Supersymmetry, Local Horizontal Unification, and a Solution to the Flavor Puzzle

K. S. Babu and R. N. Mohapatra
Phys. Rev. Lett. 83, 2522 – Published 27 September 1999
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Abstract

Supersymmetric gauge models with local horizontal symmetries are known to generate large flavor-changing neutral-current effects induced by supersymmetry breaking D terms. We show how the presence of a U(1) gauge symmetry solves this problem. We then construct a realistic gauge model with SU(2)H×U(1)H as the local horizontal symmetry and suggest that the U(1)H factor may be identified with the anomalous U(1) of string theory. This model explains the observed hierarchies among the quark masses and mixing angles, accommodates naturally the solar and atmospheric neutrino data, and provides simultaneously a solution to the supersymmetric flavor problem. The model can be excluded if the rare decay μeγ is not observed in the current round of experiments.

  • Received 15 June 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.2522

©1999 American Physical Society

Authors & Affiliations

K. S. Babu1 and R. N. Mohapatra2

  • 1Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078
  • 2Department of Physics, University of Maryland, College Park, Maryland 20742

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Vol. 83, Iss. 13 — 27 September 1999

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