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We present the 3- and 4-point tree-level scattering amplitudes involvingfirst-massive states in closed Type IIB superstring theory, computed in theMinkowski vacuum. In particular, the 3-point amplitudes are computed for allpossible combinations of first-massive and massless string states, and the4-point amplitudes are computed for all such combinations involving at most twomassive string states. We verify that unitarity is satisfied by checking themassless and first-massive poles of a 4-point amplitude. This paper is intendedto serve as a reference providing all these amplitudes explicitly in consistentconventions as well as worldsheet correlators necessary to perform furthercomputations beyond those listed here.

Massive Type IIB Superstrings Part I: 3- and 4-Point Amplitudes