Coupled-channels study of the π-p→ηn process

The reaction pi(-)p ->eta n is investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson baryon channels included are phi N, eta N, pi A, sigma N, and rho N. The nonresonant meson-baryon interactions of the model tire derived from a set of Lagrangians by using a unitary transformation method. One or two excited nucleon states in each of S, P, D, and F partial waves are included to generate the resonant amplitudes. Data of the pi(-)p ->eta n. iln reaction from threshold up to a total center-of-mass energy of about 2 GeV are satisfactorily reproduced and the roles played by the following nine nucleon resonances are investigated: S-11(1535), S-11(1650), P-11(1440), P-11(1710), P-13(1720), D-13(1520), D-13(1700), D-15(1675), and F-15(1680). The reaction mechanism and the predicted eta N scattering length are discussed.