Abstract :
Mass (M) dependences of the total production rates per hadronic Z decay of all light-flavour hadrons measured so far at LEP were extrapolated to the point M=0 using the phenomenological laws of hadron production related to the spin, isospin, strangeness and mass of the particles. The vector-to-pseudoscalar and meson-to-baryon ratios at M=0 were found to be: ρ+/ 3 π+=1.2 ± 0.3 and π+/ p=2.8 ± 0.3. They agree with predictions of the quark combinatorics model.
