Collider Signatures of New Large Space Dimensions
  Recently, Arkani-Hamed, Dimopoulos, and Dvali have proposed that there are extra compact dimensions of space, accessible to gravity but not to ordinary matter, which could be macroscopically large. In this letter, we argue that high-energy collider processes in which gravitons are radiated into these new dimensions place significant, model-independent constraints on this picture. We present the constraints from anomalous single photon production at e+e- colliders and from monojet production at hadron colliders. 
Eugene A. Mirabelli, Maxim Perelstein, and Michael E. Peskin