Lepton flavor violating tau decays in type-III seesaw mechanism

) decays are studied in the framework of the type-III seesaw model, in which new triplet fermions with a zero hypercharge (Y=0) interact with ordinary lepton doublets via Yukawa couplings, and affect tree-level leptonic Z-boson couplings. We investigate the experimental bound from the leptonic Z decay to get contraint on the exsiting parameters space. We predict that the upper limits on the branching ratios of

\tau\to \ell P(V)

and

\tau\to 3\ell

can reach the experimental current limits.

Note:

15 pages, 1 figure, to match version in press in Phys.Rev.D

13.35.Dx
tau: semileptonic decay
tau: leptonic decay
tau: decay rate
tau: branching ratio
lepton number: violation
lepton: left-handed
fermion: triplet
neutrino: mass
symmetry: SU(2)

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