Measurements of the Z partial decay
and multiplicity of charm quarks per b decay
The DELPHI Collaboration
P.Abreu 21 - et al.
21 LIP, IST, FCUL - Av. Elias Garcia, 14-1o,
1000 Lisboa Codex, Portugal
Received: 1 June 1999 / Published online: 8 December 1999
The partial decay width Rc of the Z into quark pair and the number of charm quarks nc per b decay are measured with the DELPHI detector at LEP 1. Particle identification provides clear D0, D+, Ds+ and signatures. The charm hadron production rate is measured in each channel by a fit to the scaled energy, impact parameter information and the invariant mass spectrum. Two measurements of Rc are presented, from the D*+ production rate and from the overall charm counting, including strange charm baryon production, in events. The multiplicity nc, which includes hidden and strange charm baryon production, is inferred from the charm counting in events.
The final results are and .
Copyright Springer-Verlag 2000