Tagged DIS measurements of high-momentum bound nucleons

For over 50 years, deep inelastic scattering (DIS) has been used to study the quark structure of hadronic matter. One of the most puzzling discoveries made by DIS is the difference in quark structure between a nucleus and its component nucleons. This difference, called the EMC effect, is attributed to the modification of the internal structure of nucleons bound in nuclei. Forty years after its discovery, there remains no consensus on the origin of the EMC effect. While existing inclusive DIS data have characterized the EMC effect over a wide range of nuclei, they have limited ability to discriminate between different hypotheses of bound nucleon modification. In the emerging technique of tagged DIS (TDIS), the DIS reaction off of a bound nucleon is "tagged" by the detection of a second spectator nucleon, which carries information on the initial configuration of the nucleus. TDIS measurements are sensitive to the momentum dependence of bound nucleon structure, and can discriminate between different EMC effect hypotheses. This talk will summarize current and future TDIS experiments, including preliminary results from measurements of the structure of high-momentum protons bound in deuterium.