"Semiclassical methods for the description of tunneling
in high-energy collisions"
Claudio Rebbi,
Boston University

I will describe a semiclassical technique for calculating the
suppression factor in high-energy processes that occur through
tunneling and are characterized by weak coupling and low particle
number in the initial state.  I will illustrate the computational
challenges that one encounters, how they can be overcome, and some
results which have been obtained, with particular attention to the
problem of baryon number violation in electroweak collisions.