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Publication . Article . Preprint . 1999

HERA collider physics

Halina Abramowicz; A. Caldwell;
Open Access
English
Abstract
HERA, the first electron-proton collider, has been delivering luminosity since 1992. It is the natural extension of an impressive series of fixed-target lepton-nucleon scattering experiments. The increase of a factor ten in center-of-mass energy over that available for fixed-target experiments has allowed the discovery of several important results, such as the large number of slow partons in the proton, and the sizeable diffractive cross section at large $Q^2$. Recent data point to a possible deviation from Standard Model expectations at very high $Q^2$, highlighting the physics potential of HERA for new effects. The HERA program is currently in a transition period. The first six years of data taking have primarily elucidated the structure of the proton, allowed detailed QCD studies and had a strong impact on the understanding of QCD dynamics. The coming years will bring the era of electroweak studies and high $Q^2$ measurements. This is therefore an appropriate juncture at which to review HERA results.
Comment: 351 pages, 154 figures, submitted to Reviews of Modern Physics
Subjects by Vocabulary

Dewey Decimal Classification: ddc:530

arXiv: High Energy Physics::Experiment High Energy Physics::Phenomenology

Microsoft Academic Graph classification: Quantum chromodynamics Parton Physics Leptoquark Particle physics Jet (particle physics) HERA Electroweak interaction Nuclear physics Collider law.invention law ZEUS (particle detector)

Subjects

High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, General Physics and Astronomy, High Energy Physics - Experiment

293 references, page 1 of 30

2 Lepton-nucleon scattering 10 2.1 Kinematics of lepton-nucleon scattering . . . . . . . . . . . . . 14 2.2 Structure functions in the Quark Parton Model . . . . . . . . 16 2.3 QCD evolution equations . . . . . . . . . . . . . . . . . . . . . 19 2.4 Structure functions in the γ∗p system . . . . . . . . . . . . . . 22 2.5 Regge phenomenology . . . . . . . . . . . . . . . . . . . . . . 24 2.6 QCD dynamics at small x . . . . . . . . . . . . . . . . . . . . 26 2.7 Perturbative QCD in the final states . . . . . . . . . . . . . . 29 2.8 Space time picture of ep scattering at HERA . . . . . . . . . . 31

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