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Measurement of \({\rm f(c \to D^{*+} X)}\), \({\rm f(b \to D^{*+} X)}\) and \(\Gamma_{\rm c\bar c}/\Gamma_{\rm had}\) using \({\rm D}^{*\pm}\) mesons

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The production rates of \({\rm D}^{*\pm}\) mesons in charm and bottom events at centre-of-mass energies of about 91 GeV and the partial width of primary \({\rm c\bar c}\) pairs in hadronic \({\rm Z}^0\) decays have been measured at LEP using almost 4.4 million hadronic \({\rm Z}^0\) decays collected with the OPAL detector between 1990 and 1995. Using a combination of several charm quark tagging methods based on fully and partially reconstructed \({\rm D}^{*\pm}\) mesons, and a bottom tag based on identified muons and electrons, the hadronisation fractions of charm and bottom quarks into \({\rm D}^{*\pm}\) mesons have been found to be \[ {\rm f(b \to D^{*+}}X) = 0.173 \pm 0.016 \pm 0.012\quad {\rm and }\quad {\rm f (c \to D^{*+}}X) = 0.222 \pm 0.014 \pm 0.014\; . \] The fraction of \({\rm c\bar c}\) events in hadronic \({\rm Z}^0\) decays, \(\Gamma_{\rm c\bar c}/\Gamma_{\rm had}=\Gamma({\rm Z}^0\to{\rm c\bar c}) / \Gamma({\rm Z}^0\to\rm hadrons)\), is determined to be \[ \Gamma_{\rm c\bar c}/\Gamma_{\rm had} = 0.180\pm 0.011 \pm 0.012 \pm 0.006 \ . \] In all cases the first error is statistical, and the second one systematic. The last error quoted for \(\Gamma_{\rm c\bar c}/\Gamma_{\rm had}\) is due to external branching ratios.

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Received: 18 July 1997

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The OPAL Collaboration., Ackerstaff et al., K. Measurement of \({\rm f(c \to D^{*+} X)}\), \({\rm f(b \to D^{*+} X)}\) and \(\Gamma_{\rm c\bar c}/\Gamma_{\rm had}\) using \({\rm D}^{*\pm}\) mesons. Eur. Phys. J. C 1, 439–459 (1998).

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