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Paper IPM / P / 7620  


Abstract:  
We study the Smatrix elements of the gauge invariant operators corresponding to onshell closed strings, in open string field theory. In particular, we calculate the tree level Smatrix element of two arbitrary closed strings, and the Smatrix element of one closed string and two open strings. By mapping the worldsheet of these amplitudes to the upper half zplane, and by evaluating explicitly the correlators in the ghost part, we show that these Smatrix elements are exactly identical to the corresponding disk level Smatrix elements in perturbative string theory.
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