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Lepton Flavor Violating $l \to l' γ$ and $Z \to l \bar l'$ Decays Induced by Scalar Leptoquarks

Motivated by the recent muon $g-2$ data, we study the lepton flavor violating $l \to l' γ$ and $Z \to l \bar l'$ ($l, l' = e, μ, τ$) decays with $l \neq l'$ in a scalar leptoquark model. Leptoquarks can produce sizable LFV $l\to l'γ$ decay rates that can be easily reached by present or near future experiments. % Leptoquark masses and couplings are constrained by the muon $g-2$ data and the current $l \to l' γ$ bounds. We predict $Br(Z \to τ^\mp e^\pm)$ reaching the present limit ($10^{-5}$) and $Br(Z \to μ^\mp τ^\pm)$ reaching $2\times 10^{-8}$, which will be accessible by future linear colliders, whereas, the current bounds on LFV impose very strong constraints on the $Br(Z \to μ^\mp e^\pm)$ and the ratio is too low to be observed in the near future.