Measurements of partial widths and forward-backward asymmetries in $Z^{0}$ decays into ss, cc and bb: 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*10/sup 6/ hadronic Z/sup 0/ 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 D/sup 0/, D/sup + /, D/sub s//sup +/ and Lambda /sub c//sup +/ signatures. A measurement of the charm multiplicity in bb 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. (14 refs)