Charged-Particle Multiplicity $\mathit{p}\overline{p}$ Collisions at $\sqrt{\mathit{s}}=1.8\mathrm{}\mathrm{TeV}$

We report on a measurement of the mean charged-particle multiplicity of jets in dijet events with dijet masses in the range $80–630\mathrm{GeV}/c^2$, produced at the Tevatron in $p\overline{p}$ collisions with $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ 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, $r\equiv N_{\mathrm{partons}}^{g-\mathrm{jet}}{/N}_{\mathrm{partons}}^{q-\mathrm{jet}}=1.7\mathrm{}\pm 0.3$, and the ratio of the number of charged hadrons to the number of partons in a jet, $K_{\mathrm{LPHD}}^{\mathrm{charged}}\equiv N_{\mathrm{hadrons}}^{\mathrm{charged}}{/N}_{\mathrm{partons}}=0.57\mathrm{}\pm 0.11$.