Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-10-13
Eur.Phys.J.C18:447-460,2001
Physics
High Energy Physics
High Energy Physics - Experiment
22 pages, 9 figures, submitted to Eur. Phys. J. C
Scientific paper
10.1007/s100520100580
The rates are measured per hadronic Z decay for gluon splitting to bb(bar) quark pairs, g_bb, and of events containing two bb(bar) quark pairs, g_4b, using a sample of four-jet events selected from data collected with the OPAL detector. Events with an enhanced signal of gluon splitting to bb(bar) quarks are selected if two of the jets are close in phase-space and contain detached secondary vertices. For the event sample containing two bb(bar) quark pairs, three of the four jets are required to have a significantly detached secondary vertex. Information from the event topology is combined in a likelihood fit to extract the values of g_bb and g_4b, namely g_bb = (3.07 +- 0.53(stat) +- 0.97(syst))x10^-3 g_4b = (0.36 +- 0.17(stat) +- 0.27(syst))x10^-3
Abbiendi Giovanni
collaboration The OPAL
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