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The Minimal Supersymmetric Standard Model opens the possibility ofelectroweak baryogenesis provided that the light scalar top quark (stop) islighter than the top quark. In addition, the lightest neutralino is an idealcandidate to explain the existence of dark matter. For a light stop with massclose to the lightest neutralino, the stop-neutralino co-annihilation mechanismbecomes efficient, thus rendering the predicted dark matter density compatiblewith observations. Such a stop may however remain elusive at hadron colliders.Here it is shown that a future linear collider provides a unique opportunity todetect and study the light stop. The production of stops with smallstop-neutralino mass differences is studied in a detailed experimental analysiswith a realistic detector simulation including a CCD vertex detector for flavortagging. Furthermore, the linear collider, by precision measurements ofsuperpartner masses and mixing angles, also allows to determine the dark matterrelic density with an accuracy comparable to recent astrophysical observations

Analyzing the scalar top coannihilation region at the International Linear Collider