A simultaneous measurement of the strong coupling and the QCD colour charges

Citation
B. Dienes et Z. Trocsanyi, A simultaneous measurement of the strong coupling and the QCD colour charges, NUCL PH B-P, 96, 2001, pp. 40-44
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
ISSN journal
0920-5632 → ACNP
Volume
96
Year of publication
2001
Pages
40 - 44
Database
ISI
SICI code
0920-5632(200104)96:<40:ASMOTS>2.0.ZU;2-9
Abstract
data from e(+)e(-) annihilation into hadrons, taken with the OPAL detector at LEP at the Z(0) pole between 1991 and 1995, we performed a simultaneous measurement of the strong coupling alpha (s) and the colour factors of the underlying gauge group of the strong interaction, C-F and C-A The measureme nt was carried out by fitting next-to-leading order perturbative prediction s to measured angular correlations of 4-jet events together with either a m ulti-jet rate or an event-shape variable. Our combined results provide a te st of perturbative QCD with the assumptions only of non-abelian gauge symme try and standard hadronization models. Our results are in agreement with SU (3) expectations for C-F and C-A and the world average of alpha (s)(M-Z0).