Consistent Off-Shell Tree String Amplitudes
A. Liccardo, F. Pezzella, R. Marotta
Abstract
We give a construction of off-shell tree bosonic string amplitudes, based on the operatorial formalism of the N-string Vertex, with three external massless states both for open and closed strings by requiring their being projective invariant. In particular our prescription leads, in the low-energy limit, to the three-gluon amplitude in the usual covariant gauge.
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