The Hadronic Final State at HERA

Understand

The hadronic final state in electron-proton collisions at HERA has provided a rich testing ground for development of the theory of the strong force, QCD.

• In this review, over 200 publications from the H1 and ZEUS Collaborations are summarised.
• Short distance physics, the measurement of processes at high energy scales, has provided rigorous tests of perturbative QCD and constrained the structure of the proton as well as allowing precise measurements of the strong coupling constant to be made.
• Non-perturbative or low energy processes have also been investigated and results on hadronisation interpreted together with those from other experiments.