Center-edge asymmetry at hadron colliders

Abstract

We investigate the possibility of using the center-edge asymmetry to distinguish graviton exchange from other new physics effects at hadron colliders. Specifically, we study lepton-pair production within the Arkani-Hamed--Dimopoulos--Dvali (ADD) and Randall-Sundrum (RS) scenarios. At the Fermilab Tevatron, the graviton-$Z$ interference is the most important contribution to the center-edge asymmetry, whereas at the CERN LHC, the dominant contribution comes from gluon fusion via graviton exchange, which has no analog at ${e}^{+}{e}^{\ensuremath{-}}$ colliders. We find that spin-2 and spin-1 exchange can be distinguished up to an ADD cutoff scale, ${M}_{H},$ of about 5 TeV, at the 95% C.L. In the RS scenario, spin-2 resonances can be identified in most of the favored parameter space.