Massless particle production in collisions between high energy strings

Explicit formulas (generalizing the Low-Gribov expressions) are obtained for the amplitudes of production of massless particles (gluons and gravitons) with small transverse momenta on scattering of lower-mass excitations of open and closed strings. In the limit of α' → 0 the results of calculation of the effective vertexes for the inelastic scattering amplitudes in the mullti-Regge kinematics in the Young-Mills theory and in graviton are reproduced