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I overview our recent activity with the Argonne-Osaka dynamicalcoupled-channels (DCC) approach that provides a unified description of variouselectroweak meson productions on single nucleon and nucleus. First I discussthe DCC model of a single nucleon. The DCC model has been developed through acomprehensive analysis of $\pi N, \gamma N\to \pi N, \eta N, K\Lambda, K\Sigma$reaction data. The model has been further extended to finite $Q^2$ region byanalyzing pion electroproduction data, and to neutrino-induced reactions usingthe PCAC relation. Next I discuss applications of the DCC model to electroweakmeson productions on the deuteron. We consider impulse mechanism supplementedby final state interactions (FSI) due to $NN$ and meson-nucleon rescatterings.Using this model, I discuss FSI corrections needed to extract $\gamma$-neutronreaction observables from $\gamma d\to \pi NN$, and a novel method to extract$\eta N$ scattering length from $\gamma d\to \eta pn$. I also discuss FSIcorrections on the existing neutrino-nucleon pion production data that had beenextracted from neutrino-deuteron data.

Dynamical coupled-channels approach to electroweak meson productions on nucleon and deuteron