Measurements of the $Z$ partial decay width into $c\bar c$ and multiplicity of charm quarks per $b$ decay

The DELPHI Collaboration:    P. Abreu - et al.

doi:doi:10.1007/s1005299000228

EPJ

Measurements of the Z partial decay
width into $c\bar c$ and multiplicity of charm quarks per b decay

The DELPHI Collaboration

P.Abreu ²¹ - et al.

²¹ LIP, IST, FCUL - Av. Elias Garcia, 14-1^o, 1000 Lisboa Codex, Portugal

Received: 1 June 1999 / Published online: 8 December 1999

Abstract
The partial decay width R_c of the Z into $c\bar c$ quark pair and the number of charm quarks n_c per b decay are measured with the DELPHI detector at LEP 1. Particle identification provides clear D⁰, D⁺, D_s⁺ and $\Lambda_c^+$ 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 R_c are presented, from the D^*+ production rate and from the overall charm counting, including strange charm baryon production, in $c\bar c$ events. The multiplicity n_c, which includes hidden $c\bar c$ and strange charm baryon production, is inferred from the charm counting in $b\bar{b}$ events.
The final results are $R_c = 0.1665 \pm 0.0095$ and $n_c = 1.166 \pm 0.086$ .

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Measurements of the Z partial decay width into and multiplicity of charm quarks per b decay

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Measurements of the Z partial decay
width into $c\bar c$ and multiplicity of charm quarks per b decay