More recently, confirmation of neutrino oscillations and mixing through accelerator-based experiments at KEK in Japan and at Fermilab.
Without the contributions from accelerator experiments, modern particle physics would be far less advanced than it is today. There is no question that accelerators have been essential in particle physics and there is a clear role for them in uncovering the secrets of the Terascale. Indeed, much of the drama surrounding the Terascale comes from the expectation that accelerators will finally expose and then directly investigate the cracks in the Standard Model.
A remarkable aspect of particle physics today is that answers to many of the questions described in this chapter are within the reach of tools that can be built with currently available technologies. The next chapter explores the tools that will be available in the next decade to address the grand questions of particle physics, including those that will enable exploration of the Terascale.