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A new two-loop radiative Majorana neutrino mass model is constructed from thegauge-invariant effective operator $L^i L^j Q^k d^c Q^l d^c \epsilon_{ik}\epsilon_{jl}$ that violates lepton number conservation by two units. Theultraviolet completion features two scalar leptoquark flavors and a color-octetMajorana fermion. We show that there exists a region of parameter space wherethe neutrino oscillation data can be fitted while simultaneously meetingflavor-violation and collider bounds. The model is testable through leptonflavor-violating processes such as ${\mu} \to e{\gamma}$, $\mu \to eee$, and$\mu N \to eN$ conversion, as well as collider searches for the scalarleptoquarks and color-octet fermion. We computed and compiled a list ofnecessary Passarino-Veltman integrals up to boxes in the approximation ofvanishing external momenta and made them available as a Mathematica package,denoted as ANT.

Testable two-loop radiative neutrino mass model based on an $LLQd^cQd^c$ effective operator