Study of Beam-Beam Effects at PEP-II

Using a self-consistent three-dimensional simulation running on parallel supercom- puters, we have modeled the beam-beam interaction at the PEP-II asymmetric e+e− collider. To provide guidance for luminosity improvement, we scanned the tunes and currents in both rings and computed their impact on the luminosity and transverse beam sizes. We also studied the effects of colliding the beams with a small crossing angle. Where possible, the code was benchmarked against experimental measurements of luminosity and beam sizes, yielding an acceptable agreement.