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.

21 pages, 2 figures. New results and two references added. To be published in PRD

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• Supersymmetry - When Theory Inspires Experimental Searches
• Testing spin-2 mediator by angular observables in $b\to s{\mu }^{+}{\mu }^{-}$
• Electroweak Corrections to Photon Scattering, Polarization and Lensing in a Gravitational Background and the Near Horizon Limit
• Searching for the dark sector in two-body anti-muon decay with the polarization of monochromatic positrons
• Searches for Power-Law Warped Extra Dimensions