Small m[subscript ν] due to R-symmetry breaking for small Λ
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Davies-2012-symmetry breaking for small.pdf
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Author(s)
Davies, Rhys
McCullough, Matthew P.
Date Issued
July 2012
Journal
Physical Review D
Publisher
American Physical Society
Citation
Davies, Rhys, and Matthew McCullough. “Small m[subscript ν] due to R-symmetry breaking for small Λ.” Physical Review D 86.2 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We describe a class of supersymmetric models in which neutrinos are kept light by an R-symmetry. In supergravity, R-symmetry must be broken to allow for a small cosmological constant after supersymmetry breaking. In the class of models described here, this R-symmetry breaking results in the generation of Dirac neutrino masses, connecting the tuning of the cosmological constant to the puzzle of neutrino masses. Surprisingly, under the assumption of low-scale supersymmetry breaking and superpartner masses close to a TeV, these masses are independent of the fundamental supersymmetry-breaking scale, and accommodate the correct magnitude. This offers a novel explanation for the vastly different scales of neutrino and charged fermion masses. These models require that R-symmetric supersymmetry exists at the TeV scale, and predict that neutrino masses are purely Dirac, implying the absence of neutrinoless double β decay. Interesting collider signals can arise due to charged scalars which decay leptonically, with branching ratios determined by the neutrino mixing matrix.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.86.025014
