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Paper   IPM / Physic / 7243
School of Physics
  Title:   S-Matrix Elements and Closed String Tachyon Couplings in Type 0 Theory
  Author(s):  M.R. Garousi
  Status:   Published
  Journal: Nucl. Phys. B
  Vol.:  705
  Year:  2005
  Pages:   212-238
  Supported by:  IPM
We evaluate the sphere level S-matrix element of two tachyons and two massless NS states, the S-matrix element of four tachyons, and the S-matrix element of two tachyons and two Ramon-Ramond vertex operators, in type 0 theory. We then find an expansion for theses amplitudes that their leading order terms correspond to a covariant tachyon action. To the order considered, there are no T4, T2(\prt T)2, T2H2, nor T2R tachyon couplings, whereas, the tachyon couplings F\bF T and T2F2 are non-zero.

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