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arXiv · hep-ph/0305291

R-Parity Violation in a SUSY GUT Model and Radiative Neutrino Masses

Yoshio Koide·Joe Sato
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Abstract

Within the framework of an SU(5) SUSY GUT model, a mechanism which effectively induces R-parity-violating terms below the unification energy scale M_X is proposed. The model has matter fields \bar{5}_{L(+)}+10_{L(-)} and Higgs fields H_{(-)} and \bar{H}_{(+)} in addition to the ordinary Higgs fields H_{(+)} and \bar{H}_{(-)} which contribute to the Yukawa interactions, where (\pm) denote the transformation properties under a discrete symmetry Z_2. The Z_2 symmetry is only broken by the μ-term \bar{H}_{(+)}H_{(-)} softly, so that the \bar{5}_{(+)}\leftrightarrow \bar{H}_{(+)} \leftrightarrow \bar{H}_{(-)} mixing appears at μ< m_{SB}, i.e. R-parity violating terms \bar{5}_L\bar{5}_L 10_L are effectively induced from the Yukawa interactions \bar{H}_{(-)}\bar{5}_{L(+)}10_{L(-)}, so that the effective coupling constants λ_{ijk} of ν_{Li} e_{Lj} e_{Rk}^c and ν_{Li} d_{Rj}^c d_{Lk} are proportional to the mass matrices (M_e^*)_{jk} and (M_d^\dagger)_{jk}, respectively. The parameter regions which are harmless for the proton decay are investigated. Possible forms of the radiatively induced neutrino mass matrix are also investigated.

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Yoshio Koide, Joe Sato. 2003-07-11. R-Parity Violation in a SUSY GUT Model and Radiative Neutrino Masses. https://doi.org/10.1103/physrevd.68.056004%2010.1103%2Fphysrevd.69.019902

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