Searching for quarks in the deuteron

The deuteron has been studied in numerous elastic scattering and photodisintegration experiments over a wide range of momentum transfers. A primary motivation is investigating the validity of theories based on hadronic vs. quark degrees of freedom. It is often thought that hadronic approaches will break down at large momentum transfers, and it will be necessary to use quark degrees of freedom. I will very briefly review the status of our understanding of the underlying theoretical issues, the world data sets for elastic scattering and photodisintegration, and the ability of hadronic and quark based theories to explain the data. Hadronic theories appear to provide good explanations for elastic scattering, but photodisintegration is very difficult to understand. (author)