Measurement of the probability of gluon splitting into charmed quarks in hadronic $Z$ decays

We have measured the probability, n g→c c ̄ , of a gluon splitting into a charm-quark pair using 1.7 million hadronic Z decays collected by the L3 detector. Two independent methods have been applied to events with a three-jet topology. One method relies on tagging charmed hadrons by identifying a lepton in the lowest energy jet. The other method uses a neural network based on global event shape parameters. Combining both methods, we measure n g→c c ̄ =[2.45±0.29±0.53]% .

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
final state: (3jet)
gluon: fragmentation
quark: charm
quark: pair production
event shape analysis
neural network

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Measurement of the probability of gluon splitting into charmed quarks in hadronic ZZZ decays

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Measurement of the probability of gluon splitting into charmed quarks in hadronic $Z$ decays