### Speaker

### Description

The Argonne-Osaka dynamical coupled-channels (DCC) approach provides a unified description of various electroweak meson productions on single nucleon and nucleus. The model can be used, for example, to extract properties of nucleon resonances through a comprehensive analysis of reaction data, and to evaluate nuclear effects involved in the reactions, thereby enabling us to obtain information of interest.

In the former part of the presentation, I discuss the DCC model of a single nucleon. The model includes $\pi N$, $\pi\pi N$, $\eta N$, $K\Lambda$, and $K\Sigma$ stable channels and also $\pi\Delta$, $\sigma N$, and $\rho N$ unstable channels that are gateway to the $\pi\pi N$ channel. The DCC model is developed through a comprehensive analysis of $\pi N, \gamma N\to \pi N, \eta N, K\Lambda, K\Sigma$ reaction data from the thresholds up to $W=2.1$ GeV. This model is further extended to finite $Q^2$ by analyzing pion electroproduction data, and to neutrino-induced reactions using the PCAC relation between the axial currents and $\pi N$ amplitudes.

In the latter part of the presentation, I discuss applications of the DCC model to electroweak meson productions on the deuteron. We consider impulse mechanism supplemented by final state interactions (FSI) due to $NN$ and meson-nucleon rescatterings. Predictions from this model turn out to be in good agreement with existing data. Using this model, I discuss a novel method to extract $\eta N$ scattering length and effective range, and FSI corrections needed to extract $\gamma$-neutron reaction observables from $\gamma$-deuteron data. Finally, I discuss FSI corrections on the existing neutrino-nucleon data, which are important for neutrino-oscillation experiments, that had been extracted from neutrino-deuteron data.

Early Consideration | No |
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Graduate Student | No |