Vs. Fadin et al., GRIBOVS THEOREM ON SOFT EMISSION AND THE REGGEON-REGGEON-GLUON VERTEXAT SMALL TRANSVERSE-MOMENTUM, Physics letters. Section B, 389(4), 1996, pp. 737-741
In spite of the fact that the Gribov's theorem about the region of app
licability of the soft emission factorization cannot be referred liter
ally to the case of massless charged particles, it can be used for the
calculation of soft emission amplitudes in such a case also. We demon
strate this for the gluon production amplitude in the multi-Regge kine
matics with small transverse momentum.