_{L} γ$ $\tau _R \rightarrow \mu _L \gamma$ decay is predicted to be close to the experimental upper-bound.

© The Author(s) 2024

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