2008/03/24 by M. C. González-García, M. C. Gonzalez-Garcia, P. C. de Holanda +2 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1088/1475-7516/2008/06/019
published as JCAP0806:019,2008 · 13 pages, 3 figures. Minor changes due to precision in numerical factors and correction in figure labels. References added. Conclusions remain unchanged
arxiv created 2008/03/24 · openalex publication_date 2008/06/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We have investigated the impact of long-range forces induced by unparticle operators of scalar, vector and tensor nature coupled to fermions in the interpretation of solar neutrinos and KamLAND data. If the unparticle couplings to the neutrinos are mildly non-universal, such long-range forces will not factorize out in the neutrino flavour evolution. As a consequence large deviations from the observed standard matter-induced oscillation pattern for solar neutrinos would be generated. In this case, severe limits can be set on the infrared fixed point scale, Λ u , and the new physics scale, M , as a function of the ultraviolet ( d UV ) and anomalous ( d ) dimension of the unparticle operator. For a scalar unparticle, for instance, assuming the non-universality of the lepton couplings to unparticles to be of the order of a few per mil we find that, for d UV = 3 and d = 1.1, M is constrained to be TeV ( TeV) if Λ u = 1 TeV (10 TeV). For given values of Λ u and d , the corresponding bounds on M for vector (tensor) unparticles are ∼100 ( ) times those for the scalar case. Conversely, these results can be translated into severe constraints on universality violation of the fermion couplings to unparticle operators with scales which can be accessible at future colliders.