The search for electroweak-scale right-handed neutrinos and mirror charged leptons through like-sign dilepton signals
Jun 27, 2016
14 pages
Published in:
- Phys.Rev.D 95 (2017) 1, 015014
- Published: Jan 20, 2017
e-Print:
- 1606.08502 [hep-ph]
View in:
Citations per year
Abstract: (APS)
The existence of tiny neutrino masses at a scale more than a million times smaller than the lightest charged fermion mass, namely the electron, and their mixings cannot be explained within the framework of the exceptionally successful standard model (SM). Several mechanisms were proposed to explain the tiny neutrino masses, most prominent among which is the so-called seesaw mechanism. Many models were built around this concept, one of which is the electroweak (EW)-scale νR model. In this model, right-handed neutrinos are fertile and their masses are connected to the electroweak scale ΛEW∼246 GeV. It is these two features that make the search for right-handed neutrinos at colliders such as the LHC feasible. The EW-scale νR model has new quarks and leptons of opposite chirality at the electroweak scale [for the same SM gauge symmetry SU(2)W×U(1)Y] compared to what we have for the standard model. With suitable modification of the Higgs sector, the EW-scale νR model satisfies the electroweak precision test and, also the constraints coming from the observed 125-GeV Higgs scalar. Since in this model, the mirror fermions are required to be in the EW scale, these can be produced at the LHC giving final states with a very low background from the SM. One such final state is the same sign dileptons with large missing pT for the events. In this work, we explore the constraint provided by the 8 TeV data, and prospect of observing this signal in the 13 TeV runs at the LHC. Additional signals will be the presence of displaced vertices depending on the smallness of the Yukawa couplings of the mirror leptons with the ordinary leptons and the singlet Higgs present in the model. Of particular importance to the EW-scale νR model is the production of νR which will be a direct test of the seesaw mechanism at collider energies.Note:
- 13 figures. arXiv admin note: text overlap with arXiv:1508.07318
- mirror: model
- model: left-right
- neutrino: mass
- neutrino: mass generation
- neutrino: right-handed
- lepton: mirror particle
- coupling: Yukawa
- symmetry: gauge
- seesaw model
- Higgs particle: doublet
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Figures(13)
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