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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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Differences Between Quark And Gluon Jets

Differences Between Quark And Gluon Jets

(p.376) 12 Differences Between Quark And Gluon Jets
Quantum Chromodynamics




Oxford University Press

Due to the different colour charge of quarks and gluons, differences in the fragmentation of the two types of partons are expected. The final state particle multiplicities thus should contain information about the type of the primary particle which initiated the jet. This chapter begins by reviewing theoretical expectations and then discusses experimental results for total multiplicities, particle content, and the momentum flow as characterized by the momentum spectrum and the jet profile. The studies show that the gluon indeed has a larger colour charge than the quark, and allows the determination of relevant energy scales, which govern the evolution of the gluon jet.

Keywords:   quark-jet, gluon-jet, particle multiplicities, topology dependence, jet profiles, fragmentation functions

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