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Deep inelastic scattering at HERA: A review of experimental results in the light of quantum chromodynamics by J. Engelen; P. Kooijman is a Physics and Astronomy article available to read on EtoBox.

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New results on deep inelastic lepton-hadron scattering (DIS), obtained by the ZEUS and Hl collaborations at the HERA collider (DESY, Hamburg) significantly expand the knowledge gained in earlier, fixed target experiments. The new kinematic domain accessed by the HERA experiments yielded the following results: -quark and gluon densities rise rapidly for decreasing z (their fractional momentum). This behavior persists down to low values of Q2 (minus the squared four momentum of the field quantum exchanged between lepton and hadron). the scaling violations over the entire kinematic domain (z > 10m5, Q2 > 1 GeV2) are in quantitative agreement with perturbative QCD. -the low x region allows a study of cross sections both from the point of view of QCD (small distance) and of Regge theory (high energy) and may lead to new insights into the transition of the perturbative into the nonperturbative regime. The low x region may also reveal differences between different realizations of perturbative, higher order QCD (DGLAP vs. BFKL) and ultimately even effects of 'high density QCD'. -diffractive DIS, observed at HERA for the 6rst time, allows the study of the diffractive amplitude ('the Pomeron

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Author

J. Engelen; P. Kooijman

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0146-6410)

Published

1998

Language

EN

Field

Physics and Astronomy (Physical Sciences)