Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-05-05
JHEP 9809:015,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 15 figures. Submitted to JHEP. Replaced with extensively rewritten version
Scientific paper
10.1088/1126-6708/1998/09/015
We discuss some important issues concerning multiplicities in quark and gluon jets in e+e- annihilation. In QCD the properties of a jet in general depend on two scales, the energy and virtuality of the jet. Frequently theoretical predictions apply to a situation where these scales coincide, while for experimental data they are often different. Thus an analysis to extract e.g. the asymptotic multiplicity ratio CF/CA between quark and gluon jets, needs a carefully specified jet definition, together with a calculation of nonleading corrections to the multiplicity evolution. We propose methods to systematically study the separate dependence upon the two scales in experimental data and compare the results with theory. We present jet finding algorithms which corresponds well to the theoretically considered jets. We also show that recoil effects add corrections to the modified leading log approximation which are quantitatively important, though formally suppressed at high energies.
Eden Patrik
Gustafson Gösta
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