Abstract
We study a simple left-right symmetric (LRS) extension of the Zee model for neutrino mass generation. An extra $SU(2)_{L/R}$ singlet charged scalar helps in generating a loop-induced Majorana mass for neutrinos in this model. The right-handed neutrinos in this case are very light of the order of a few eV to a few MeV which makes this scenario quite different from other LRS models. We have analyzed the scalar potential and Higgs spectrum in detail, which also play an important role for the neutrino phenomenology. We identified the parameter regions in the model which satisfy the experimentally observed neutrino masses and mixings along with other experimental constraints. We have then studied the collider signatures of the charged scalar at $e^+e^-$ colliders with different benchmark points. It is possible to get a huge enhancement in the production cross-section of the charged scalar at lepton collider compared to the hadron colliders, resulting in a much stronger signal which can be easily observed at the upcoming ILC or CLIC experiments.
Highlights
The observation of neutrino oscillation leading to the realization that neutrinos are massive is one of the biggest motivations for physics beyond the Standard Model (SM)
It is possible to get a huge enhancement in the production cross section of the charged scalar at a lepton collider compared to the hadron colliders, resulting in a much stronger signal, which can be observed at the upcoming International Linear Collider or Compact Linear Collider experiments
This is quite different from other left-right symmetric models in which the right-handed neutrino is naturally heavy as its mass is proportional to the righthanded symmetry breaking scale
Summary
The observation of neutrino oscillation leading to the realization that neutrinos are massive is one of the biggest motivations for physics beyond the Standard Model (SM). The Zee model [3] is one of the simplest such scenarios in which neutrino masses are generated at one loop by extending the SM scalar sector with an extra doublet and a charged singlet scalar field. The gauge structure of LRS framework naturally requires the existence of right-handed neutrinos, which can help generate light neutrino masses through the seesaw mechanism. The simplest LRS scenario, on the other hand, requires only an SUð2ÞR doublet scalar to achieve a consistent right-handed symmetry breaking but cannot generate light neutrino masses.. The LRS Zee model would be a prime candidate for explaining such a particle if these experimental results were to persist Another important consequence of light right-handed neutrinos is the enhanced cross section for the production of the SUð2ÞL=R singlet charged Higgs boson in this model, especially in the context of electron-positron colliders.
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