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Research at the ZEUS detector


ZEUS was one of two colliding-beam detectors at the particle accelerator HERA at the Deutschen Elektronen Synchrotron, DESY, in Hamburg. It was the only ep collider in the world and was built in the 1980s. Positrons or electrons and protons were collided between 1992 and 2007. After 8 years of successful data taking the accelerator as well as the detectors underwent a major upgrade. HERA achieved a factor of 4 higher luminosity and additional lepton beam spin rotators in the neighborhood of the two general purpose detectors enabled physics studies with longitudinally polarised beams. The ZEUS detector was also extended at this time by several additional components: Micro-Vertex-Detector MVD, Straw-Tube-Tracker STT, a spectrometer for small-angle scattering (6m-Tagger), and a new luminosity detector. During the last three months of data taking in 2007 the proton beam energy was varied in order to measure of the longitudinal structure function FL of the proton.

The general task of the ZEUS collaboration was to investigate the interactions between electrons/positrons as probes on the one hand and the constituents of the proton (quarks and gluons) on the other. The aim of the ZEUS research program was to increase the current knowledge about basic mechanisms of the strong and electroweak interactions in the Standard Model as well as to discover new phenomena beyond the Standard Model.

The group in Bonn was involved in several detector components both from first and second development phases. Additionally we analysed ZEUS data and investigated several problems of particle physics. You can find more details about the detector on the ZEUS web page .

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