Nonlinear Phenomena in Complex Systems, 2007, Vol.10, No.4, pp.401-406

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2007, Vol.10, No.4, pp.401-406

Identifying Large Extra Dimensions at the LHC with Center-Edge Asymmetry.
I. A. Serenkova and A. A. Pankov

Arkani-Hamed, Dimopoulous, and Dvali have proposed a model (ADD) of low-scale quantum gravity featuring large extra dimensions. It has been shown that in such a model the exchange of Kaluza-Klein (KK) towers of gravitons can enhance the production rate of lepton pairs at high invariant mass in proton-proton collisions at the LHC. The amount of enhancement is characterized by the parameter M_S, the fundamental Planck scale in the bulk extra dimensions. We study the possibility of using the center-edge asymmetry to distinguish spin-2 Kaluza-Klein graviton exchange within the ADD scenario from other new physics effects described by spin-1 exchange in lepton-pair production at the LHC. We find that the LHC detectors will be capable of discovering and identifying graviton spin-2 exchange effects in the ADD scenario with M_S ranging from 4.6 TeV to 9.4 TeV depending on luminosity and number of extra dimensions.
Key words: lepton-pair production, graviton spin-2 exchange effects, extra dimensions

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