*Robin Devenish and Amanda Cooper-Sarkar*

- Published in print:
- 2003
- Published Online:
- January 2010
- ISBN:
- 9780198506713
- eISBN:
- 9780191709562
- Item type:
- book

- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198506713.001.0001
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology

The book provides a self-contained account of deep inelastic scattering (DIS) in high energy physics. It covers the classic results that lead to the quark-parton model of hadrons and the ...
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The book provides a self-contained account of deep inelastic scattering (DIS) in high energy physics. It covers the classic results that lead to the quark-parton model of hadrons and the establishment of quantum chromodynamics (QCD), through to the new vistas in the subject opened up by the electron-proton collider HERA. The extraction of parton momentum distribution functions, a key input for physics at hadron colliders such as the Tevatron and Large Hadron Collider (LHC), is described in detail. The challenges of the HERA data at low-x are described, and possible explanations in terms of gluon dynamics outlined. Other chapters cover: jet production at large momentum transfer and the determination of the strong coupling constant; electroweak probes at very high momentum transfers; the extension of deep inelastic techniques to include hadronic probes; a summary of fully polarised inelastic scattering and the spin structure of the nucleon; and a brief account of methods for searching for signals ‘beyond the standard model’.Less

The book provides a self-contained account of deep inelastic scattering (DIS) in high energy physics. It covers the classic results that lead to the quark-parton model of hadrons and the establishment of quantum chromodynamics (QCD), through to the new vistas in the subject opened up by the electron-proton collider HERA. The extraction of parton momentum distribution functions, a key input for physics at hadron colliders such as the Tevatron and Large Hadron Collider (LHC), is described in detail. The challenges of the HERA data at low-x are described, and possible explanations in terms of gluon dynamics outlined. Other chapters cover: jet production at large momentum transfer and the determination of the strong coupling constant; electroweak probes at very high momentum transfers; the extension of deep inelastic techniques to include hadronic probes; a summary of fully polarised inelastic scattering and the spin structure of the nucleon; and a brief account of methods for searching for signals ‘beyond the standard model’.

*Robin Devenish and Amand Cooper-Sarkar*

- Published in print:
- 2003
- Published Online:
- January 2010
- ISBN:
- 9780198506713
- eISBN:
- 9780191709562
- Item type:
- chapter

- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198506713.003.0009
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology

This chapter is concerned with physics at low values of Bjorken x, below 0.01, where the q-qbar sea and gluon are the dominant partons and increasing rapidly as x decreases. It starts with an ...
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This chapter is concerned with physics at low values of Bjorken x, below 0.01, where the q-qbar sea and gluon are the dominant partons and increasing rapidly as x decreases. It starts with an overview of the approaches considered and their regions of validity in the ln(1/x)-ln(Q2 ) plane. Then follows an account of the ‘standard’ approaches: DGLAP equations at low x and the Regge approach to total cross-sections. The hard and soft Pomerons are introduced and explained, followed by the BFKL equation. Angular ordering of gluon radiation and the CCFM approach to DIS comes next. These aforementioned approaches are linear and lead to an undamped increasing structure function as x decreases, which will violate unitarity eventually. This problem and how non-linear effects ameliorate it are covered next. The last section gives a comparison of the low-x approaches with structure-function data and outlines the need for precision measurements of other observables.Less

This chapter is concerned with physics at low values of Bjorken *x*, below 0.01, where the q-qbar sea and gluon are the dominant partons and increasing rapidly as x decreases. It starts with an overview of the approaches considered and their regions of validity in the ln(1/x)-ln(Q^{2} ) plane. Then follows an account of the ‘standard’ approaches: DGLAP equations at low *x* and the Regge approach to total cross-sections. The hard and soft Pomerons are introduced and explained, followed by the BFKL equation. Angular ordering of gluon radiation and the CCFM approach to DIS comes next. These aforementioned approaches are linear and lead to an undamped increasing structure function as *x* decreases, which will violate unitarity eventually. This problem and how non-linear effects ameliorate it are covered next. The last section gives a comparison of the low-*x* approaches with structure-function data and outlines the need for precision measurements of other observables.