Low energy πN partial wave analysis

An energy-independent partial-wave analysis has been performed on pion-nucleon elastic and charge-exchange differential cross sections and elastic polarizations, for lab. momenta below 500 MeV/c. The amplitudes were constrained by a simultaneous fixed momentum transfer analysis, which leads to a unique and smooth solution. The masses and widths of Δ++ and Δ0 have been redetermined from total cross sections as msub(Δ++) = 1230.9 +- 0.3 MeV, msub(Δ0) = 1233.6 +- 0.5 MeV, GAMMAsub(Δ++) = 111 +- 1 MeV and GAMMAsub(Δ0) = 113 +- 1.5 MeV. For the pion-nucleon coupling constant the value f2 = 0.079 +- 0.001 was obtained. (orig.)