Speaker
Boris Kopeliovich
(UTFSM, Valparaiso)
Description
The anomalous excess of soft photons radiated in inelastic hadronic collisions, has been challenging the physics community over four decades, but no solution was proposed so far. We argue that the problem is rooted in comparison with an incorrect model for radiative corrections, usually called bremsstrahlung model. It is based on an illegitimate extension of the Low theorem to radiative multi-particle production processes 2 → n + γ. We demonstrate that this breaks down unitarity of the S-matrix in contradiction with the optical theorem. We propose an alternative description of photon radiation within the light-front color-dipole phenomenology. The results of calculations are in a good accord with available data.
