Charged-Particle Multiplicity<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mrow><mml:mi mathvariant="italic">s</mml:mi></mml:mrow></mml:msqrt><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>1.8</mml:mn><mml:mn/><mml:mi/><mml:mi>TeV</mml:mi></mml:math>

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 $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ 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, $r\ensuremath{\equiv}{N}_{\mathrm{partons}}^{g\ensuremath{-}\mathrm{jet}}{/N}_{\mathrm{partons}}^{q\ensuremath{-}\mathrm{jet}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.7\ifmmode\pm\else\textpm\fi{}0.3$, and the ratio of the number of charged hadrons to the number of partons in a jet, ${K}_{\mathrm{LPHD}}^{\mathrm{charged}}\ensuremath{\equiv}{N}_{\mathrm{hadrons}}^{\mathrm{charged}}{/N}_{\mathrm{partons}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.57\ifmmode\pm\else\textpm\fi{}0.11$.

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