Bounds on LFV Higgs decays in a vector-like lepton model and searching for doubly charged leptons at the LHC

Chuan Hung Chen, Takaaki Nomura

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10 Citations (Scopus)


The Higgs-portal lepton flavor violation is studied in a vector-like lepton model. To avoid the constraints from rare Z→ℓi±ℓj∓ decays, we introduce two triplet vector-like leptons, (1 , 3) - 1 and (1 , 3) 0. The resultant branching ratio for h→ μτ can be up to 10 - 4 when the constraints from the invisible Z decays are applied. As a result, the signal strength for the ττ channel has a 12% deviation from the standard model prediction, while the muon g- 2 is two orders of magnitude smaller than the data, and BR (τ→ μγ) is of the order of 10 - 12. A predicted doubly charged lepton in pp collisions at s=13 TeV is analyzed, and it is found that the interesting production channels are pp→(Ψ1--Ψ1++,Ψ1±±Ψ1∓). Both single and pair production cross sections of Ψ1++ are comparable, and can be a few hundred fb. The main decay channels for the doubly charged lepton are Ψ ± ±→ ℓ±W±, and for the heavy singly charged lepton they are Ψ1±→νW±,ℓ±Z. The numerical analysis is carried out with regard to 13 TeV LHC with 100 fb- 1 luminosity.

Original languageEnglish
Article number353
JournalEuropean Physical Journal C
Issue number6
Publication statusPublished - 2016 Jun 1


All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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