Measurements of partial widths and forward–backward asymmetries in Z0 decays into ss̄, cc̄ and bb̄-preliminary results

Measurements are reported of partial widths and forward–backward asymmetries in flavour-identified quark final states based on the full LEP1 statistics, corresponding to 3×106 hadronic Z0 decays collected by the DELPHI experiment from 1992 to 1995. Particle identification provided by the Ring Imaging Cherenkov counters and the Time Projection Chamber is used to obtain clear D0, D+, Ds+ and Λc+ signatures. A measurement of the charm multiplicity in bb̄ events is also presented. Identification of high-energy charged kaons is used to tag the s quark. Two methods for determination of the forward-backward asymmetry of the s quark are presented.