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

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 \mbox{LEP 1}. Particle identification provides clear $D^0$, $D^+$, $D_s^+$ 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 $n_c = 1.166 \pm 0.086$.
Document type :
Journal articles

Cited literature [8 references]

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Submitted on : Friday, February 11, 2000 - 10:59:55 AM
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• HAL Id : in2p3-00003676, version 1

Citation

P. Abreu, W. Adam, T. Adye, P. Adzic, I. Azhinenko, et al.. Measurements of the Z partial decay width into $c\overline{c}$ and multiplicity of charm quarks per b decay. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 12, pp.225-241. ⟨in2p3-00003676⟩

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