Third Latin American Symposium on High Energy Physics PROCEEDINGS

Abstract: In this work we use the solar neutrino fluxes as a laboratory to study a possible violation of the equivalence principle (VEP). Using an extended parametrized post-Newtonian formulation, which includes flavor dependent couplings of neutrinos to the gravitational interaction, we analyze the current data on the rates, energy spectrum,and seasonal variations. We nd that there are two solutions which can explain the data; one of them corresponds to VEP vacuum oscillations, and the other to a VEP-MSW resonance. Both solutions imply restrictions on the VEP eect whic are several orders of magnitud below the present limits. 1