• Bounds on charged lepton mixing with exotic charged leptons

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      https://www.ias.ac.in/article/fulltext/pram/062/05/1029-1040

    • Keywords

       

      Lepton; lepton mixing; exotic lepton; unitarity

    • Abstract

       

      We examine the effects of mixing induced light heavy charged lepton neutral currents on the partial wave amplitude for the process l+lZZ (withl = e,μ or τ). By imposing the constraints that the amplitude should not exceed the perturbative unitarity limit at high energy (√s = Λ), we obtain bounds on light heavy charged lepton mixing parameter sin2(2θLa) where θLa is the mixing angle of the ordinary charged lepton with its exotic partner. For Λ = 1 TeV, no bound is obtained on sin2 (2θLa) formE < 0.69 TeV. However, sin2 (2θLa) ≤ 1.52×10−5 formE = 5 TeV, sin2 (2θLa) ≤ 2.41 ×10−7 formE = 10 TeV. Similarity for Λ = ∞ no bound is obtained on sin2 (2θLa) for mE < 1.97 TeV and sin2 (2θLa) ≤ 0.15 formE = 5 TeV and sin2 (2θLa) ≤ 3.88×10-2 formE = 10 TeV.

    • Author Affiliations

       

      Jai Kumar Singhal1

      1. Department of Physics, Government College, Sawai, Madhopur - 322 001, India
    • Dates

       
  • Pramana – Journal of Physics | News

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