Direct signals of low scale gravity ate+e−colliders

Gravity can become strong at the TeV scale in the theory of extra dimensions. An effective Lagrangian can be used to describe the gravitational interactions below a cutoff scale. In this work, we study the associated production of the gravitons with a $Z$ boson or a photon at $e^{+}{e}^{-}$ colliders of energies of the CERN LEPII to the Next Linear Colliders $(\sqrt{s}=0.25\mathrm{}–1.5\mathrm{TeV})$ and calculate the sensitivity to the new interactions. We also obtain the limit on the cutoff scale using the present data from LEPII.