Production of K0S and Λ in quark and gluon jets from Z0 decay

Kartvelishvili, Vakhtang (1999) Production of K0S and Λ in quark and gluon jets from Z0 decay. European Physical Journal C: Particles and Fields, 8 (2). pp. 241-254. ISSN 1434-6044

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Abstract

The production of K0SKS0 mesons and ΛΛ 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 k⊥k⊥ (Durham) jet finder ( ycut=0.005ycut=0.005 ), the ratios of K0SKS0 and ΛΛ production rates in gluon and quark jets relative to the mean charged particle multiplicity were found to be 1.10±0.02±0.021.10±0.02±0.02 and 1.41±0.04±0.041.41±0.04±0.04 , 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 0.94±0.07±0.070.94±0.07±0.07 for K0SKS0 and 1.18±0.10±0.171.18±0.10±0.17 for ΛΛ . The results of both analyses are compared to the predictions of Monte Carlo models.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 82589
Deposited By: ep_importer_pure
Deposited On: 02 Nov 2016 16:28
Refereed?: Yes
Published?: Published
Last Modified: 29 Jan 2020 03:33
URI: https://eprints.lancs.ac.uk/id/eprint/82589

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