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Quantum ChromodynamicsHigh Energy Experiments and Theory$
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Günther Dissertori, Ian G. Knowles, and Michael Schmelling

Print publication date: 2009

Print ISBN-13: 9780199566419

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780199566419.001.0001

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Tests Of The Gauge Structure Of QCD: Colour Factors

Tests Of The Gauge Structure Of QCD: Colour Factors

Chapter:
(p.344) 10 Tests Of The Gauge Structure Of QCD: Colour Factors
Source:
Quantum Chromodynamics
Author(s):

GÜNTHER DISSERTORI

IAN G. KNOWLES

MICHAEL SCHMELLING

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199566419.003.0010

This chapter examines the QCD lagrangian, focusing on the gauge group governing the dynamics of strong interactions. Experiments are described which verify that QCD is based on the gauge group SU(3). After explaining how the so-called colour factors allow pinpointing of the gauge symmetry, experimental observables sensitive to the colour factors are introduced and experimental distributions are compared to theoretical predictions. The results show that the dynamics of QCD are consistent with the expected SU(3) symmetry, the correct ratio of the strengths of the quark-gluon to the gluon-gluon coupling, and the number of colour states of the gluon. The results are also interpreted as a limit on the mass of the gluino, the supersymmetric partner of the gluon.

Keywords:   gauge structure, colour factors, three-jet observables, four-jet observables, Körner–Schierholz–Willrodt angle, Bengtsson–Zerwas angle, Nachtmann–Reiter angle, light gluino

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