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Lepton FCNC in Type III Seesaw Model

Feb, 2009
17 pages
Published in:
  • JHEP 09 (2009) 027
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Abstract: (arXiv)
In Type III seesaw model, there are tree level flavor changing neutral currents (FCNC) in the lepton sector, due to mixing of charged particles in the leptonic triplet introduced to realize seesaw mechanism, with the usual charged leptons. In this work we study these FCNC effects in a systematic way using available experimental data. Several FCNC processes have been studied before. The new processes considered in this work include: τ→Pl\tau \to P l, V→llˉ′V \to l \bar l', M→llˉ′M\to l \bar l', M→M′llˉ′M\to M' l \bar l' and muonium-antimuonium oscillation. Results obtained are compared with previously results from li→ljlklˉll_i \to l_j l_k \bar l_l, li→ljγl_i \to l_j \gamma, Z→llˉ′Z \to l \bar l' and μ−e\mu - e conversion. We find that the most stringent constraint on ee to τ\tau FCNC effect comes from τ→π0e\tau \to \pi^0 e decay. τ→π0μ\tau \to \pi^0 \mu gives a very stringent constraint on μ\mu to τ\tau FCNC effect, comparable with that obtained from τ→μμˉμ\tau \to \mu \bar \mu \mu. The strongest constraint on ee to μ\mu FCNC effect comes from μ−e\mu - e conversion in atomic nuclei.
  • 11.15.Tk
  • 14.80.-j
  • 98.80.Cq
  • 11.25.Hf
  • neutral current: flavor changing
  • tau: semileptonic decay
  • seesaw model
  • mixing
  • lepton: triplet
  • vector meson: leptonic decay
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