Elsevier

Nuclear Physics B

Volume 392, Issue 2, 8 March 1993, Pages 345-368
Nuclear Physics B

Unitarity and normalization of string amplitudes

https://doi.org/10.1016/0550-3213(93)90676-GGet rights and content

Abstract

The normalization of string amplitudes is fixed at arbitrary genus by the requirement that the elastic two-particle scattering amplitude exponentiates in the Regge regime. We use this approach to determine the overall normalization of the N-string g-loop vertex in three cases: for the bosonic string; for the type II superstring in the Neveu-Schwarz sector; and for a heterotic string model in the sector containing Yang-Mills interactions. We present a regularization procedure that removes the tachyonic contribution from the bosonic string calculation.

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