2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201139Using an inclusive method, BR(b -> D\bar{D}X) has been measured in hadronic Z^0 decays with the OPAL detector at LEP. The impact parameter significance of tracks opposite tagged b-jets is used to differentiate b -> D\bar{D}X decays from other decays. Using this result, the average number of charm and anti-charm quarks produced per beauty quark decay, n_c, is determined.20 pages, 4 figuresHigh Energy Physics - Experimenttext