A note on on-shell recursion relation of string amplitudes

Published 5 Oct 2012 in hep-th and hep-ph | (1210.1776v3)

Abstract: In the application of on-shell recursion relation to string amplitudes, one challenge is the sum over infinite intermediate on-shell string states. In this note, we show how to sum these infinite states explicitly by including unphysical states to make complete Fock space.

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