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arXiv · hep-th/9911019

String theory predictions for future accelerators

E. Dudas·J. Mourad
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Abstract

We consider, in a string theory framework, physical processes of phenomenological interest in models with a low string scale. The amplitudes we study involve tree-level virtual gravitational exchange, divergent in a field-theoretical treatment, and massive gravitons emission, which are the main signatures of this class of models. First, we discuss the regularization of summations appearing in virtual gravitational (closed string) Kaluza-Klein exchanges in Type I strings. We argue that a convenient manifestly ultraviolet convergent low energy limit of type I string theory is given by an effective field theory with an arbitrary cutoff $Λ$ in the closed (gravitational) channel and a related cutoff $M_s^2/Λ$ in the open (Yang-Mills) channel. We find the leading string corrections to the field theory results. Second, we calculate exactly string tree-level three and four-point amplitudes with gauge bosons and one massive graviton and examine string deviations from the field-theory result.

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E. Dudas, J. Mourad. 1999-11-24. String theory predictions for future accelerators. https://doi.org/10.1016/s0550-3213(00)00082-1

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