Diffusion due to the Beam-Beam Interaction and Fluctuating Fields in   Hadron Colliders
  Random fluctuations in the tune, beam offsets and beam size in the presence of the beam-beam interaction are shown to lead to significant particle diffusion and emittance growth in hadron colliders. We find that far from resonances high frequency noise causes the most diffusion while near resonances low frequency noise is responsible for the large emittance growth observed. Comparison of different fluctuations shows that offset fluctuations between the beams causes the largest diffusion for particles in the beam core. 
Tanaji Sen (DESY), James A. Ellison(UNM)