The discovery of the Higgs boson at the LHC opens the door to the next phase of experimental exploration in fundamental physics. While details will clearly be informed by what will be learned from the next run of the LHC, it is already clear that, regardless of what is seen at the LHC, the future of the field hinges on the construction of new accelerators, to offer a much clearer picture of the Higgs itself, and propel us much deeper into the energy frontier.  There are already a range of options under serious consideration, ranging from linear colliders like the ILC and CLIC, to the more recent proposals of circular colliders both as Higgs factories and 100 TeV proton-proton colliders.

This rapid response program will  bring together leading accelerator physicists, experimentalists and theorists, to foster a thorough discussion of the wide array of physics opportunities and technical challenges associated with these machines.