  Ultraperipheral collisions of high energy protons are a source of
approximately real photons colliding with each other. Photon fusion can result
in production of yet unknown charged particles in very clean events. The
cleanliness of such an event is due to the requirement that the protons survive
during the collision. Finite sizes of the protons reduce the probability of
such outcome compared to point-like particles. We calculate the survival
factors and cross sections for the production of heavy charged particles at the
Large Hadron Collider.
