DOI 10.1007/s100529901058
Production of
and
in quark and gluon jets from
decay
The OPAL Collaboration
K.Ackerstaff 8 - et al.
8CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 30 July 1998 / Published online: 11 March 1999
Abstract
The production of mesons and
baryons in quark and gluon
jets has been investigated using two complementary techniques. In
the first approach, which provides high statistical accuracy, jets
were selected using different jet finding algorithms and ordered
according to their energy. Production rates were determined taking
into account the dependences of quark and gluon compositions as a
function of jet energy as predicted by Monte Carlo models.
Selecting three-jet events with the
(Durham) jet finder (
), the ratios of
and
production rates in gluon and
quark jets relative to the mean charged particle multiplicity were
found to be
and
, respectively, where the first uncertainty is statistical and the
second is systematic. 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 was used to anti-tag gluon
jets in symmetric (Y-shaped) three-jet events.
Using the cone jet finding algorithm with a cone
size of 30
, the ratios of relative production rates in gluon
and quark jets were determined to be
for
and
for
. The results of both
analyses are compared to the predictions of Monte Carlo models.
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