Abstract
Results on the measurements of the hadronic final state in e^+- p collisions by the H1 and ZEUS experiments at HERA are presented. These are measurements on the production of prompt photons in photoproduction, inclusive jet, dijet and trijet production in deep-inelatic scattering and on the search for QCD instantons. The jet production data is employed for the extraction of the strong coupling constant alpha_s(M_Z).
Highlights
The HERA collider was an e± p collider with centre-of-mass energy of 319 GeV with two multipurpose experiments, H1 and ZEUS
The production of isolated photons in an hadronic environment, so-called prompt photons, is an important process to test the understanding of underlying QCD processes since prompt photons are unaffected by hadronisation and are a direct probe of the partonic hard process
Nonprompt photons, i.e. photons originating from decays of secondary particles such as π0, are described using fragmentation functions
Summary
The HERA collider was an e± p collider with centre-of-mass energy of 319 GeV with two multipurpose experiments, H1 and ZEUS. Both experiments recorded in the years 1992–2007 data with an integrated luminosity of about 0.5 pb−1. Several years after data taking, both experiments have successively refined their analysis techniques and have achieved the final precision of their data with, for instance, a precision of the jet energy scale of 1 %. In the current era of hadron-hadron colliders, the HERA experiments provide important precision measurements of QCD, due to their unique initial state with only one hadron involved
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