Drell-Yan and diphoton production at hadron colliders and low scale gravity model - art. no. 076003

In the model of Arkani-Hamed, Dimopoulos, and Dvali where gravity is allowe d to propagate in the extra dimensions of very large size, virtual graviton exchange between the standard model particles can give rise to signatures that can be tested in collider experiments. We study these effects in dilep ton and diphoton production at hadron colliders. Specifically, we examine t he double differential cross section in the invariant mass and scattering a ngle, which is found to be useful in separating the gravity effects from th e standard model. In this work, sensitivity obtained using the double diffe rential cross section is higher than that in previous studies based on sing le differential distributions. Assuming no excess of events over the standa rd model predictions, we obtain the following 95% confidence level lower li mits on the effective Planck scale: 0.9-1.5 TeV in the Fermilab Tevatron ru n I, 1.3-2.5 TeV in run IIa, 1.7-3.5 TeV in run IIb, and 6.5-12.8 TeV at th e CERN LHC. The range of numbers corresponds to the number of extra dimensi ons n = 7-2.