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We study scattering of higher spin closed string states at arbitrary masslevels from D-particle in the Regge regime. We extract the infinite ratiosamong high-energy amplitudes of different string states in the fixed angleregime from these Regge string scattering amplitudes. In this calculation, wehave used an identity proved recently based on a signless Stirling numberidentity in combinatorial theory. The complete ratios calculated by thisindirect method include a subset of ratios calculated previously by directfixed angle calculation. Moreover, we discover that in spite of thenon-factorizability of the closed string D-particle scattering amplitudes, thecomplete ratios derived for the fixed angle regime are found to be factorized.These ratios are consistent with the decoupling of high-energy zero norm statescalculated previously.

Higher Spin String States Scattered from D-particle in the Regge Regime and Factorized Ratios of Fixed Angle Scatterings