Bounds on neutrino mixing with exotic singlet neutrinos |
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Authors: | J K Singhal Sardar Singh Ashok K Nagawat N K Sharma |
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Institution: | (1) Department of Physics, Government College, 322 001 Sawai Madhopur, India;(2) Department of Physics, University of Rajasthan, 302 004 Jaipur, India |
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Abstract: | We examine the effects of mixing induced non-diagonal light-heavy neutrino weak neutral currents on the amplitude for the
process
(with a=e, μ or τ). By imposing constraint that the amplitude should not exceed the perturbative unitarity limit at high energy
, we obtain bounds on light-heavy neutrino mixing parameter sin2
where
is the mixing angle. In the case of one heavy neutrino (mass mξ) or mass degenerate heavy neutrinos, for Λ=1 TeV, no bound is obtained for mξ<0.50 TeV. However, sin2
≤3.8 × 10−6 for mξ=5 TeV and sin
≤6.0 × 10−8 for mξ=10 TeV. For Λ=∞, no constraint is obtained for mξ<0.99 TeV and sin2
≤3.8 × 10−2 (for mξ=5 TeV) and sin2
≤9.6 × 10−3 (for mξ=10 TeV). |
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Keywords: | Neutrino neutrino mixing exotic neutrino singlet neutrino |
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