Collider Signatures of New Large Space Dimensions

Abstract

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.

Figures (2)

• Figure 1: Energy spectrum of single photons recoiling against higher-dimensional gravitons G, computed for $e^+e^-$ collisions at $\sqrt{s} = 183$ GeV with an angular cut $|\cos\theta| < 0.95$. The dotted curve is the Standard Model expectation. The solid curves show the additional cross section expected in the model of ref. ADD with (a) $n=2$, $M = 1200$ GeV, (b) $n=6$, $M = 520$ GeV.
• Figure 2: Spectrum of missing energy in events with one jet, computed for $p\overline{p}$ collisions at $\sqrt{s} = 1.8$ TeV, with a rapidity cut $|y| < 2.4$. The dotted curve is the Standard Model expectation. The solid curves show the additional cross section expected in the model of ref. ADD with (a) $n=2$, $M = 750$ GeV, (b) $n=6$, $M = 610$ GeV.