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We construct 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 them to be projective invariant. In particular our prescription leads, in the low-energy limit, to the three-gluon amplitude in the usual covariant gauge.

Type

Journal article

Journal

Modern Physics Letters A

Publication Date

20/04/1999

Volume

14

Pages

799 - 808