A Hybrid Type I + III Inverse Seesaw Mechanism in $U(1)_{R-L}$-symmetric MSSM

Cem Murat Ayber; Seyda Ipek

doi:10.1007/JHEP11(2023)085

paper

A Hybrid Type I + III Inverse Seesaw Mechanism in $U (1)_{R - L}$ -symmetric MSSM

arXiv:2308.09686 · doi:10.1007/JHEP11(2023)085

Abstract

We show that, in a $U (1)_{R - L}$ -symmetric supersymmetric model, the pseudo-Dirac bino and wino can give rise to three light neutrino masses through effective operators, generated at the messenger scale between a SUSY breaking hidden sector and the visible sector. The neutrino-bino/wino mixing follows a hybrid type I+III inverse seesaw pattern. The light neutrino masses are governed by the ratio of the $U (1)_{R - L}$ -breaking gravitino mass, $m_{3/2}$ , and the messenger scale $Λ_{M}$ . The charged component of the $S U (2)_{L}$ -triplet, here the lightest charginos, mix with the charged leptons and generate flavor-changing neutral currents at tree level. We find that resulting lepton flavor violating observables yield a lower bound on the messenger scale, $Λ_{M} ≳ (500 - 1000) TeV$ for a simplified hybrid mixing scenario. We identify interesting mixing structures for certain $U (1)_{R - L}$ -breaking singlino/tripletino Majorana masses. For example, in some parameter regimes, bino or wino has no mixing with the electron neutrino. We also describe the rich collider phenomenology expected in this neutrino-mass generation mechanism.

arXiv commentv2: 20 pages, 7 figures, plots updated, added clarifying comments, matches published version in JHEP

A Hybrid Type I + III Inverse Seesaw Mechanism in U(1)R−L​-symmetric MSSM

Abstract

References in corpus (21)

A Hybrid Type I + III Inverse Seesaw Mechanism in $U (1)_{R - L}$ -symmetric MSSM