  The Standard Model (SM), if augmented with a light SM-singlet scalar $\phi$
and a TeV-scale scalar leptoquark (LQ) $S_1$, 2-body charged lepton flavor
violating (CLFV) decay channels can be accessed with $\phi$ as one of the final
states, where the leading order effective interactions between $\phi$ and the
SM fields arise at one-loop level. Further, in the presence of $S_1$, $\phi$
can mediate 3-body CLFV processes with either two photons or two gluons in the
final states. Thus, the model predicts an exotic 3-body CLFV channel:
$\ell_A\to\ell_B gg$, which can be tested/constrained only through some future
high-energy experiments looking for di-gluon signals from a leptonic decay.
