  Motivated by an experimental proposal for the measurement of the pi N --> pi
pi N reactions at J-PARC, we examine a potential impact of the pi N --> pi pi N
cross section data on the determination of the resonance parameters of the
high-mass N* states. For this purpose, we make use of the ANL-Osaka dynamical
coupled-channels model, which has been developed recently by a combined
analysis of the unpolarized as well as polarized observables of pion- and
photon-induced pi N, eta N, K Lambda, and K Sigma production reactions off a
proton target. We present predictions for the pi N --> pi pi N total cross
sections and invariant mass distributions, and demonstrate that the pi N --> pi
pi N differential cross section data can indeed be a crucial source of
information for understanding N* --> pi Delta, rho N, sigma N --> pi pi N decay
of the high-mass N* states.
