Beam-beam-induced orbit effects at LHC
  For high bunch intensities the long-range beam-beam interactions are strong enough to provoke effects on the orbit. As a consequence the closed orbit changes. The closed orbit of an unperturbed machine with respect to a machine where the beam-beam force becomes more and more important has been studied and the results are presented in this paper. 
M. Schaumann (RWTH Aachen U.), R. Alemany Fernandez (CERN)
physics.acc-ph