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Paper IPM / P / 8761  


Abstract:  
We write the vertex operators of massless NSNS and RR states of Type II superstring theory in the presence of Orientifold pplanes. They include the usual vertex operators of Type II theory and their images. We then calculate the twopoint functions of these vertex operators at the projective plane PR_2 level. We show that the result can be written in the Venezianotype formulae, with the same kinematic factor that appears in the D_pbranes amplitudes. While the scattering amplitudes with the usual vertex operators are not gauge invariant, the above amplitudes are invariant. From the amplitude describing scattering of two NSNS states off the Oplane, we find the low energy effective action of Oplanes. The result shows a relative factor 2^p6 between couplings to Oplanes and to Dbranes at (')^2 order.
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