Sensitivity Study of Extra Dimensions at TeV $e^{+}{e}^{-}$ colliders

Abstract

We study the sensitivity reach of $0.5-2$ TeV $e^{+}{e}^{-}$ linear colliders in the context of the ADD model, in which gravity becomes strong at TeV scale. We include the real emission channel $e^{+}{e}^{-}\to \gamma G$, as well as the virtual-graviton-exchange channels $e^{+}{e}^{-}\to \gamma \gamma ,q\bar{q},{\mu }^{+}{\mu }^{-},{\tau }^{+}{\tau }^{-},e^{+}{e}^{-}$. Assuming no excess of events over the standard model predictions, we obtain the lower 95% C.L. limits on the effective Planck scale. These limits are better than those obtained in the Run II's of the Tevatron and comparable to those of the LHC.

6 pages. A contribution to the theory meeting on physics at linear colliders, 15--17 March 2001, KEK, Japan