Measurement of the quark and gluon fragmentation functions in Z0 hadronic decays
1999
The transverse, longitudinal and asymmetric components of the
fragmentation functionare measured from the inclusive charged particles produced in e+e- collisions at LEP. As in
deep inelastic scattering, these data are important for tests of QCD. The transverse σΤ and longitudinal σL components of the total hadronic cross section σtot are evaluated from the measured
fragmentation functions. They are found to be σΤ/σtot = 0.949 ± 0.001(
stat.) ± 0.007(syst.) and σL/σtot = 0.051 ± 0.001(
stat) ± 0.007(syst.) respectively. The strong coupling constant is calculated from σL/σtot in next-to-leading order of
perturbative QCD, giving αs(Mz) = 0.120 ± 0.002(
stat.) ± 0.013(syst.) ± 0.007(scale) . Including non-perturbative power corrections leads to αs(Mz) = 0.101 ± 0.002(
stat.) ± 0.013(syst.) ± 0.007(scale) . The measured transverse and longitudinal components of the
fragmentation functionare used to estimate the mean charged multiplicity, 〈nch〉 = 21.21 ± 0.01(
stat.) ± 0.20(syst.) The
fragmentation functionsand multiplicities in bb and light quark events are compared. The measured transverse and longitudinal components of the
fragmentation functionallow the gluon
fragmentation functionto be evaluated.
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