"Two-photon production of leptons and search of new particles"

Abstract
This review is devoted to the following problems : 1. Some little-known applications and effects connected with the two-photon e⁺ e^--pair production : energy losses of fast muons in the matter ; the investigation of π and K form factors ; the possibility to calibrate accelerators with the colliding pp, p[MATH] or ep beams ; measuring the high energy photon polarization, measuring the real part of proton Compton effect, etc. 2. Somme processes of high order in α for the electron storage rings having cross section high enough, two e⁺ e^--pair production (ee → eee⁺ e^- e⁺ e^-) ; parapositronium production ; production of photons with MeV energy for large emission angles. 3. The search of new particles: intermediate vector mesons, Dirac's monopols and massive leptons. 4. Some questions of the two-photon massive µ-pair production.