The experiment investigates properties of electron/positron collisions with protons on the HERA collider at DESY Hamburg at the centre of mass energy 920 GeV. Parton distribution functions of proton, discovery of hard diffraction in ep collisions, investigation of virtual photon structure, jet physics and neutral current properties, are the main topics of the experiment. Since HERA was stopped in the middle of 2007, the data analysis and publishing of physical results are the main activities of the experiment now.
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