Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-03-17
Rev.Mod.Phys. 71 (1999) 1275-1410
Physics
High Energy Physics
High Energy Physics - Experiment
351 pages, 154 figures, submitted to Reviews of Modern Physics
Scientific paper
10.1103/RevModPhys.71.1275
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.
Abramowicz Halina
Caldwell Allen
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