pi+-, K+-, p and p-bar production in Z0 -> q q-bar, Z0 -> b b-bar, Z0 -> u u-bar, d d-bar, s s-bar

The DELPHI experiment at LEP uses Ring Imaging Cherenkov detectors for particle identification. The good understanding of the RICH detectors allows the identification of charged pions, kaons and protons, covering the full momentum range from 0.7 < p < 45.6GeV/c. The π±, K±, p and pÌ„ normalised production rates, their differential cross sections, multiplicities and the maxima Î3⁄4*pof_the Î3⁄4p= ln (1/Xp) distributions are measured for three event samples Z0→ qqÌ„, Z0→ bbÌ„, Z0→ uÅ«, ddÌ„, ssÌ„, selected from âˆ1⁄4 1 400 000 Z0decays collected by DELPHI in 1994. The results are compared to the predictions of the JETSET string fragmentation model and the HERWIG cluster fragmentation model. The Modified Leading Logarithm Approximation with Local Parton-Hadron Duality is tested. The Î3⁄4*pdependence on the primary quark flavour is investigated and quantified for the different particle distributions. The π±, K±, p and pÌ„ multiplicities are measured with precisions from ±4% to ±6%. Forche Z0→ qqÌ„, and Z0→ bbÌ„, event samples, these improve on previous measurements. The π±, K±, p and pÌ„ multiplicities for Z0→ uÅ«, ddÌ„, ssÌ„ are presented for the first time.