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Study of the subjet structure of quark and gluon jets

Buskulic, D. and Finch, Alexander (1995) Study of the subjet structure of quark and gluon jets. Physics Letters B, 346 (3-4). pp. 389-398. ISSN 0370-2693

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Abstract

Measurements of the subjet structure of quark and gluon jets in hadronic Z decays are presented. The analysis is based on one million hadronic events recorded by the Aleph detector. Roughly symmetric three-jet events are selected with a coarse jet-resolution cut-off, y1. Gluon jets are identified with a purity of 94.6% in those events where evidence of long-lived heavy-flavour hadrons in the other two jets is found. The jets are then analyzed using a smaller cut-off y0 (< y1) so that subjets are resolved. The properties of the jets (subjet multiplicities (Nq), (Ng) and rates Rng(q) for n = 1, 2, 3, 4) are determined and are found to be in good agreement with the expectations of perturbative QCD as long as the subjet resolution parameter y0 is sufficiently large to keep non-perturbative effects small. In particular, the ratio , which to leading order in QCD is given by the ratio of colour factors , is measured to be 1.96 ± 0.15 for y0 = 2 · 10−3, but falls to 1.29 ± 0.03 for y0 = 1.6 · 10−5.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64082
Deposited By: ep_importer_pure
Deposited On: 09 May 2013 15:20
Refereed?: Yes
Published?: Published
Last Modified: 06 Sep 2017 02:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64082

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