Isospin quantum distances in hadron-hadron scattering

In this paper, the quantum distances between two isospin channels, in the Hilbert space of the hadron-hadron scattering amplitudes, are introduced. These isospin quantum distances, as well as their isospin bounds, are expressed in terms of the channel cross sections and polarisation parameters. The essential features as well as the energy behavior of the isospin quantum distances, for the pion-nucleon scattering, are presented for all (s, t, u)-channels.