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A Measurement of the QCD color factors and a limit on the light gluino

Barate, R. and Finch, Alexander (1997) A Measurement of the QCD color factors and a limit on the light gluino. Zeitschrift für Physik C Particles and Fields, 76 (1). pp. 1-14. ISSN 0170-9739

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Abstract

Using data collected from 1992 to 1995 with the ALEPH detector at LEP, a measurement of the colour factor ratios C-A/C-F and T-F/C-F and the strong coupling constant <(alpha)over bar (s)> = C-F alpha(s), (M-Z)/(2 pi) has been performed by fitting theoretical predictions simultaneously to the measured differential two-jet rate and angular distributions in four-jet events. The result is found to be in excellent agreement with QCD.C-A/C-F = 2.20 +/- 0.09 (stat) +/- 0.13 (syst),T-F/C-F = 0.29 +/- 0.05 (stat) +/- 0.06 (syst).Fixing C-A/C-F and T-F/C-F to the QCD values permits a determination of alpha(s) (M-Z) and n(f), the number of active flavours. With this measurement the existence of a gluino with mass below 6.3 GeV/c(2) is excluded at 95% confidence level.

Item Type: Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64025
Deposited By: ep_importer_pure
Deposited On: 14 May 2013 15:23
Refereed?: Yes
Published?: Published
Last Modified: 19 Nov 2017 12:16
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64025

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