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arXiv · hep-ph/0004166

Neutrinos and Gauge Unification

J. A. Casas·J. R. Espinosa·A. Ibarra·I. Navarro
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Abstract

The approximate unification of gauge couplings is the best indirect evidence for low-energy supersymmetry, although it is not perfect in its simplest realizations. Given the experimental evidence for small non-zero neutrino masses, it is plausible to extend the MSSM with three right-handed neutrino chiral multiplets, with large Majorana masses below the unification scale, so that a see-saw mechanism can be implemented. In this extended MSSM, the unification prediction for the strong gauge coupling constant at M_Z can be lowered by up to \sim 5%, bringing it closer to the experimental value at 1σ, therefore improving significantly the accuracy of gauge coupling unification.

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J. A. Casas, J. R. Espinosa, A. Ibarra, I. Navarro. 2000-04-17. Neutrinos and Gauge Unification. https://doi.org/10.1103/physrevd.63.097302

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