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Deep Inelastic Scattering$
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Robin Devenish and Amanda Cooper-Sarkar

Print publication date: 2003

Print ISBN-13: 9780198506713

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198506713.001.0001

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αs from scaling violations and jets at high Q2

αs from scaling violations and jets at high Q2

Chapter:
(p.181) 7 αs from scaling violations and jets at high Q2
Source:
Deep Inelastic Scattering
Author(s):

Robin Devenish

Amanda Cooper-Sarkar

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198506713.003.0007

The advantages and disadvantages of various methods of determining the strong coupling αs from DIS data are considered including the use of moments of the measured structure functions and the conventional method in which αs is determined in an NLO QCD fit along with the parton momentum densities. The estimation of experimental and theoretical uncertainties is discussed in detail. Various possible extensions to the theoretical framework are summarised. The remaining sections consider jet production at HERA. The importance of using the Breit frame is covered and a brief outline given of the QCD calculation of the dijet cross-section. Jet measures, including the cone and k_T algorithms, which provide the link between the final state hadrons and the underlying partonic structure, are outlined. It is shown that NLO QCD gives a good description of dijet data. Then measurement of αs and the running of αs from jet production rates at large Q2 are discussed.

Keywords:   scaling violations, DIS data, measured structure functions, Breit frame, jet measures

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