Hot Topics in Ultra-Peripheral Collisions
  Ultra-peripheral collisions of relativistic heavy ions involve long-ranged electromagnetic interactions at impact parameters too large for hadronic interactions to occur. The nuclear charges are large; with the coherent enhancement, the cross sections are also large. Many types of photonuclear and purely electromagnetic interactions are possible. We present here an introduction to ultra-peripheral collisions, and present four of the most compelling physics topics. This note developed from a discussion at a workshop on ``Electromagnetic Probes of Fundamental Physics,'' in Erice, Italy, Oct. 16-21, 2001. 
G. Baur, C. A. Bertulani, M. Chiu, I. F. Ginzburg, K. Hencken, S. R.   Klein, J. Nystrand, K. Piotrzkowski, C. G. Roldao, D....