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On off-shell bosonic string amplitudes

L. Cappiello, R. Marotta, R. Pettorino, F. Pezzella

hep-tharXiv:hep-th/9804032

Abstract

We give a simple prescription for computing, in the framework of the bosonic string theory, off-shell one-loop amplitudes with any number of external massless particles, both for the open and for the closed string. We discuss their properties and, in particular, for the two-string one-loop amplitudes we show their being transverse.

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