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A study of charm and anti-charm production in beauty decays with the OPAL detector at LEP

Authors:	The OPAL Collaboration

Abstract:	The branching ratio of beauty hadrons to final states containing two charm hadrons, Br(b $\to \mathrm{D\bar{D}X}$ , has been measured using an inclusive method in hadronic Z⁰ decays with the OPAL detector at LEP. The impact parameter significance of tracks opposite tagged b-jets is used to differentiate b $\to \mathrm{D\bar{D}X}$ decays from other decays. The result is $\mathrm{Br(b} \to \mathrm{D\bar{D}X}) = (10.0 \pm 3.2 (\mathrm{stat.})^{+2.4}_{-2.9}(\mathrm{det.})^{+10.4}_{-9.0} (\mathrm{phys.}))\%,$ where det. is the systematic uncertainty due to the modelling of the detector, and ${\rm phys.}$ is the systematic uncertainty due to the modelling of the underlying physics. Using this result, the average number of charm plus anti-charm quarks produced in a beauty quark decay, n_c, is found to be 1.12^{+ 0.11}_-0.10.Received: 11 July 2003, Published online: 18 May 2004

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