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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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QCD Analyses

QCD Analyses

Chapter:
(p.228) 6 QCD Analyses
Source:
Quantum Chromodynamics
Author(s):

GÜNTHER DISSERTORI

IAN G. KNOWLES

MICHAEL SCHMELLING

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199566419.003.0006

While perturbative QCD deals with free quarks and gluons, experimentally, usually only multi-hadron final states are observed. This chapter focuses on how to extract information about QCD from the observable final states. After explaining the general phenomenology, it discusses the problem of selecting events of a certain class from the set of all the interactions recorded by an experiment. It then defines appropriate observables which are sensitive to the dynamics of QCD. Given such variables, the issues of corrections for detector effects —such as finite acceptance, efficiency and resolution, hadronization corrections, which go back from the observable hadron level to the theoretically accessible parton level, and systematic uncertainties — are addressed. The analysis strategies are illustrated by the examples of structure function measurements from deep inelastic scattering, jet cross sections in proton-antiproton collisions, and the determination of jet rates in electron-positron annihilation.

Keywords:   event selection, QCD observables, inclusive measurements, jet algorithm, detector corrections, hadronization corrections, systematic uncertainties, structure function measurements, jet cross sections

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