Recoil detection at future QCD facilities

Fixed target experiments at future deep-inelastic scattering facilities, such as the proposed TESLA-N and EVELIN projects, require the detection of particles at larger angles than will be covered by the forward-angle spectrometers, typically foreseen in such high-luminosity experiments. The large-angle particles mostly correspond to recoil protons that can be used to identify exclusive processes, which currently are of high interest as they give access to the Generalized Parton Distributions. For this purpose a large-angle detector needs to be developed. The resolution and particle identification capability that can be achieved with a small detector consisting of a few silicon layers has been investigated. The detector is assumed to perform multiple sampling of the ionization tracks caused by high momentum (<2 GeV c−1) pions, kaons, and protons in the silicon. Realistic models for the noise of the read-out electronics and segmentation of the detectors are used. The result of the study which is based on Monte Carlo simulations and—partly—calibrated by data, is a conceptual detector design with π, p, K separation up to 1.3 GeV c−1.