On the ( b, c) system contribution to superstring amplitudes

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 reparametri...

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Bibliographic Details
Published inPhysics letters. B Vol. 255; no. 2; pp. 223 - 229
Main Authors Pettorino, R., Pezzella, F.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 07.02.1991
Elsevier Science
Subjects
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Physics
Mathematical function
Superstring theory
Invariance
Mathematical operator
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(91)90239-M