Long range beam-beam interactions in PEP-II
  The PEP-II luminosity upgrade foreseen for the next years requires an increased number of bunches and lower beta-y* with minor modifications to the present Interaction Region (IR2). When increasing the collision frequency the beams separation in IR2 can be an issue. A study of the effect of the parasitic crossings for both the head-on and horizontal crossing angle options is presented. 
M. E. Biagini