Abstract
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 diphoton production in γγ, pp̄, and e + e - collisions in the model of low scale gravity. Since in the standard model photon-photon scattering only occurs via box diagrams, the cross section is highly suppressed. Thus, photon-photon scattering opens an interesting opportunity for studying the new gravity interaction, which allows tree-level photon couplings. In addition, we also examine the diphoton production at hadronic and e + e - colliders. We derive the limits on the cutoff scale from the available diphoton data and also estimate the sensitivity reach in run II at the Fermilab Tevaton and at the future linear e + e - colliders. ©1999 The American Physical Society.