Wonderful opportunities await particle physics over the next decade, with the
coming of the Large Hadron Collider at CERN to explore the 1-TeV scale
(extending efforts at LEP and the Tevatron to unravel the nature of electroweak
symmetry breaking) and many initiatives to develop our understanding of the
problem of identity: what makes a neutrino a neutrino and a top quark a top
quark. Here I have in mind the work of the B factories and the Tevatron
collider on CP violation and the weak interactions of the b quark; the
wonderfully sensitive experiments at Brookhaven, CERN, Fermilab, and Frascati
on CP violation and rare decays of kaons; the prospect of definitive
accelerator experiments on neutrino oscillations and the nature of the
neutrinos; and a host of new experiments on the sensitivity frontier. We might
even learn to read experiment for clues about the dimensionality of spacetime.
If we are inventive enough, we may be able to follow this rich menu with the
physics opportunities offered by a linear collider and a (muon storage ring)
neutrino factory. I expect a remarkable flowering of experimental particle
physics, and of theoretical physics that engages with experiment. I describe
some of the great questions before us and the challenges of providing the
instruments that will be needed to define them more fully and-eventually-to
answer them.Comment: Invited paper at the 2001 Particle Accelerator Conference, Chicago; 5
pages; uses JAC2001.cls (included
