Relative production of vector and pseudoscalar states for light- and heavy-flavour mesons

The relative fractions of vector, V, and pseudoscalar, P, primary mesons produced in Z0→bb̄ and Z0→cc̄ decays, and primary light-flavour mesons produced in fragmentation processes are explained by the hyperfine mass splitting. The difference in corresponding fractions arises from the difference in the constituent quark masses m̂=mu=md, ms, mc and mb:ρ3π=K∗3Kmsm̂=D∗3Dmcm̂=D∗s3Dsmsmcm̂2=B∗3Bmbm̂=B∗s3Bsmsmbm̂2.The production ratios for strange, charm and beauty mesons evaluated from the ρ/(3π) ratio, measured at LEP for primary produced ρ and π, agree with the results of LEP and lower energy e+e− experiments.