Bounds on charged lepton mixing with exotic charged leptons
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We examine the effects of mixing induced light heavy charged lepton neutral currents on the partial wave amplitude for the process l+l− →ZZ (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.
Volume 97, 2023
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