Abstract
In this paper, the most recent results on jet fragmentation obtained at the Collider Detector at Fermilab Tevatron are presented. The multiplicity and momentum distribution of charged particles inside jets in dijet events are compared to the predictions of the Modified Leading Log Approximation complemented with the hypothesis of Local Parton-Hadron Duality. Values for the two parameters of the model are extracted, the cut-off scale Q{sub eff} = 230 {+-} 40 MeV and the rate of parton-to-hadron conversions K{sub LPHD}{sup charged} = 0.56 {+-} 0.10. A fit of the data for the ratio of multiplicities in gluon and quark jets r, where r is treated as a free parameter, results in r = 1.9 {+-} 0.5. Also, we compare the charged particle multiplicities in dijet and {gamma}-jet events. The comparison allows for an extraction of a model-independent ratio of multiplicities in gluon and quark jets. We report r = N{sub g}/N{sub q} = 1.61 {+-} 0.11(stat) {+-} 0.28(syst) for E{sub jet} = 40 GeV.
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