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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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The quark-parton model

The quark-parton model

Chapter:
(p.14) 2 The quark-parton model
Source:
Deep Inelastic Scattering
Author(s):

Robin Devenish

Amanda Cooper-Sarkar

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198506713.003.0002

This chapter introduces the quark-parton model (QPM). The cross-section expressions for point-like elastic electron-quark and quasi-elastic neutrino-quark scattering are developed. The full cross-section for lepton-nucleon deep inelastic scattering is constructed by folding the point-like elastic cross-sections with parton momentum densities. This then leads to expressions for the electromagnetic and neutrino nucleon structure functions in terms of parton density functions, showing that in the QPM the structure functions are approximately independent of momentum transfer — verifying the prediction of ‘Bjorken scaling’. An outline of other elementary tests of the quark-parton model then follows and the chapter ends with a discussion of sum rules.

Keywords:   QPM, structure functions, Bjorken scaling, sum rules

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