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arXiv · 1511.01811

Bounds on Neutrino-Scalar Yukawa Coupling

P. S. Pasquini·O. L. G. Peres
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Abstract

General neutrino-scalar couplings appear in many extensions of Standard Model. We can probe these neutrino-scalar couplings by leptonic decay of mesons and from heavy neutrino search. Our analysis improves the present limits to $|g_e|^2<1.9\times 10^{-6}$ and $|g_μ|^2<1.9\times 10^{-7}$ at 90\% C.L. for massless scalars. For massive scalars we found for the first time the constraints for $g^2_α$ couplings to be $10^{-6}-10^{-1}$ respectively for scalar masses between below 1 MeV and for 300 MeV.

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P. S. Pasquini, O. L. G. Peres. 2016-02-15. Bounds on Neutrino-Scalar Yukawa Coupling. https://doi.org/10.1103/physrevd.93.053007

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