Research Papers in Physics and Astronomy


Date of this Version



Published by American Physical Society. Phys. Rev. Lett. 87, 211804 (2001). Copyright © 2001 American Physical Society. Permission to use.


We report on a measurement of the mean charged-particle multiplicity of jets in dijet events with dijet masses in the range 80-630 GeV/c2, produced at the Tevatron in pp̅ collisions with √s= 1.8 TeV and recorded by the Collider Detector at Fermilab. The data are fit to perturbative-QCD calculations carried out in the framework of the modified leading log approximation and the hypothesis of local parton-hadron duality. The fit yields values for two parameters in that framework: the ratio of parton multiplicities in gluon and quark jets, r=Ng-jet partons/Nq-jet partons =1.7 ± 0.3, and the ratio of the number of charged hadrons to the number of partons in a jet, Kcharged LPHDNcharged hadrons /Npartons =0.57 ± 0.11.

Included in

Physics Commons