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Enhancing li→3lj with the Z0-penguin

M. Hirsch1,*, F. Staub2,†, and A. Vicente3,‡

  • 1AHEP Group, Instituto de Física Corpuscular–C.S.I.C./Universitat de València Edificio de Institutos de Paterna, Apartado 22085, E–46071 València, Spain
  • 2Physikalisches Institut der Universität Bonn, 53115 Bonn, Germany
  • 3Laboratoire de Physique Théorique, CNRS–UMR 8627, Université de Paris-Sud 11 F-91405 Orsay Cedex, France

  • *mahirsch@ific.uv.es
  • †fnstaub@physik.uni-bonn.de
  • ‡avelino.vicente@th.u-psud.fr
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Phys. Rev. D 85, 113013 – Published 26 June, 2012Erratum Phys. Rev. D 91, 059902 (2015)

DOI: https://doi.org/10.1103/PhysRevD.85.113013

Abstract

Lepton flavor violation has been observed in neutrino oscillations. For charged lepton flavor violation decays only upper limits are known, but sizable branching ratios are expected in many neutrino mass models. High-scale models, such as the classical supersymmetric seesaw, usually predict that decays li→3lj are roughly a factor α smaller than the corresponding decays li→ljγ. Here we demonstrate that the Z0-penguin diagram can give an enhancement for decays li→3lj in many extensions of the minimal supersymmetric standard model (MSSM). We first discuss why the Z0-penguin is not dominant in the MSSM with seesaw and show that much larger contributions from the Z0-penguin are expected in general. We then demonstrate the effect numerically in two example models, namely, the supersymmetric inverse seesaw and R-parity violating supersymmetry.

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Erratum

Erratum: Enhancing li→3lj with the Z0-penguin [Phys. Rev. D 85, 113013 (2012)]

M. Hirsch, F. Staub, and A. Vicente
Phys. Rev. D 91, 059902 (2015)

Article Text

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Phys. Rev. D 85, 113013– Published 26 June, 2012
  • Received 16 February 2012

© 2012 American Physical Society

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