Minimal rule and fragmentation model

The minimal rule for hadron scattering, proposed by Chou and Yang as a basic part of their fragmentation model, is tested for high-energy $\mathrm{pp}$ and ${\pi }^{-}p$ data. We also calculate charge transfer for ${\pi }^{-}p$. In addition, we investigate the behavior of the fragmentation contribution to inclusive distributions in the central region, the rate of increase allowed by the minimal rule for extra energy-dependent contributions there, and factorization within the fragmentation concept.