Speaker
Tilman Plehn
(University of Edinburgh)
Description
LHC searches for extra-dimensional graviton signals suffer from a general
problem: in addition to the fundamental Planck scale we have to introduce
a cutoff (roughly of the order of the Planck scale) to compute collider
effects. A slight misalignment between the Planck scale and this cutoff
has huge effects for example on virtual-graviton observables. Starting
completely generally from an ultraviolet fixed point as a minimal
assumption on the theory of quantum gravity we show that the change in
the anomalous dimension of the graviton propagator naturally regularizes
LHC cross sections without any ad-hoc cutoff procedure. We quantify the
effects of such a description on the rates and uncertainties for
virtual-graviton signals at the LHC.
Author
Tilman Plehn
(University of Edinburgh)
