  A blowup of vertical emittance has been observed in particle tracking
simulations with beam-beam and lattice misalignments. It was somewhat
unexpected, since estimation without lattice errors did not predict such a
blowup unless a residual vertical dispersion at the interaction point (IP) is
larger than a certain amount. Later such a blowup has been seen in a tracking
of lattices without beam-beam effect.
  A possible explanation of the blowup is given by a Vlasov model for an
equilibrium of quadratic transverse moments in the synchrotron phase space.
This model predicts such a blowup as a synchro-beta resonance mainly near the
first synchrotron sideband of the main x-y coupling resonance line.
