Soliton-antisoliton pair production in particle collisions
  We propose general semiclassical method for computing the probability of soliton-antisoliton pair production in particle collisions. The method is illustrated by explicit numerical calculations in (1+1)-dimensional scalar field model. We find that the probability of the process is suppressed by an exponentially small factor which is almost constant at high energies. 
S.V. Demidov, D.G. Levkov
hep-th cond-mat.stat-mech hep-ph