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

  • experimental physics
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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.

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Received: 11 July 2003, Published online: 18 May 2004

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The OPAL Collaboration. A study of charm and anti-charm production in beauty decays with the OPAL detector at LEP. Eur. Phys. J. C 35, 149–158 (2004). https://doi.org/10.1140/epjc/s2004-01810-9

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