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We use the sewing procedure in the operator formalism to construct explicitly the two-loop vertex for the (b,c) system of string theories in its more general form, needed to compute amplitudes involving picture-changed states. By using this operator we show that the contribution of the reparametrization ghosts to superstring amplitudes is just the same as their contribution to bosonic string ones. © 1991.

Original publication

DOI

10.1016/0370-2693(91)90239-M

Type

Journal article

Journal

Physics Letters B

Publication Date

07/02/1991

Volume

255

Pages

223 - 229