Collider Signals of Gravitational Fixed Points

Details Collider Signals of Gravitational Fixed Points Collider Signals of Gravitational Fixed Points

2007-07-21

arxiv.org/abs/0707.3182v1

JHEP 0712:009,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages

Scientific paper

10.1088/1126-6708/2007/12/009

Recent studies have shown that the poor perturbative behavior of General Relativity in the ultraviolet regime may be ameliorated by the existence of a non-Gaussian fixed point which renders the theory asymptotically safe and possibly non-perturbatively renormalizable. This results in a running of the (effective) gravitational coupling such that gravity becomes weaker at high energies. We parameterize this effective coupling with a form factor and study its consequences at the LHC and ILC in models with large extra dimensions or warped extra dimensions. We find significant effects in the processes of Kaluza-Klein (KK) graviton exchange or resonant KK graviton production in both the Drell-Yan reaction as well as in $e^+e^-\to f\bar f$. On the otherhand, processes leading to KK graviton emission show qualitatively less sensitivity to the presence of a form factor. In addition, we examine tree-level perturbative unitarity in $2\to 2$ gravity-mediated scattering and find that this form factor produces a far better behaved amplitude at large center of mass energies.

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