Constraints on extra-dimensional theories from virtual-graviton exchange
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
We study the effective interactions induced by loops of extra-dimensional gravitons and show the special role of a specific dimension-6 four-fermion operator, product of two flavour-universal axial currents. By introducing an ultraviolet cut-off, we compare the present constraints on low-scale quantum gravity from various processes involving real-graviton emission and virtual-graviton exchange. The LEP2 limits on dimension-6 four-fermion interactions give one of the strongest constraint on the theory, in particular excluding the case of strongly-interacting gravity at the weak scale.
Cite
@article{arxiv.hep-ph/0301232,
title = {Constraints on extra-dimensional theories from virtual-graviton exchange},
author = {Gian Francesco Giudice and Alessandro Strumia},
journal= {arXiv preprint arXiv:hep-ph/0301232},
year = {2008}
}
Comments
12 pages