Influence of Vertical Dispersion and Crossing Angle on the
 Performance of the LHC

Misalignments, magnetic field deviations and the beam
crossing angle induce closed orbit deviations and residual
dispersion at the interaction points of the LHC. These in
turn excite synchro-betatron resonances. We present a
numerical investigation of these effects and their
influence on the luminosity. Bunch length effects are
importantant are included in the model by means of the
numerical code BBC. The crossing angle excites resonances
that increase particle amplitudes when the tunes are near
resonance while vertical dispersion changes the resonance
strength. The influence on the beam core size is studied.
For the nominal LHC working point, a 13th-order resonance
may be crossed by the particles in the beam. The width of
the synchrotron sidebands are evaluated.