The branching ratio of beauty hadrons to final states containing two charm hadrons, Br(b → DD̄X), 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 → DD̄X decays from other decays. The result is Br(b → DD̄X) = (10.0 ± 3.2(stat.)-2.9+ 2.4(det.)-9.0+10.4(phys.))%, where "det." is the systematic uncertainty due to the modelling of the detector, and "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, nc, is found to be 1.12-0.10+0.11.
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)