Fragmentation of quark and gluon jets in proton-antiproton collisions at center-of-mass energy of 1.8-TeV

Abstract

The author reports the first model independent measurement of charged particle multiplicities in quark and gluon jets, Nq and Ng, produced at the Tevatron in p$\bar{p}$ collisions with center-of-mass energy 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies 41 and 53 GeV by counting charged particle tracks in cones with opening angle of θc = 0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q = Ejetθc varies in the range from 12 GeV to 25 GeV. At Q = 19.2 GeV, the ratio of multiplicities r = Ng/Nq is found to be 1.64 ± 0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with re-summed perturbative QCD calculations and are consistent with recent e+e- measurements.

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