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HERA was a high-energy electron/positron proton collider with a centre of mass energy of up to 320 GeV operated until summer 2007. The hadronic final state in the regime of deep-inelastic scattering as well as of photoproduction has been thoroughly investigated over a wide range of phase space with the two multi-purpose detectors H1 and ZEUS. The large available HERA data samples of about 0.5 fb ...
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