Flavor Changing Fermion-Graviton Vertices
Abstract
We study the flavor-changing quark-graviton vertex that is induced at the one-loop level when gravitational interactions are coupled to the standard model. Because of the conservation of the energy-momentum tensor the corresponding form factors turn out to be finite and gauge-invariant. Analytical expressions of the form factors are provided at leading order in the external masses. We show that flavor-changing interactions in gravity are local if the graviton is strictly massless while if the graviton has a small mass long-range interactions inducing a flavor-changing contribution in the Newton potential appear. Flavor-changing processes with massive spin-2 particles are also briefly discussed. These results can be generalized to the case of the lepton-graviton coupling.
Cite
@article{arxiv.0812.3262,
title = {Flavor Changing Fermion-Graviton Vertices},
author = {G. Degrassi and E. Gabrielli and L. Trentadue},
journal= {arXiv preprint arXiv:0812.3262},
year = {2009}
}
Comments
21 pages, 2 figures. New results and two references added. To be published in PRD