Pion-proton scattering and isospin breaking in the ${\Delta }^0-{\Delta }^{++}$ system

A. Bernicha, G. Lopez Castro, J. Pestieau

We determine the mass and width of the ${\Delta }^{++}({\Delta }^0)$ resonance from data on ${\pi }^{+}p({\pi }^{-}p)$ scattering both, in the pole of the $S$-matrix and conventional Breit-Wigner approach…