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Paper   IPM / Physic / 7620
School of Physics
  Title:   Closed String S-matrix Elements in Open String Field Theory
1.  M.R. Garousi
2.  G.R. Maktabdaran
  Status:   Published
  Journal: JHEP
  Vol.:  03
  Year:  2005
  Pages:   048
  Supported by:  IPM
We study the S-matrix elements of the gauge invariant operators corresponding to on-shell closed strings, in open string field theory. In particular, we calculate the tree level S-matrix element of two arbitrary closed strings, and the S-matrix element of one closed string and two open strings. By mapping the world-sheet of these amplitudes to the upper half z-plane, and by evaluating explicitly the correlators in the ghost part, we show that these S-matrix elements are exactly identical to the corresponding disk level S-matrix elements in perturbative string theory.

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