Bounds on charged lepton mixing with exotic charged leptons |
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Authors: | Jai Kumar Singhal |
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Affiliation: | (1) Department of Physics, Government College, Sawai, 322 001 Madhopur, India |
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Abstract: | 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(2θ L a ) where θ L a is the mixing angle of the ordinary charged lepton with its exotic partner. For Λ = 1 TeV, no bound is obtained on sin2 (2θ L a ) form E < 0.69 TeV. However, sin2 (2θ L a ) ≤ 1.52×10−5 form E = 5 TeV, sin2 (2θ L a ) ≤ 2.41 ×10−7 form E = 10 TeV. Similarity for Λ = ∞ no bound is obtained on sin2 (2θ L a ) for mE < 1.97 TeV and sin2 (2θ L a ) ≤ 0.15 form E = 5 TeV and sin2 (2θ L a ) ≤ 3.88×10-2 form E = 10 TeV. |
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Keywords: | Lepton lepton mixing exotic lepton unitarity |
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