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Paper   IPM / P / 6873
School of Physics
  Title:   Gauge Invariant Operators and Closed String Scattering in Open Field Theory
  Author(s): 
1.  M. Alishahiha
2.  M.R. Garousi
  Status:   Published
  Journal: Phys. Lett. B
  No.:  53
  Vol.:  536
  Year:  2002
  Pages:   129-137
  Supported by:  IPM
  Abstract:
Using the recent proposal for the observables in open string field theory, we explicitly compute the coupling of closed string tachyon and massless states with the open string states up to level two. Using these couplings, we then calculate the tree level S-matrix elements of two closed string tachyons or two massless states in the open string field theory. Up to some contact terms, the results reproduce exactly the corresponding amplitudes in the bosonic string theory.

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