Getting to the top with extra dimensions

Abstract

The prospect of large extra dimensions and an effective theory of gravity at around a TeV has interesting experimental consequences. In these models, the Kaluza-Klein modes interact with Standard Model particles and these interactions lead to testable predictions at present and planned colliders. We investigate the effect of virtual exchanges of the spin-2 Kaluza-Klein modes in the production cross-section of $t\bar{t}$ pairs at the Tevatron and the LHC and find that the $t\bar{t}$ cross-section can be an effective probe of the large extra dimensions. This enables us to put bounds on the effective low-energy scale.

7 pages, latex, 1 ps figure, revised version to appear in Phys. Lett. B

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• The Hierarchy Problem and New Dimensions at a Millimeter
• New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
• Extra Spacetime Dimensions and Unification

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