THE STUDY OF THE B_s MESON AT DELPHI

摘要

In the Z~0 hadronic decays a sizeable fraction of B_s meson is produced. Various methods used in the study of B_s meson properties are described, including the D_s-lepton correlation, the study of inclusive D_s production and the exclusive reconstruction of B_s decays. The results presented are the first evidences of B_s production based on 1991 data, the measurement of the B_s mass, m (B_s) = 5374 ±16 ± 2 MeV, and the B_s lifetime, τ(B_s)=1.11 ± 0.27 ± 0.17ps.