Neutrino masses from a pseudo-Dirac Bino

TL;DR

This paper proposes a novel mechanism within $U(1)_R$-symmetric supersymmetric models where the bino and singlino form a pseudo-Dirac pair that naturally generates neutrino masses and mixing, with potential LHC detectability.

Contribution

It introduces a new neutrino mass generation mechanism using bino and singlino as right-handed neutrinos without R-parity violation, and predicts observable collider signatures.

Findings

Neutrino masses and mixing are explained without traditional R-parity violation.

The bi$ u$o$ can be produced at the LHC via interactions with colored particles.

The model predicts a massless lightest neutrino.

Abstract

We show that, in $U(1)_R$-symmetric supersymmetric models, the bino and its Dirac partner (the singlino) can play the role of right-handed neutrinos and generate the neutrino masses and mixing, without the need for traditional bilinear or trilinear R-parity violating operators. The two particles form a pseudo-Dirac pair, the `bi$\nu$o'. An Inverse Seesaw texture is generated for the neutrino-bi$\nu$o sector, and the lightest neutrino is predicted to be massless. Unlike in most models with heavy right-handed neutrinos, the bi$\nu$o can be sizably produced at the LHC through its interactions with colored particles, while respecting low energy constraints from neutrinoless double-beta decay and charged lepton flavor violation.