Abstract
Recently, it was shown in K. Agashe et al. [Phys. Rev. D 94, 013001 (2016)] that a straightforward implementation of the type I seesaw mechanism in a warped extra dimensional framework is in reality a natural realization of “inverse” seesaw; i.e., the Standard Model (SM) neutrino mass is dominantly generated by exchange of pseudo-Dirac TeV-mass SM singlet neutrinos. By the correspondence, this scenario is dual to these singlet particles being composites of some new strong dynamics, along with the SM Higgs boson (and possibly the top quark), with the rest of the SM particles being mostly elementary. We study signals from production of these heavy neutrinos at the Large Hadron Collider (LHC). We focus on the scenario where the strong sector has a global symmetry; such a left-right (LR) structure being motivated by consistency with the electroweak (EW) precision tests. The singlet neutrinos are charged under symmetry, thus can be produced from exchange, as in four-dimensional LR symmetric models. However, the direct coupling of light quarks to is negligible, due to also being composite (cf. four-dimensional LR models); nonetheless, a sizable coupling can be induced by mixings among the various types of bosons. Furthermore, decays dominantly into the singlet and composite partner of charged lepton (cf. SM lepton itself in four-dimensional LR model). This heavy charged lepton, in turn, decays into SM lepton, plus , thus the latter can be used for extra identification of the signal. For a benchmark scenario with of mass 2 TeV and singlet neutrino of mass 750 GeV, we find that, in both the and channels, significant evidence can be seen at the 14 TeV LHC for an integrated luminosity of and that even discovery is possible with slightly more luminosity.
- Received 9 June 2017
DOI:https://doi.org/10.1103/PhysRevD.97.075032
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Published by the American Physical Society