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This work aims at illustrating that, for a class of leading-twist hardexclusive reactions involving two heavy quarkonia, the light-cone approach,when equipped with the strategy of refactorization of the light-conedistribution amplitude of quarkonium, can be employed to elegantly reproducethe corresponding predictions made in the nonrelativistic QCD (NRQCD)factorization approach, order by order in perturbative expansion. Taking theelectromagnetic form factor of the $B_c$ meson at large momentum transfer,$Q^2$, as a concrete example, we compare the results obtained from bothNRQCD-based and light-cone-based calculations through the next-to-leading order(NLO) in $\alpha_s$, while at the leading order (LO) in both velocity and$1/Q^2$ expansion, and explicitly confirm their mutual agreement. As abyproduct, we apply our NLO result to explore certain features about theasymptotic behavior of the heavy-light meson form factor. We also address themajor theoretical obstacles that prevent us from establishing an analogousequivalence between these two approaches for the double charmonium productionprocess of phenomenological interest, $e^+e^-\to J/\psi+\eta_c$.

Bridging light-cone and NRQCD approaches: asymptotic behavior of $B_c$ electromagnetic form factor