Quark combinatorics for production ratios in hadronic Z^0 decays
  Model independent verification of the quark combinatorics rules, which govern the ratios of the yields of secondaries, is presented for jet processes. Because of a large number of produced resonances in the hadron jets, a test of the quark combinatorics rules is hardly possible in the central region, x_{hadron} < 0.2. However, a model-independent verification is plausible at x_{hadron} \sim 1. It is shown that for the large x_{hadron} kinematical region the quark combinatorial relations are in a reasonable agreement with data for \rho^0/\pi^0 and p/\pi^+ ratios. 
V. A. Nikonov and J. Nyiri