The production of K-S(0) mesons and Lambda baryons in quark and gluon jets
has been investigated using two complementary techniques. In the first appr
oach, which provides high statistical accuracy, jets were selected using di
fferent jet finding algorithms and ordered according to their energy. Produ
ction rates were determined taking into account the dependences of quark an
d gluon compositions as a function of jet energy as predicted by Monte Carl
o models. Selecting three-jet events with the k(perpendicular to) (Durham)
jet finder (Y-cut = 0.005), the ratios of K-S(0) and Lambda production rate
s in gluon and quark jets relative to the mean charged particle multiplicit
y were found to be 1.10 +/- 0.02 +/- 0.02 and 1.41 +/- 0.04 +/- 0.04, respe
ctively, where the first uncertainty is statistical and the second is syste
matic. In the second approach, a new method of identifying quark jets based
on the collimation of energy flow around the jet axis is introduced and wa
s used to anti-tag gluon jets in symmetric (Y-shaped) three-jet events. Usi
ng the cone jet finding algorithm with a cone size of 30 degrees, the ratio
s of relative production rates in gluon and quark jets were determined to b
e 0.94 +/- 0.07 +/- 0.07 for K-S(0) and 1.18 +/- 0.10 +/- 0.17 for Lambda.
The results of both analyses are compared to the predictions of Monte Carlo
models.