Journal of Particle Physics

Download PDF (969 KB) PP. 30 - 50 Pub. Date: July 19, 2017

DOI: 10.22606/jpp.2017.11003

• Mario E. Gómez^*
  Departamento de Ciencias Integradas, Universidad de Huelva, 21071 Huelva, Spain
• Sven Heinemeyer
  Instituto de Física Teórica, (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
• Muhammad Rehman
  Riphah Institute of Computing and Applied Sciences, Riphah International University, 54770 Lahore, Pakistan

Within the MSSM, we have evaluated the decay rates for the lepton flavour violating Higgs boson decays (LFVHD) h → lilj where li,j are charged leptons and i 6= j. This has been done in a model independent (MI) way as well as in supersymmetric high scale seesaw models, in particular Type I see-saw model. Lepton flavour violation (LFV) is generated by non-diagonal entries in the mass matrix of the sleptons. In a first step we use the model independent approach where LFV (off-diagonal entries in the mass matrix) is introduced by hand while respecting the direct search constraints from the charged lepton flavor violating (cLFV) processes. In the second step we use high scale see-saw models where LFV is generated via renormalization group equations (RGE) from the grand unification scale (GUT) down to electroweak scale. cLFV decays are the most restrictive ones and exclude a large part of the parameter space for the MI as well as the high scale see-saw scenarios. Due to very strict constraints from cLFV, it is difficult to find large corrections to LFVHD. This applies in particular to h → τµ where hints of an excess have been observed. If this signal is confirmed, it could not be explained with the models under investigation.

Supersymmetry, lepton falvour violation, Higgs decays.

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