Quantum gravity and extra dimensions at highenergy colliders
Abstract
Recently it has been pointed out that the characteristic quantumgravity scale could be as low as the weak scale in theories with gravity propagating in higher dimensions. The observed smallness of Newton's constant is a consequence of the large compactified volume of the extra dimensions. We investigate the consequences of this supposition for highenergy collider experiments. We do this by first compactifying the higherdimensional theory and constructing a 3 + 1dimensional lowenergy effective field theory of the graviton KaluzaKlein excitations and their interactions with ordinary matter. We then consider graviton production processes, and select γ + E̵and jet + E̵ signatures for careful study. We find that both a 1 TeV ∊^{+}∊^{} collider and the CERN LHC will be able to reliably and perturbatively probe the fundamental gravity scale up to several TeV with the precise value depending on the number of extra dimensions. Similarly, searches at LEP2 and the Tevatron are able to probe this scale up to approximately 1 TeV. We also discuss virtual graviton exchange, which induces local dimensioneight operators associated with the square of the energymomentum tensor. We estimate the size of such operators and study their effects on f overlinef → γγ observables.
 Publication:

Nuclear Physics B
 Pub Date:
 April 1999
 DOI:
 10.1016/S05503213(99)000449
 arXiv:
 arXiv:hepph/9811291
 Bibcode:
 1999NuPhB.544....3G
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 50 pages, latex, 10 figures