Simple predictive model for flavor production in hadronization

We have found a simple powerful Ansatz, interpreting the Lund symmetric-fragmentation function as a universal production density, which predicts multiplicities and momentum and $P_T^2$ distributions of the many meson and baryon flavors observed in $e^{+}$ $e^{\mathrm{-}}$ collisions at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}\mathrm{\simeq }30}$ GeV almost perfectly with only two ‘‘natural’’ parameters of the Lund symmetric-fragmentation function. The model depends only on hadron masses and not on quark-level suppression factors such as s/u or qq/q. At a minimum, it provides an easy basis for the prediction of particle production rates and distributions, and may provide insight into the actual production mechanism.