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Off-shell amplitudes for nonoriented closed strings

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

hep-tharXiv:hep-th/9808164

Abstract

In the context of the bosonic closed string theory, by using the operatorial formalism, we give a simple expression of the off-shell amplitude with an arbitrary number of external massless states inserted on the Klein bottle.

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